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A tractor can plough an acre of Kenyan maize land in about an hour and a half. By hand, it takes a farmer nearly a week. Few smallholders can afford to buy a tractor, so they rent one. The tractor’s owner often lives in town, and employs an operator to drive the tractor to the fields and do business. To minimise risk, the owner keeps their tractor close to home, even when the best work is far away. Sophie Nottmeyer studied what changed when owners could observe exactly where the tractor was. She used GPS records from about 1,200 tractors fitted with a tracking app from the start-up Hello Tractor, covering close to a million fields, and satellite images of the land they worked. As owners learned to use the app, their tractors travelled further, finding better business opportunities. A year after adoption, they worked about 55 km further from home than in their first month. Nottmeyer presented the research at STEG's sixth Annual Conference in Nairobi in January 2026. She tells Tim Phillips what satellites reveal about the fields the tractors reached, and why a fuel subsidy that did the same job would cost hundreds of times more. The research behind this episodeNottmeyer, Sophie. 2025. "Trac(k)tors of Change: Monitoring, Tractor Mobility and Agricultural Mechanization in Kenya." Working paper, November 2025. A summary is available as a STEG policy brief: "Following the tracks: how digital monitoring expands access to agricultural mechanisation across space" (2026). To cite this episodePhillips, Tim, and Sophie Nottmeyer. 2026. "Tracking Kenya's tractors." Conversations on Transformation (podcast). About the guestSophie Nottmeyer is a Research Economist in the Directorate General of Economic Research at Banco de Mexico. She was previously a Postdoctoral Researcher at Universitat Pompeu Fabra in Barcelona, and holds a PhD in Economics from CEMFI in Madrid. Her research spans market access, organisational frictions and informal institutions, and how they interact with geography and climate. She has also worked with remote-sensing scientists to estimate maize yields in Kenya from satellite data. Research cited in this episodeHello Tractor is an agricultural technology company based in Nairobi. In 2018 it introduced a GPS tracking device for tractors, fitted by a mechanic, with a mobile and web app that shows owners where their tractor is in real time. The app reports how many jobs the tractor did, how many acres it worked, how long it ran and how far it drove, and it can replay the tractor's exact path across a field. In 2023 owners paid US$125 to install the device and US$60 a year to use the app. Nottmeyer's data cover every job done by tractors that adopted it between 2018 and 2025, about 917,000 in total. Moral hazard arises when one party cannot observe what another does on its behalf. Kenyan tractor owners hire operators, who are often paid from the revenue they collect. Because the owner cannot see how many acres were ploughed, an operator can under-report jobs, take unauthorised work or use fuel for other purposes. Owners respond with surprise visits, fuel checks and rules that the tractor must come home every night. All of these work only if the tractor stays nearby. The problem is sharper because many owners are not farmers at all; according to Kenya's 2019 census, 33% of tractor owners live in cities. Misallocation describes an economy in which capital or labour does not go where it would produce the most. Chang-Tai Hsieh and Peter Klenow showed in "Misallocation and Manufacturing TFP in China and India" (Quarterly Journal of Economics, 2009) how large the cost of such gaps can be. Nottmeyer measures misallocation as the spread in the returns that tractors earn in different places. If a tractor would earn more in a distant district than near home, but never goes there, the economy loses output. Counting Kenya's tractors is harder than it sounds. No official source records tractor ownership or use, Kenya's last nationwide agricultural census was in 1979, and the Food and Agriculture Organization stopped publishing its global series on agricultural machinery in 2009. The roughly 1,225 tractors in Nottmeyer's data represent between 1.73% of the tractors counted by the 2019 census and 8.75% of the last FAO figure, from 2008. Comparing each tractor with itself is how Nottmeyer deals with the lack of a control group. The data begin only when a tractor adopts the app, so she uses each tractor's first month as its baseline, on the assumption that owners take time to trust the information and change how they manage operators. The average distance from home was 70 km in that first month. It rose by about 30 km after six months, 55 km after one year and 112 km after two years. The pattern is similar for early and late adopters, for older tractors whose owners had run them before fitting the device, and for tractors that return home every night. Nottmeyer does not claim these estimates are strictly causal, but the alternative explanations she tests do not account for the pattern. Satellite measures of crop growth stand in for yields, which nobody records at field level in Kenya. Nottmeyer uses Sentinel-2 images from the European Union's Copernicus programme to calculate the Normalized Difference Vegetation Index (NDVI), which measures how green and dense vegetation is. Ploughing leaves a field bare at the start of the season, so the gap between the lowest and highest NDVI in a year captures both land preparation and crop growth. She matches 33,256 fields worked by monitored tractors with similar fields nearby. In the year of the visit, the gap rises by about 0.4 standard deviations more in the visited fields, and part of the gain persists in later years. Because some of the comparison fields may also have been ploughed by other tractors, this is a lower bound on what mechanisation does. A spatial model of tractor location turns these results into national figures. Owners choose where to send a tractor by weighing the returns in each place against the cost of distance, and monitoring lowers that cost. When all Hello Tractor tractors behave as if they had five years of experience with the app, the spread of returns across places falls by 15.9% and total output rises by 2.18%, compared with tractors that have just adopted it. If every tractor in Kenya had the technology, output would rise by 1.3%. A fuel subsidy is the obvious alternative policy, because it makes long trips cheaper. Nottmeyer calculates that to achieve the same gains, a subsidy would have to cover almost all the fuel a tractor uses per kilometre, at a total cost of about US$9.33 billion. Fitting all 70,930 tractors in the 2019 census with the device and a five-year subscription would cost about US$30.1 million. Monitoring in other industries follows the same logic wherever an owner hands a vehicle to someone else to operate. Thomas Hubbard's "The Demand for Monitoring Technologies: The Case of Trucking" (Quarterly Journal of Economics, 2000) studied the onboard computers that US trucking firms installed to track drivers. Erin Kelley, Gregory Lane and David Schonholzer ran an experiment with Nairobi's minibus owners, reported in "Monitoring in Small Firms: Experimental Evidence from Kenyan Public Transit" (American Economic Review, 2024), and found that tracking devices helped owners manage drivers and raised profits. More Conversations on Transformation episodesMoving to profitability. Carolyn Pelnik asks why street vendors and motorcycle taxi drivers in Kampala stay in less profitable parts of the city, another case in which mobile workers and assets do not go where they would earn most. Slack and economic development. Felix Samy Soliman explains why firms in Kenya leave labour and capital idle, and how much growth that unused capacity could deliver. Further readingMisallocation and Product Choice, a STEG working paper by Stepan Gordeev and Sudhir Singh, uses farm and crop data from India to estimate how much output is lost when inputs are spread unevenly between farms, and shows that the answer depends on which crops farmers can choose to grow. Tillers of Prosperity: Land Ownership, Reallocation, and Structural Transformation, a STEG working paper by Shuhei Kitamura, finds that when the land reform enforced by the Allies after the Second World War gave tenants ownership of their farms, they adopted low-cost farm technology, relied less on family labour, and more young people left for the cities.

Nearly every child in a low- or middle-income country now goes to school, but about 70% of 10-year-olds still cannot read or understand a simple text. Researchers have tested ways to fix the problem, and governments want them to work. So why has the needle not moved? Noam Angrist (Oxford) and nine co-authors argue that the missing piece is the study of implementation itself. In this week's VoxDev Talk, Tim Phillips asks Noam about their framework, just published in Science, that sets out how small tightly controlled experiments can scale to large real-world trials, then into government policy and finally into classrooms.  As Noam describes, it's not easy to convert good intentions and a clear need to real change. Listen to this week's episode to find out why. The research behind this episode: Angrist, Noam, Tahir Andrabi, Stefan Dercon, Sharnic Djaker, James Habyarimana, Michelle Kaffenberger, Clare Leaver, Akshay Mangla, Nompumelelo Mohohlwane, and Abhijeet Singh. 2026. "An Agenda for Implementation Science in Education." Science 393 (6816): 1084-87. To cite this episode: Phillips, Tim, and Noam Angrist. 2026. "Implementation science in education: Scaling what works." VoxDev Talks (podcast). About the guestNoam Angrist is Academic Director of the What Works Hub for Global Education and a Senior Research Fellow at the Blavatnik School of Government, University of Oxford. He co-founded Youth Impact, an NGO headquartered in Botswana that scales and tests health and education programmes. His research spans the scale-up and implementation of education programmes, global learning data, and A/B testing in the social sector. He led key parts of the education pillar of the World Bank Human Capital Index. Research cited in this episodeLearning poverty. A World Bank measure: the share of children who cannot read and understand a simple text by age 10. A 2022 report by the World Bank, UNESCO, UNICEF, FCDO, USAID and the Gates Foundation estimated it at about 70% in low- and middle-income countries, up from 57% before the pandemic. It is the gap between schooling and learning in a single number. Structured pedagogy and teaching at the right level. Two of the approaches with the strongest evidence for improving learning cheaply. Structured pedagogy gives teachers detailed lesson plans, materials and coaching. Teaching at the right level groups children by what they can do, not by their age or grade. The Global Education Evidence Advisory Panel reviews this evidence for cost-effectiveness; Angrist led the research behind its first report. The economist as plumber. Esther Duflo's 2017 Richard T. Ely Lecture to the American Economic Association. She argued that economists who help governments design policy must work on the details of implementation, tinkering and adjusting as plumbers do. Duflo, Esther. 2017. "The Economist as Plumber." American Economic Review 107 (5): 1-26. The voltage effect. John List's term for the drop in impact when a programme that worked in a pilot is expanded. List, John A. 2022. The Voltage Effect: How to Make Good Ideas Great and Great Ideas Scale. New York: Currency. The What Works Hub for Global Education. A research centre based at the Blavatnik School of Government, funded initially by the UK Foreign, Commonwealth and Development Office and the Gates Foundation. It studies how proven education programmes can be implemented and sustained at scale. More at wwhge.org. Efficacy and effectiveness trials. Terms borrowed from health research. An efficacy trial asks whether something can work under controlled conditions. An effectiveness trial asks whether it works in the real world: at scale, delivered by government, at a cost governments can pay, and for different groups of children. Most education evidence today comes from efficacy trials. Adaptive trials and A/B testing. Instead of one large, static experiment, researchers run many small randomised tests, change the programme between rounds, and test again. Angrist's shorthand is three Rs: rigorous, as in a standard randomised trial, but also rapid and regular. Using data already in government systems keeps the cost of each round low. How research affects policy. An experiment with 2,150 Brazilian municipalities found that mayors will pay to learn research results, and that telling them about evidence on tax reminder letters made adoption of the policy more likely. Angrist cites it as an example of studying evidence uptake directly. Hjort, Jonas, Diana Moreira, Gautam Rao, and Juan Francisco Santini. 2021. "How Research Affects Policy: Experimental Evidence from 2,150 Brazilian Municipalities." American Economic Review 111 (5): 1442-80. Angrist also describes a forthcoming experiment in Bangladesh that showed policymakers different kinds of evidence; early results suggest global causal evidence carries more weight than many assume. Second-best policy. If the best policy is politically impossible, a workable alternative that still improves learning may be the better target. Angrist credits Stefan Dercon and Lant Pritchett with making this case. Part of the problem is visibility; a new school is easy to point at, and learning is rarely measured clearly. Outcomes funding. Funders pay providers for measured results, such as learning gains, rather than for inputs. The What Works Hub is studying two schemes: the Ghana Education Outcomes Project and the Sierra Leone Education Innovation Challenge, an $18 million programme across 325 schools from 2022 to 2025. The policy-practice gap. During COVID-19, governments adopted radio, television and phone-based teaching. Angrist and Dercon matched government policy data to household surveys to see who received it. Angrist says nearly all governments adopted new distance education policies, but just over 20% of households in Sub-Saharan Africa and about half in the Middle East and North Africa received them. Latin America did far better. Angrist, Noam, and Stefan Dercon. 2024. "Mind the Gap between Education Policy and Practice." Nature Human Behaviour 8 (12): 2261-63. Difference-in-differences at scale. Once a programme reaches every school, there is no control group for a randomised trial. Difference-in-differences compares changes over time between groups. Comparing districts or schools that did and did not get a programme does not work after a national rollout; comparing a cohort that received it with an earlier cohort that did not still does. Angrist says a recent review he worked on found more than 65% of such studies in education use the location design. Tusome. Kenya's national literacy programme, a structured pedagogy approach scaled to every public primary school from 2015. It improved learning at scale, but its effects did not last as many hoped. Piper, Benjamin, et al. 2018. "Scaling Up Successfully: Lessons from Kenya's Tusome National Literacy Program." Journal of Educational Change 19 (3): 293-321. Teaching at the right level in Uttar Pradesh. The approach, developed by the Indian NGO Pratham, was refined over years of randomised trials before government scale-up. Angrist says the Uttar Pradesh rollout reached more than five million children in over 100,000 schools, and that a new quasi-experimental evaluation finds it worked. The earlier scale-up trials: Banerjee, Abhijit, Rukmini Banerji, James Berry, Esther Duflo, Harini Kannan, Shobhini Mukerji, Marc Shotland, and Michael Walton. 2017. "From Proof of Concept to Scalable Policies: Challenges and Solutions, with an Application." Journal of Economic Perspectives 31 (4): 73-102. More VoxDev Talks episodesThe gap between education policy and practice. Angrist's previous visit, on the COVID-19 data behind the policy-practice gap. Schools are failing to deliver learning. Lant Pritchett on why schooling is not education, the conversation Tim refers to at the start of this episode. Increasing learning at scale in Ghana. Adrienne Lucas on testing four learning programmes at scale with the Ghanaian government. Related reading on VoxDevImplementation matters: Measure it and account for it. Noam Angrist and Rafe Meager show that implementation explains most of the variation in the effects of targeted instruction across studies. Educating children in emergencies: Global evidence from five randomised trials. Evidence on low-cost phone tutoring tested across five countries.

In many cities in low-income countries, the grid fails often enough that businesses keep a diesel generator out the back. So an unreliable electricity grid looks like it is holding poor economies back. In many countries, lenders are putting money behind that idea. But Martin Shu and his co-authors, Jonathan Colmer and David Lagakos, set out to test it. They assembled data on power plants, fuel, workers and imported generators in 89 countries, and measured how productive each electricity sector was. In the poorest countries, electricity was about three-quarters as productive as in the US — in other words, much closer tot he frontier than their economies. And in the economic model they built using their data, bringing every country up to the world frontier adds only about 1% to long-run GDP. Shu presented the research at STEG's sixth Annual Conference in Nairobi in January 2026. He tells Tim Phillips where the productivity gap in electricity lies, why a shoe factory that is better at left shoes than right shoes explains the small gains, and which part of the economy is the real bottleneck. The research behind this episodeColmer, Jonathan, David Lagakos, and Martin Shu. 2026. "Is the Electricity Sector a Weak Link in Development?" Working paper, January 2026 version presented at the STEG Annual Conference, Nairobi. An earlier version appeared as NBER Working Paper 32041 (2024). To cite this episodePhillips, Tim, and Martin Shu. 2026. "Is electricity a weak link in development?" Conversations on Transformation (podcast). About the guestMartin Shu is Assistant Professor of Economics at the School of Management and Economics and the Shenzhen Finance Institute of the Chinese University of Hong Kong, Shenzhen. His research spans macroeconomics, development and labour economics, including what household and firm data reveal about structural transformation, and why children in poor countries are more likely to follow their parents into the same occupation. He holds a PhD in Economics from Boston University and bachelor's and master's degrees from the Hong Kong University of Science and Technology. Research cited in this episodeWeak links are sectors whose problems hold back the whole economy. When inputs are strong complements, output depends heavily on the least productive link in the chain, so a small sector can matter far more than its size suggests. The idea draws on Albert Hirschman's The Strategy of Economic Development (1958), and Charles Jones formalised it in "Intermediate Goods and Weak Links in the Theory of Economic Development" (American Economic Journal: Macroeconomics, 2011), which uses electricity as a motivating example. Shu and his co-authors ask whether electricity fits that description in poor countries today. Total factor productivity (TFP) measures how much output an economy or a sector gets from its inputs. If two countries have the same capital and the same number of workers, but one produces more, it has higher TFP. Shu measures each country against the United States. The figures for whole economies come from the Penn World Table, hosted by the Groningen Growth and Development Centre and described by Robert Feenstra, Robert Inklaar and Marcel Timmer in "The Next Generation of the Penn World Table" (American Economic Review, 2015). The paper uses version 9.1; the current release, PWT 11.0, is supported by STEG. Agriculture's productivity gap is the comparison Shu uses to show why measuring TFP is not enough. Farming in poor countries is far less productive than the rest of the economy, as Francesco Caselli ("Accounting for Cross-Country Income Differences," Handbook of Economic Growth, 2005) and Diego Restuccia, Dennis Tao Yang and Xiaodong Zhu ("Agriculture and Aggregate Productivity: A Quantitative Cross-Country Analysis," Journal of Monetary Economics, 2008) document. Farmers are also the majority of workers in many developing countries. Yet few economists call agriculture a weak link. Whether a sector is a bottleneck depends on how it connects to the rest of the economy, and answering that needs a model as well as data. The electricity data combine several sources. Generating capacity comes from S&P Global Platts' World Electric Power Plants database, which lists more than 200,000 plants; the authors use generating capacity alone because it tracks transmission and distribution capacity closely. Power output and fuel use come from the International Energy Agency, and employment from national statistics offices. To count power from private generators, the authors use imports of generators recorded in the UN Comtrade database, an approach inspired by Francesco Caselli and Daniel Wilson ("Importing Technology," Journal of Monetary Economics, 2004). It works because few poor countries make their own generators. On the authors' conservative measure, generators supply about 7.6% of capacity on average. Labour's share of revenue in electricity is about 7%, in rich and poor countries alike. The authors collected annual reports, financial statements and SEC filings for 69 privately owned electricity companies in 31 countries, choosing private firms because their decisions follow profit rather than government mandate. Labour's share shows no relationship with GDP per capita. A share that does not change with income points to a Cobb-Douglas production function, in which each input's share of costs stays constant, and that simplifies the TFP calculation. Transmission and distribution losses are power that leaves a plant but never reaches a customer, lost as heat in wires and transformers, or stolen. According to IEA data, they average 14% of output across the sample, 22% in the poorest quarter of countries and 7% in the richest. They are the strongest predictor of low electricity TFP; once they are taken into account, the link between electricity TFP and national income largely disappears. Shu points to upgraded transformers close to end users, and ultra-high-voltage transmission lines, as the investments that would close the gap. Complementarity describes inputs that work together and cannot easily replace each other, like left and right shoes. The model sets the elasticity of substitution between electricity and everything else at 0.2, following Ernst Berndt and David Wood ("Technology, Prices, and the Derived Demand for Energy," Review of Economics and Statistics, 1975). Strong complementarity sounds as if it should make electricity more important. Shu's shoe factory shows why it does not: when a sector is already efficient, making it more efficient frees few resources, and output still waits on the less productive partner. Hulten's theorem, from Charles Hulten's "Growth Accounting with Intermediate Inputs" (Review of Economic Studies, 1978), predicts the economy-wide gain from a productivity improvement in one sector: multiply the improvement by the sector's Domar weight, its sales as a share of GDP. The authors treat any gain above that prediction as the sign of a weak link. Raising electricity TFP to the world frontier, defined as the 90th percentile, means an average increase of 43%, and by Hulten's rule it would add 1.7% to GDP. The model delivers about 1%, and only six countries beat the benchmark. The biggest exceptions are Ethiopia and Kenya, where frequent outages make power expensive or halt production. The authors also test their results against David Baqaee and Hannes Malmberg's "Long-Run Comparative Statics" (NBER Working Paper 33504, 2025), which extends Hulten's approach to allow for capital accumulation. Raising productivity outside electricity is the counterpart experiment. When the authors raise TFP in the rest of the economy by the same proportion instead, every country gains more than Hulten's theorem predicts, and the capital stock grows by 75% on average. Shu's conclusion is about balance. With complementary sectors, pushing one to an extreme achieves little, and today it is the non-electricity sector that lags. More Conversations on Transformation episodesA Microeconomic Perspective on Misallocation. Eric Verhoogen explains how economists diagnose the wedges that keep resources from their best use, the same kind of distortion Shu's model uses to capture outages and costly self-generated power. Structural change in sub-Saharan Africa. Gaaitzen de Vries and Kei-Mu Yi ask whether African economies follow the familiar path of structural transformation, a wider view of the sectors that Shu argues are holding growth back. Further readingCan Mass Electrification (Still) Cause Structural Change?, a STEG synthesis paper by Eric Hsu and Mitchell VanVuren, reviews the mixed evidence on whether connecting people to power still raises productivity and incomes in low- and middle-income countries, as it appears to have done in the past. Under the Grid: Price and Informational Barriers to Grid Densification in Benin, a STEG working paper by Arnaud Dakpogan, Megan Lang and Alpha Ly, finds that a connection subsidy did not raise formal connection rates on average, but information on costs and procedures nearly doubled them among households with no connection at all.

King Leopold II of Belgium told his envoy in London that he did not want to lose his slice of "this magnificent African cake". The cake was the Congo Free State. Today the Democratic Republic of Congo holds 70% of the world's cobalt reserves, and so the cake is back on the table. Christopher Adam (Oxford) is one of the editors of a special issue of the Oxford Review of Economic Policy on the new scramble for critical minerals. The minerals lie mostly in the Global South, and the demand comes mostly from the North. In this week's VoxDev talk, Chris explains why a mining boom may create few jobs, why it might not last, and why hiring the best lawyers could be the smartest way to use an aid budget. The research behind this episode: Adam, Christopher, Rabah Arezki, and Frederick van der Ploeg. 2026. "The scramble for critical minerals." Oxford Review of Economic Policy 42 (1): 1-13. Open access. The introduction to Volume 42, Issue 1, a special issue on critical minerals. To cite this episode: Phillips, Tim, and Christopher Adam. 2026. "The critical minerals scramble.” VoxDev Talks (podcast). About the guestChristopher Adam is Professor of Development Economics at the Oxford Department of International Development, University of Oxford. He is managing editor of the Oxford Review of Economic Policy, an associate editor of the Journal of Development Economics, a Lead Academic for the International Growth Centre, and a Visiting Scholar at the International Monetary Fund. His research spans the macroeconomics of low-income countries, monetary economics and public finance, and growth and structural change, including the response to climate change and natural disasters. Research cited in this episodeLeopold II and the "magnificent African cake". The opening quotes a letter from King Leopold II of Belgium to his envoy in London, in the English translation used by Adam Hochschild in King Leopold's Ghost (Houghton Mifflin, 1998). Leopold went on to rule the Congo Free State as a personal possession. Chris uses the comparison to ask whether today's scramble will end any better for the people who live on top of the minerals. What makes a mineral critical. There is no single list. The usual working definition, from the US National Research Council (2008), is that a mineral must be both essential to a modern technology and subject to supply chain risk. In the same special issue, geologist Jon Blundy compares the critical mineral lists of 12 countries and finds that only lithium and the rare earths appear on all of them. Demand to 2040. The International Energy Agency (IEA 2021) projects that demand for minerals for clean energy technologies will rise at least fourfold by 2040 if the world meets its climate goals. Chris adds two further sources of demand, digital infrastructure and defence. China's grip on processing. Mining is spread across many countries; refining is not. China controls between 60% and 80% of final global supply of processed critical minerals (Leruth et al. 2022, cited in the paper). Chris argues this concentration is what makes the current scramble different from the earlier one for oil and gas. The presource curse. A term from World Bank economist James Cust and David Mihalyi (IMF 2017). Governments and citizens start spending in anticipation of a resource boom, before any revenue arrives, and growth can fall as a result. Chris warns against the same over-exuberance about local processing of critical minerals. Battery substitution. Lithium-ion batteries dominate today, but sodium-based alternatives are in development (Vu 2025, cited in the paper). High prices raise the incentive to find substitutes, so a producer country cannot assume today's price will hold. Take-or-pay contracts. In a take-or-pay contract, the buyer pays for a minimum quantity of output whether or not it takes delivery. The paper proposes such long-term contracts, used in natural gas, as one way to share the risk of technological change between mining companies and producer governments. Taxing value that sits downstream. In the special issue, Gregoire Rota-Graziosi argues that the rent from critical minerals is moving away from the mine and towards processing plants and intangible assets. His proposals include anchoring prices to international benchmarks to limit transfer pricing abuse. Chris stresses the role of royalties. Indonesia's nickel export ban. Indonesia banned exports of raw nickel ore from 2020. It is now the world's leading nickel producer and processor, but the paper notes that the main impetus came from Chinese firms and investment in industrial parks. Chris raises it as a success with a caveat. The double dividend. In the special issue, Mathieu Couttenier and Dominic Rohner argue that the green transition could reduce conflict as well as emissions, if governance, transparency and multilateral institutions are strong enough. Chris says he would like to share their optimism. Dutch disease. A resource boom drives up the real exchange rate and makes other exports less competitive (Eastwood and Venables 1982). Because mining creates few jobs, Chris argues that industrial policy beyond the mining sector must address this risk directly. More VoxDev Talks episodesNo taxation without administration: What makes tax authorities work. Royalties and transfer pricing rules are only as good as the tax authority that enforces them. Rethinking development cooperation: The case for a 'balance sheet' approach. A proposal to treat low and middle-income countries as managers of their own assets, which is the position a mineral-rich government is in. Related reading on VoxDevMining booms move workers from farms to services, not factories, by Qing Huang, Victoria Wenxin Xie and Wei You. Evidence from 33,262 mines on what resource booms do to local employment. Who owns the mine matters for deforestation, by Victoria Wenxin Xie, Wei You and Ran Goldblatt. Mineral price booms increase deforestation near mines, and investor origin changes the size of the effect. The downstream impacts of mines: How pollution hits agriculture, by Lukas Vashold, Gustav Pirich, Maximilian Heinze and Nikolas Kuschnig. In Africa, crops are less healthy downstream of mining sites.

This is an episode from VoxDev's new podcast series, Ideas in Development. This series has a separate podcast feed, where you can find every episode of Oliver Hanney’s conversations on evidence. YouTube: https://www.youtube.com/watch?v=R8eCnQy5fF4 Apple Podcasts: https://podcasts.apple.com/us/podcast/givedirectlys-quest-for-scale/id1866874059?i=1000791048981 Spotify: https://open.spotify.com/episode/2ffbhYkt9bYNiWUc5KPIuZ?si=13787b330c604508 Audioboom: https://audioboom.com/posts/8955404-givedirectly-s-quest-for-scale  GiveDirectly started out as a small nimble team founded by PhD economists, who had a novel approach to ending poverty – just give cash. But they are no longer the new kids on the block, and have been scaling their operations rapidly in recent years, a trend that could intensify if the third wave of American philanthropy materialises. That’s a huge opportunity, but the potential of operating across entire countries is a radically different proposition. So what does an evidence-driven organisation research when it's trying to go from moving millions a year to billions? Caitlin Tulloch, Senior Director for Research, Learning and Product at GiveDirectly, joins Oliver Hanney for a wide-ranging conversation on cash transfers at scale. We cover running a research portfolio like the treasury, the macro forecasting work around a new Malawi project, the trade-off between fraud and reach, building a global emergency response capability, and the politics of putting a lot of cash into someone else's economy. Ideas in Development is a VoxDev podcast on economic policy and research. Find us wherever you get your podcasts, and read the full write-up on our Substack: https://ideasindevelopment.substack.com/

Medicine has run rigorous clinical trials since the 1940s. Development economists borrowed the structure of the trials during the credibility revolution. Chris Cotton (Queen's University) argues that they misunderstood an important part of this revolution. One successful study is not a mature evidence base, and policies built on too little evidence tend to disappoint at scale.  His answer is a framework of Policy Evidence Readiness Levels, or PERLs, just published in Science. PERLs 1 through 4 categorise the weight of evidence behind an intervention, and are inspired by the scale NASA uses to judge whether a technology is ready for a space mission. He tells Tim Phillips which development programmes have already climbed to the top rung, which were implemented at scale on too little evidence (and what happened when they were), and why his framework, by his own admission, is still a modest PERL level 1. The research behind this episodeCotton, Christopher. 2026. "Rigor Is Not Readiness: The PERL Framework for Evidence-Based Policy." Science 393 (6810): 463-465. To cite this episodePhillips, Tim, and Christopher Cotton. 2026. "Evidence-based policy: Why one good trial isn't enough." VoxDev Talks (podcast).About the guestChristopher Cotton is Professor of Economics at Queen's University in Kingston, Ontario, where he holds the Jarislowsky-Deutsch Chair in Economic and Financial Policy and directs the John Deutsch Institute for the Study of Economic Policy. He is cross-appointed to the School of Policy Studies and the Department of Medicine. His research spans evidence-based policy, the economics of science, education and public health, and how organisations use expertise when they make decisions. He is a co-owner of and research adviser at Limestone Analytics, a policy advisory firm, and has advised on impact evaluation and evidence-based policy for the UK and US governments, the World Health Organization, and others. Research cited in this episodeEvidence-based medicine. The movement that took hold in the 1990s, decades after the clinical trial became standard. Its classic statement is Sackett, David L., William M. C. Rosenberg, J. A. Muir Gray, R. Brian Haynes, and W. Scott Richardson. 1996. "Evidence Based Medicine: What It Is and What It Isn't." BMJ 312 (7023): 71-72. It set out how clinicians should combine the best research evidence with clinical judgement. Cotton's point is that medicine's evidence hierarchy puts systematic reviews above any single trial; the social sciences adopted the trials but not the hierarchy. Technology Readiness Levels. NASA's nine-level scale for the maturity of a technology, from basic principles observed (TRL 1) to flight proven on a successful mission (TRL 9). It gives engineers a shared vocabulary for readiness without dictating how each component is tested. PERLs borrow the idea and apply it to claims about policy. The four PERLs. PERL 1 is a hypothesis, backed by theory or observational data. PERL 2 is efficacy, shown in controlled trials under favourable conditions. PERL 3 is targeted adoption, with at least one rigorous causal evaluation under real-world implementation. PERL 4 is generalised guidance, built on systematic reviews that address how effects vary across contexts. Cotton's examples of PERL 4 evidence in development include insecticide-treated bed nets for malaria, cash transfers for school enrolment, and iron and folic acid supplements for pregnant women. The science of scaling. A growing literature on why promising pilots disappoint at scale; Cotton cites Rasul, Imran. 2026. "From Field Experiments to Policy Interventions at Scale." Science 391 (6790). Much of this work asks researchers to test programmes under real-world conditions. In PERL terms, that moves evidence from level two to level three; Cotton argues it is necessary but not sufficient. Evidence synthesis organisations. Cochrane produces systematic reviews in health; the Campbell Collaboration does the same for social policy; 3ie, the International Initiative for Impact Evaluation, funds and synthesises impact evaluations in development. Together with J-PAL's evidence reviews and WHO guidelines, Cotton identifies them as where PERL 4 evidence lives. Microcredit. Cotton's main cautionary tale. Early pilots produced promising causal evidence under specific conditions, and donors, NGOs, and the media turned it into a claim that microcredit would transform global poverty. The later randomised evidence is summarised in Banerjee, Abhijit, Dean Karlan, and Jonathan Zinman. 2015. "Six Randomized Evaluations of Microcredit: Introduction and Further Steps." American Economic Journal: Applied Economics 7 (1): 1-21. Across six countries, the studies found some increase in business activity but no evidence of a reduction in poverty. The graduation approach. A package of a productive asset, training, coaching, savings, and consumption support for ultra-poor households, first developed by the Bangladeshi NGO BRAC in 2002. The landmark multi-country study is Banerjee, Abhijit, Esther Duflo, Nathanael Goldberg, Dean Karlan, Robert Osei, William Parienté, Jeremy Shapiro, Bram Thuysbaert, and Christopher Udry. 2015. "A Multifaceted Program Causes Lasting Progress for the Very Poor: Evidence from Six Countries." Science 348 (6236): 1260799. J-PAL's Policy Insight now draws on 20 randomised evaluations. Cotton uses it as an example of evidence that matured as implementation expanded. The reading wars. Cotton's example from outside development. Many education systems adopted whole-language and three-cueing approaches to reading, based on appealing theory and small, heavily resourced studies, and pushed phonics aside. The evidence is reviewed in Castles, Anne, Kathleen Rastle, and Kate Nation. 2018. "Ending the Reading Wars: Reading Acquisition from Novice to Expert." Psychological Science in the Public Interest 19 (1): 5-51. Quasi-experimental methods. Techniques such as difference-in-differences, which compare changes over time between places or groups that did and did not receive a policy. Cotton argues that macro policies and institutional reforms, which cannot be randomised, can still climb to PERL 3 and even PERL 4 by combining such studies with well-tested theory and the historical record. More VoxDev Talks episodesHow do policymakers interpret different types of evidence? Eva Vivalt on how policymakers update their beliefs when they see new evidence, and the biases that get in the way. Rethinking evidence and refocusing on growth in development economics. Lant Pritchett makes the sceptic's case against relying on RCTs and systematic reviews as the main guide to policy. How AI can put 20 years of development evidence to work. Iqbal Dhaliwal of J-PAL on building AI programmes on the existing evidence base, and the scaling problems AI inherits. Related reading on VoxDev.orgScaling policy ideas in developing countries, in which John List argues that researchers should generate policy-based evidence before decision-makers commit to scale. Insights from first generation of microcredit RCTs, from the VoxDevLit on microfinance, which reviews seven randomised evaluations of microcredit programmes.

In Uganda, every sale between two VAT-registered firms reaches the tax authority twice. The seller reports it, and so does the buyer. But the two numbers rarely match. In Turkiye, a supplier that installs its first industrial robot doesn’t make an announcement, but the administrative records can track when the firms automate, and what happens next. Justine Knebelmann and Nuriye Melisa Bilgin tell Tim Phillips how they used those records to find out more about the choices firms make, and the effects on the firms around them. Justine and her co-authors worked with the Uganda Revenue Authority to send letters to firms whose reports did not match their trading partner’s, to find out under what conditions the firms amended their tax returns. Nuriye mapped robot adoption across Turkiye's firm-to-firm network, to find out the competitive effects. They also discuss how researchers can access administrative data, and how simply compiling it can change policy. The research behind this episode: Almunia, Miguel, David J. Henning, Justine Knebelmann, Dorothy Nakyambadde, and Lin Tian. 2023. "Firm Networks and Tax Compliance: Experimental Evidence from Uganda." CEPR Discussion Paper 18151, revised October 2025.  Bilgin, Nuriye Melisa, Ester Faia, and Gianmarco Ottaviano. 2024. "Technology Spillovers, Diffusion and Rivalry in Firm Networks." CEPR Discussion Paper 19804.  To cite this episode: Phillips, Tim, Justine Knebelmann, and Nuriye Melisa Bilgin. 2026. "Follow the paper trail." PEDL (podcast). Centre for Economic Policy Research. About the guestsJustine Knebelmann is an Assistant Professor in the Department of Economics at Sciences Po, Paris, and an Associate at the Institute for Fiscal Studies. Her research spans state capacity in developing countries, tax administration, digitalisation and land. She has worked with tax administrations in Sub-Saharan Africa since 2015. Nuriye Melisa Bilgin is a Lecturer in Economics at Koç University and a Senior Fellow at the Microsoft AI Economy Institute. Her research spans technology adoption, from industrial robots to generative AI, and how new technologies and shocks travel through production networks and global value chains, using large-scale firm-to-firm transaction data from Turkiye. She held postdoctoral positions at Bocconi University and the University of Turin. About PEDLPrivate Enterprise Development in Low Income Countries (PEDL) is a joint research initiative of the Centre for Economic Policy Research (CEPR) and the Foreign, Commonwealth & Development Office (FCDO), and part of CEPR's Growth Research Platform. Established in 2011, it funds research on private-sector development in low-income countries. Find out more at grp.cepr.org/pedl. Research cited in this episodeValue-added tax (VAT). Firms charge VAT on their sales and reclaim the VAT they paid on inputs bought from other registered firms. Because every business-to-business sale appears on two returns, one from each side, the tax authority can in principle check one report against the other. Economists call this the VAT's self-enforcing property. In Uganda the VAT raises about 30% of total tax revenue, according to IMF figures cited by Almunia and co-authors; the IMF puts Uganda's VAT compliance gap at around 60% of potential VAT revenue. Seller shortfall. The Uganda team's term for a transaction in which the seller reports a smaller amount than the buyer. It lowers the tax bill and often signals evasion. In the 10 months before the experiment, from March to December 2017, seller shortfall appeared in 41.4% of monthly seller-buyer observations, and in more than 92% of those cases the seller had not reported the transaction at all. Almunia, Hjort, Knebelmann and Tian (2024). "Strategic or Confused Firms? Evidence from 'Missing' Transactions in Uganda," Review of Economics and Statistics 106 (1): 256-265. This earlier study measured the scale of the problem. Sellers and buyers reported different amounts for the same transactions 79% of the time, and the authors estimate that unilateral misreporting cost Uganda about USD 383 million in VAT revenue between 2013 and 2016. Randomising pairs, not firms. In a dense trading network, a letter sent to one firm can reach its partners by several routes and blur the results. The Uganda team randomised at the level of the seller-buyer pair instead, and selected 1,235 pairs so that no two shared a firm. Of these, 741 received letters, sent to the seller only, the buyer only, or both; the remaining 494 formed the control group. Because treated pairs were kept apart in the network, a correction by a firm that did not receive a letter points to communication between the two partners. The final sales loophole. Sales to consumers and to unregistered firms appear on a Ugandan VAT return as a single total, with no second report to check against. Sellers used this margin. When treated sellers amended their returns to add missing business-to-business sales, they cut their reported final sales by about 60% of that amount. The net gain in VAT was modest, but the letters still raised more than six times what they cost to send. Electronic invoicing in Uganda. After the 2018 experiment, the Uganda Revenue Authority expanded its data cross-checks. In 2021 it launched EFRIS (electronic fiscal receipting and invoicing), which requires input claims to be matched to VAT invoices, and in 2022 it began rolling out electronic billing machines that record transactions at the point of sale. The reflection problem. Charles Manski named it in "Identification of Endogenous Social Effects: The Reflection Problem" (Review of Economic Studies, 1993). When connected firms perform alike, it is hard to tell whether one influenced the other or whether similar firms simply chose to trade together. Nuriye's point about productive firms sorting into relationships with other productive firms is this problem in a supply chain. Her team addresses it by using the precise timing of each first-time robot purchase and checking for trends that predate it. Knowledge spillovers and product market rivalry. A firm can gain when a partner adopts a new technology and lose when a competitor does. Nicholas Bloom, Mark Schankerman and John Van Reenen set out the difficulty of separating the two effects in "Identifying Technology Spillovers and Product Market Rivalry" (Econometrica, 2013). Bilgin, Faia and Ottaviano separate them by the direction of the link. Suppliers pass gains down to their customers; rivals that sell to the same customers compete them away. Turkiye's matched firm data. The robot study links VAT returns covering firm-to-firm transactions, collected by the Ministry of Finance, with employer-employee records from the Social Security Institution, customs records from the Ministry of Trade, and registry and balance sheet data from the Ministry of Industry and Technology. The data run from 2007 to 2019. Robot purchases are identified by matching firms' fiscal codes with members of ENOSAD, the Turkish industrial automation manufacturers' association, and imported robots by their customs code, which also records the country of origin and whether an intermediary was involved. Robot quality and technical support. Robots from Switzerland and Germany, which sell at higher prices than those from China, generate larger spillovers to the adopter's customers. Robots bought through intermediaries that also provide technical support produce the largest effects. Four years after a supplier's first purchase, its customers' productivity is 14% higher when the robot came through an intermediary, against 6.3% when it came from a domestic producer. Linking surveys to administrative records. Justine mentions separate work by her co-author David Henning, who surveyed Ugandan firms and linked their answers to their tax returns. The combination reveals informal activity that administrative data alone cannot see, including among firms that had left the formal tax system. Listen nextNo taxation without administration: What makes tax authorities work, a VoxDev Talks episode in which Anders Jensen and Jonathan Weigel review the evidence on how tax authorities are organised, staffed and run, and why third-party data has limits where informality is high. Related readingTechnology spillovers, diffusion, and rivalry in firm networks, a VoxEU column in which Bilgin, Faia and Ottaviano summarise the robot study. Strategic or confused? Firm behaviour and missing millions in Uganda's VAT, a VoxDev article on the earlier study that showed how often Ugandan sellers and buyers disagree about the same transaction. VAT in developing countries: flawed, but irreplaceable, a VoxDev article by Anne Brockmeyer, Giulia Mascagni, Mazhar Waseem, Miguel Almunia and Vedanth Nair, which draws on VAT administrative data from 11 countries to show where the tax falls short of its textbook design.

How can we cut corruption in government, procurement that generates kickbacks for local politicians? We could hire officials on merit. Across the developing world, many governments now do exactly that. So why do public contracts still go to political friends? In this week's VoxDev Talk, Sarah Brierley (LSE) tells Tim Phillips why merit-based hiring is not enough. If politicians cannot choose who gets the job, they can often control what happens next: where officials work, and whether they are promoted. This power may be sufficient to co-opt them. In Ghana, where she did much of her research, nearly half of senior local officials say contracts in their district go to firms that fund the ruling party.  The research behind this episode: Brierley, Sarah. 2026. The Co-opted State: How Politicians' Control Over Bureaucrats' Careers Threatens Governance. Cambridge: Cambridge University Press. Open access. To cite this episode: Phillips, Tim, and Sarah Brierley. 2026. "How politicians co-opt bureaucrats.” VoxDev Talks (podcast).About the guestSarah Brierley is Associate Professor of Comparative Politics in the Department of Government at the London School of Economics and Political Science. Her research spans the state, corruption, bureaucracy, and election campaigns, with a focus on sub-Saharan Africa. She holds a UKRI Future Leaders Fellowship for a project on political finance in Africa. Research cited in this episodeClientelism. Politicians hand out public resources, such as schools, jobs or contracts, in return for votes. Most research assumes that officials simply do what politicians ask. Sarah argues that officials have real control over who gets what, so politicians must first win them over. Hiring on merit. Sarah checks whether senior local officials in Ghana are hired on merit in three ways: expert surveys, a survey of the officials themselves, and staff records. Of those hired between 2010 and 2016, 67% sat an exam. When the governing party changed after the 2008 election, the kind of people hired into professional jobs did not change. The kind of people hired into low-skilled jobs did. Randomised response technique. A way to ask survey questions that people would rather not answer. Each person rolls a die where the interviewer cannot see it. On one number they must say "yes", on another "no", and otherwise they tell the truth. Nobody knows what any one person meant, but the odds of each roll are known, so the true share of "yes" answers can be calculated across the whole survey. Using this method, Sarah found that 46% of 864 senior officials in 80 local governments say contracts go to firms that fund the ruling party. Career control tools. Sarah's name for the ways politicians can shape an official's career after hiring: promotions, the work they are given, and where they are posted. Transfers are the main tool in Ghana. Officials who think their mayor can easily move them are more likely to report corruption. In a second survey question, 58% of officials said that exposing misconduct would likely get them transferred. Whistleblower protection. Ghana's Whistleblower Act, 2006 (Act 720) protects people who report wrongdoing from punishment, including unwanted transfers, and can pay them a reward. But in a small local office it is almost impossible to stay anonymous, so the protection counts for little in practice. Local electoral competition. Competition between parties at national level is usually good for reform. Sarah finds that close contests at local level have the opposite effect. When seats are won and lost on small margins, campaigns cost more, and politicians have more reason to get money out of public contracts. India and Indonesia. Both countries hire senior officials through competitive exams. In India, members of the Indian Administrative Service change jobs on average every 16 months, and transfers become more likely when state leadership changes (Iyer and Mani 2012). Proposals to set a minimum time in post have not been adopted. In Indonesia, politicians also interfere in promotions. Promotion panels. In Ghana's local government service, promotions are decided by panels that include professional officials, so politicians rarely use them as a threat. Sarah suggests using similar panels to approve transfers, so no single politician can move an official at will. Campaign spending caps. Limits on how much candidates can spend. Many countries in sub-Saharan Africa have none. India has them, but candidates routinely spend far more (Chauchard 2018). Sarah points to the UK's Corrupt and Illegal Practices Act of 1883, which set strict limits that were enforced in court. Total campaign spending fell by 40% between the 1880 and 1885 elections (Rix 2008). More VoxDev Talks episodesWhy civil service reform fails (and what actually works). Martin Williams looks at 131 attempts to reform the civil service in six African countries, and why none fully succeeded. Related reading on VoxDevBureaucracy, the VoxDevLit review of the evidence on how officials are selected, paid and managed. Autonomy, incentives, and the effectiveness of bureaucrats, on evidence from Nigeria and Ghana that civil servants with more freedom complete more of their projects. Should civil servants be allowed to serve in their home areas? Evidence from India, on what happens when officials are posted close to home.

This is an episode from VoxDev's new podcast series, Ideas in Development. This series has a separate podcast feed, where you can find every episode of Oliver Hanney’s conversations on evidence. YouTube: https://www.youtube.com/watch?v=zpOCMtfSF1A Apple Podcasts: https://podcasts.apple.com/us/podcast/how-brac-partners-with-governments-to-fight-poverty/id1866874059?i=1000788403797 Spotify: https://open.spotify.com/episode/5lTrMYBVrQkAXoDrIOeEVa?si=Xu5hb5XnQWitnY5NoCmzrg Audioboom: https://audioboom.com/posts/8949627-how-brac-partners-with-governments-to-fight-poverty  The ultra-poor graduation approach has one of the strongest evidence bases in development. Almost all of that evidence comes from NGO delivery – but true scale normally means government delivery. Stephanie Brockerhoff, Director for Programme Design and Impact at BRAC's Ultra-Poor Graduation Initiative, joins Oliver Hanney to explain why anti-poverty pilots often fall apart at handover, how BRAC partners with governments, and the bottlenecks to scale that remain. Ideas in Development is a VoxDev podcast on economic policy and research. Find us wherever you get your podcasts, and read the full write-up on our Substack: https://ideasindevelopment.substack.com/

Research on how to collect more tax in developing countries has focused on how information, especially administrative data, can help. But in Uganda for example, buyers and sellers report different amounts for the same VAT transaction in 79% of cases. The invoices exist ... but nobody in the tax administration is comparing them. In this week's VoxDev Talk Anders Jensen (Harvard Kennedy School) and Jonathan Weigel (UC Berkeley) argue that information needs an administration that is able to use it. They have examined the research evidence on how tax authorities are organised, who they hire, where they send their staff, and how much freedom those officials get. To maximise revenues they find that many of Max Weber's century-old rules for how to run a bureaucracy still apply, but others often need to bend a little.  The research behind this episode: Jensen, Anders, and Jonathan L. Weigel. 2026. "No Taxation without Administration: Bringing the State Back into the Public Finance of Developing Countries." Journal of Economic Literature 64 (1): 246-280. The working paper version is available as NBER Working Paper 34729. To cite this episode: Phillips, Tim, Jonathan Weigel, and Anders Jensen. 2026. "No Taxation without Administration." VoxDev Talks (podcast).About the guestsAnders Jensen is Associate Professor of Public Policy at Harvard Kennedy School, a Faculty Research Fellow at the National Bureau of Economic Research, and research co-director of the State programme at the International Growth Centre. His research spans the rise of modern tax systems, informality and consumption taxes, and how governments with limited capacity can improve tax administration and enforcement. He works with governments in Ghana, Zambia, Liberia and Brazil. Jonathan Weigel is Assistant Professor of Business and Public Policy at the Haas School of Business, University of California, Berkeley, and a Faculty Research Fellow at the National Bureau of Economic Research. His research spans state capacity, taxation, corruption, and the links between religion and institutions. His fieldwork is based mainly in the Democratic Republic of Congo, where he runs the research organisation ODEKA. Research cited in this episodeNo taxation without information. Dina Pomeranz's study of Chile's value-added tax showed how the paper trail between firms helps to enforce the tax; each firm has a reason to demand an invoice from its supplier, and the tax authority can use those invoices to detect evasion. Pomeranz, Dina. 2015. "No Taxation without Information: Deterrence and Self-Enforcement in the Value Added Tax." American Economic Review 105 (8): 2539-2569. Third-party reporting in Denmark. Henrik Kleven and co-authors ran a randomised tax audit experiment in Denmark. Evasion was close to zero on income that employers and banks report to the tax authority, and substantial on income that taxpayers report themselves. Kleven, Henrik Jacobsen, Martin B. Knudsen, Claus Thustrup Kreiner, Soren Pedersen, and Emmanuel Saez. 2011. "Unwilling or Unable to Cheat? Evidence from a Tax Audit Experiment in Denmark." Econometrica 79 (3): 651-692. Missing transactions in Uganda. The 79% figure comes from VAT reports in Uganda, where sellers and buyers declare different amounts for the same transactions. The gap suggests that the tax authority does not systematically cross-check the reports, or that firms act as if it does not. Almunia, Miguel, Jonas Hjort, Justine Knebelmann, and Lin Tian. 2024. "Strategic or Confused Firms? Evidence from 'Missing' Transactions in Uganda." Review of Economics and Statistics 106 (1): 256-265. The US tax gap. Even a high-capacity administration struggles without third-party data. For tax years 2014 to 2016, the Internal Revenue Service estimated that 55% of income subject to little or no information reporting, such as sole proprietor income, was misreported, compared with 1% of wages and salaries. Internal Revenue Service. 2022. Tax Gap Estimates for Tax Years 2014-2016. Publication 5364. Washington, DC: IRS. "In developing countries, tax administration is tax policy." The paper's epigraph comes from Milka Casanegra de Jantscher, who co-edited an IMF volume on tax administration with Richard Bird. The line sums up an older policy consensus that building the tax authority matters more than setting the right rates. Bird, Richard M., and Milka Casanegra de Jantscher, eds. 1992. Improving Tax Administration in Developing Countries. Washington, DC: International Monetary Fund. Weber's ideal bureaucracy. Max Weber described a "rational" bureaucracy with a single chain of command, specialised departments, recruitment by examination, promotion by seniority and decisions governed by rules rather than discretion. Jensen and Weigel use his categories to organise the evidence, and show how developing countries adapt them to local conditions. Weber, Max. 1978 (first published 1921). Economy and Society: An Outline of Interpretive Sociology. Berkeley: University of California Press. The sinews of power. The phrase comes from John Brewer's history of the British state, which credits a professional, specialised Excise Office with raising the revenue that paid for Britain's 18th-century wars. Brewer, John. 1990. The Sinews of Power: War, Money, and the English State, 1688-1783. Cambridge, MA: Harvard University Press. Medium taxpayer offices in Indonesia. Indonesia created dedicated offices for medium-sized corporate taxpayers, which sharply cut the number of taxpayers per auditor. Revenue from the firms in these offices rose by 64% in the short term and by 128% after six years. Basri, M. Chatib, Mayara Felix, Rema Hanna, and Benjamin A. Olken. 2021. "Tax Administration vs. Tax Rates: Evidence from Corporate Taxation in Indonesia." American Economic Review 111 (12): 3827-3871. Transfer mispricing and the arm's length principle. Multinationals can shift profits by setting the prices of transactions between their own subsidiaries. Tax authorities test these prices against the arm's length principle, which asks what unrelated firms would have charged each other. Staff in large taxpayer offices must learn to apply it; staff who deal with small firms never need to. The Pendleton Act. The US Civil Service Reform Act of 1883 introduced competitive examinations for federal jobs, to limit patronage appointments. Abhay Aneja and Guo Xu find that the reform improved public sector performance. Aneja, Abhay, and Guo Xu. 2024. "Strengthening State Capacity: Civil Service Reform and Public Sector Performance during the Gilded Age." American Economic Review 114 (8): 2352-2387. City chiefs as tax collectors. In Kananga, in the Democratic Republic of Congo, neighbourhoods were randomly assigned to property tax collection by state agents or by local city chiefs. Chiefs raised revenue by more than 40%, mainly because they knew which households were more willing to pay. Balan, Pablo, Augustin Bergeron, Gabriel Tourek, and Jonathan L. Weigel. 2022. "Local Elites as State Capacity: How City Chiefs Use Local Information to Increase Tax Compliance in the Democratic Republic of the Congo." American Economic Review 112 (3): 762-797. Assigning tax collectors. The same tax campaign randomly assigned collectors to teams and to neighbourhoods. Simulations suggest that pairing the best collectors together, and sending them to the neighbourhoods with the highest revenue potential, would raise compliance by 37% compared with random assignment. Weigel, Jonathan, Pedro Bessone, Augustin Bergeron, Gabriel Tourek, and John Kabeya Kabeya. 2025. "Supermodular Bureaucrats: Experimental Evidence from the DRC." American Economic Review. Discretion, technology and bribes. In Ghana, property tax collectors equipped with tablets and digital maps spent less time finding properties and more time deciding whom to revisit; collections rose by 103% relative to the control group. In Tajikistan, electronic filing removed face-to-face contact with inspectors, and firms at high risk of evasion paid more tax, probably because they could no longer bribe the inspector. Dzansi, James, Anders Jensen, David Lagakos, and Henry Telli. 2023. "Technology and Tax Capacity: Evidence from Local Governments in Ghana." NBER Working Paper 29923. Okunogbe, Oyebola, and Victor Pouliquen. 2022. "Technology, Taxation, and Corruption: Evidence from the Introduction of Electronic Tax Filing." American Economic Journal: Economic Policy 14 (1): 341-372. Public goods and tax compliance. Several studies test whether a government can persuade citizens to pay more tax by providing public goods first. In Acayucan, a small city in Mexico, randomised street paving raised property tax compliance. Programmes in Mexico City, Pakistan and Freetown, Sierra Leone, found small or mixed effects. Fernandez, Manuel, Marco Gonzalez-Navarro, and Climent Quintana-Domeque. 2025. "Local Public Goods and Property Tax Compliance: Evidence from Residential Street Pavement." Working paper. Khan, Adnan Q., Asim I. Khwaja, Benjamin A. Olken, and Mahvish Shaukat. 2023. "Strengthening the Social Compact: Experimental Evidence from Pakistan." Working paper. The demand-driven social contract. Douglass North and Barry Weingast argued that 17th-century English taxpayers agreed to pay more tax in exchange for a greater say in government. In Kananga, citizens in neighbourhoods assigned to door-to-door property tax collection became more likely to attend town hall meetings and to evaluate government performance. North, Douglass C., and Barry R. Weingast. 1989. "Constitutions and Commitment: The Evolution of Institutions Governing Public Choice in Seventeenth-Century England." Journal of Economic History 49 (4): 803-832. Weigel, Jonathan L. 2020. "The Participation Dividend of Taxation: How Citizens in Congo Engage More with the State When It Tries to Tax Them." Quarterly Journal of Economics 135 (4): 1849-1903. Procedural justice. Citizens are more likely to accept a

Many conversations about development for focus on aid: how much, from whom, and for how long. But aid has never been more than a small part of what pays for a country's development, and in 2025 it fell by 23.1%.  The need to rethink our attitude to development has inspired the Future of Development Cooperation Coalition (FDCC). In this week's episode, Alexia Latortue and Radha Rajkotia of FDCC talk to Tim Phillips about its first report,. The report assesses the development challenges of LMICs using a balance sheet approach, with assets on one side and liabilities on the other. Tax revenue, remittances, pension and sovereign wealth funds, trade, natural resources and the skills of the population sit on the asset side. Unsustainable debt, illicit financial flows, poor credit ratings, weak institutions, climate exposure and conflict sit on the other. The idea? Each country focuses on the policies to develop their most important assets, and minimise their most problematic liabilities. They argue that governments and donors alike should stop thinking of developing countries as recipients of aid, and start thinking of them as partners in economic development. The research behind this episode: Future of Development Cooperation Coalition. 2026. "The Development Balance Sheet: Rethinking Development Cooperation from the Ground Up." Published 20 May 2026. Research team: Radha Rajkotia, John Norris and Mma Amara Ekeruche. To cite this episode: Phillips, Tim, Alexia Latortue, and Radha Rajkotia. 2026. "Rethinking development cooperation: The case for a 'balance sheet' approach." VoxDev Talks (podcast). About the guestsAlexia Latortue is Head of Secretariat of the Future of Development Cooperation Coalition and a Distinguished Non-Resident Fellow at the Center for Global Development. She served as Assistant Secretary for International Trade and Development at the US Treasury, where she led work on reforming the multilateral development banks and on using public finance to pull private capital into emerging markets. She was previously Deputy CEO and Managing Director for Corporate Strategy at the Millennium Challenge Corporation, sat on the Executive Committee of the European Bank for Reconstruction and Development, and spent ten years at the World Bank working on financial inclusion, ending as Deputy CEO of CGAP. Radha Rajkotia is Director of Research at the Future of Development Cooperation Coalition and lead researcher on this report. She was Chief Executive Officer of Building Markets and, before that, Chief Research and Policy Officer at Innovations for Poverty Action, running its strategy across 22 countries. She spent eleven years leading the economic recovery and development unit at the International Rescue Committee, on work spanning cash-based relief and job creation in conflict settings. She holds a PhD in Refugee Studies from the University of Sussex, is a Senior Policy Fellow at the Henry Leir Institute at Tufts University, and teaches at Georgetown. Research cited in this episodeThe balance sheet approach. The report sets out assets and liabilities but argues that neither is a checklist. Some entries are country-specific, such as natural resource endowments or exposure to climate risk. Others are structural, such as a sovereign credit rating, which constrains or enables progress regardless of what a government does at home. The point of the exercise is situational awareness before prioritisation, not a universal to-do list. The 30 national development strategies. The research team reviewed the current development strategies of 30 countries across Africa, Asia and Latin America. All 30 prioritise economic transformation and human capital. Governance appears as a stand-alone pillar in two-thirds of them. Inequality is a defining element in almost every Latin American strategy and largely absent as an explicit constraint in Africa and Asia. Most countries frame technology as digital economy rather than as AI governance or chip access, which the report reads as a widening sophistication gap. Nigeria and Ethiopia. The report's worked comparison. Ethiopia attracts more than three times Nigeria's foreign direct investment despite being roughly 100 million people smaller. Nigeria has strong tax revenues, considerable pension fund assets, a heavy debt servicing burden and large losses to illicit financial flows. Ethiopia has a narrow tax base and weak compliance, suffers far less from illicit flows, carries a lighter debt service burden and is nonetheless in debt distress. Debt as both asset and liability. Low-income countries spend 18% of government revenue on average servicing foreign debt. Angola, Laos, Bhutan, Pakistan, Egypt, Sudan, the Bahamas, Tunisia, Zambia, Benin and Senegal each spent more than 30% of tax revenues on debt servicing in 2024. As of 2026, 27 countries face a high risk of debt distress and nine are already in it, the majority of them in Africa. Latortue argues that the problem is the price, tenor and currency of debt rather than debt itself, and that restructuring machinery built around the Paris Club has not kept up with a creditor base that now includes China, Gulf states and a large body of commercial lenders. Credit ratings. Only eight countries across Latin America and Africa hold an investment-grade rating from Moody's, Fitch or S&P. They are Chile, Mexico, Panama, Paraguay, Peru, Uruguay, Botswana and Mauritius. A UNDP analysis cited in the report estimates that flawed ratings have cost African countries as much as $74.5 billion in excess interest and foregone investment, more than the continent's entire net receipt of official development assistance. The African Union is launching its own credit rating agency in 2026. South-South trade. UNCTAD figures in the report put South-South merchandise exports at about $0.5 trillion in 1995 and $6.8 trillion in 2025. Some 57% of developing-country exports now go to other developing markets. Rajkotia points to the Africa Continental Free Trade Area and to Mercosur as existing infrastructure that could support production integration rather than trade agreements alone. Demographics. Africa's working-age population is expected to double by 2050, which the report treats as an asset conditional on policy. By 2050 only 26% of the world's population is projected to live in Europe, North America and China, falling to 18% by 2100. Domestic capital in Africa. Latortue cites more than $4 trillion of assets held across the African continent, a figure that combines central bank reserves, commercial bank assets, institutional investors, sovereign wealth funds, pensions and insurance. Her argument is that moving even a small share of it into productive investment would outweigh anything aid can now do. The report notes that Ghana mandated 5% of its pension fund for venture capital in 2025 and that Mexico legislated for an allowance of up to 30%. Conflict. The one item Latortue places firmly on one side of the ledger. She counts at least 60 live conflicts worldwide. The Peace Research Institute Oslo recorded more conflicts in 2024 than at any point since the Second World War, and more than half of all conflict-affected states now face at least two separate internal conflicts. Development work has a role in keeping the real economy going, she says, but the solutions are political. More VoxDev Talks episodesThe end of aid dependency. W. Gyude Moore argues that the contraction in aid is structural and that governments should use growth diagnostics to decide which offers of assistance to accept and which to turn down. The closest companion piece to this episode. Ethiopia's economy: Mamo Mihretu on economic reform and the macroeconomic foundations of growth. The other half of the report's Nigeria and Ethiopia comparison, told by the person who ran the reforms. Why civil service reform fails and what actually works. Martin Williams on the execution gap that this report identifies as a liability in its own right. Related reading on VoxDevTaxation in LMICs, a VoxDevLit edited by Anders Jensen, Anne Brockmeyer and Lucie Gadenne, reviews the evidence on why governments in low- and middle-income countries collect so much less of national income than their richer counterparts.

By 2018 the reservoirs supplying Cape Town were down to 20% of capacity. If they reached 13.5%, the city would need to shut down parts of the water network and send residents to collection points to fetch water. That was known as Day Zero, and the rain came just in time to avoid it. Hugh Cole (City of Cape Town) joined the city government in the middle of the crisis, and has subsequently driven the use of data for many aspects of city planning, not just for water. Cape Town now runs its own household survey, works with a private sector partner to measure net migration, and randomises the rollout of water meters so it can find out how they change behaviour. It also runs trials on its electricity subsidy to check whether the money reaches the households it is meant to reach.  Cole tells Tim Phillips how the Day Zero near miss changed how the city's leadership uses evidence, and how other cities can follow the same path. The research behind this episode: Abajian, Alexander C., Cassandra Cole, Kelsey Jack, Kyle C. Meng, and Martine Visser. 2025. "Dodging Day Zero: Drought, Adaptation, and Inequality in Cape Town." NBER Working Paper 33468. Cole, Hugh, Kelsey Jack, Derek Strong, and Brendan Maughan-Brown. 2020. "City of Cape Town, South Africa: Aligning Internal Data Capabilities with External Research Partnerships." In Handbook on Using Administrative Data for Research and Evidence-based Policy, edited by Shawn Cole, Iqbal Dhaliwal, Anja Sautmann, and Lars Vilhuber. Cambridge, MA: Abdul Latif Jameel Poverty Action Lab. To cite this episode: Phillips, Tim, and Hugh Cole. 2026. "Cape Town's day zero: How data rebuilt a city's water resilience." VoxDev Talks (podcast).About the guestHugh Cole is Director of Policy and Strategy and Chief Data Officer at the City of Cape Town, where his department covers strategic policy, strategic planning, research and economic analysis. He is a Visiting Senior Fellow at the School of Public Policy at the London School of Economics. Before joining the city in 2017 he was Director of Country Programmes at the International Growth Centre, running teams in 14 countries across sub-Saharan Africa and South Asia. Research cited in this episodeDay Zero. The term began in the media as the day Cape Town's taps would run dry, then settled on something more specific. It became the day dam levels would hit 13.5%, at which point the city planned to shut down parts of the reticulation network and open water collection points, sequenced so that the most vulnerable communities were affected last. Dodging Day Zero. Abajian, Cole, Jack, Meng and Visser use municipal billing records to show what the emergency measures did to different households. Before the drought, richer households used twice as much piped water as poorer ones; at the peak of the crisis they used less, partly because they could drill boreholes and substitute private groundwater for the public supply. That eroded the utility's revenue and shifted the cost of supply towards households who could not afford a private alternative, which is why the tariff reform that followed matters as much as the conservation campaign did. Zonal water balance assessment. Pressure management in the network was one of the two measures Cole credits with the largest effect during the drought, alongside communication with residents. Managing pressure means knowing the boundaries of each pressure zone, and those boundaries had drifted over years of pipes being added and not always recorded. The remapping exercise that followed compares water entering a zone with water leaving it, and it is still going on. The Green Dot map. During the drought the city published a neighbourhood level map of household water consumption, developed with academic partners including Martine Visser at the University of Cape Town. Households within their usage band showed as a green dot. The aim was peer pressure at street level rather than a citywide number. The Water, Air and Energy Lab. Launched in March 2024 by J-PAL Africa at the University of Cape Town, the City of Cape Town and Community Jameel, the WAE Lab pairs city policymakers with researchers to run randomised evaluations on clean air, water and reliable energy. Kelsey Jack is its scientific advisor. It is part of a network of J-PAL air and water labs that also includes national and state level labs in Egypt and India. Free basic electricity. Cape Town subsidises electricity for low-income households, targeted using thresholds on property value and consumption. Because eligibility turns on a cutoff, households just above and just below it are otherwise similar, which lets researchers separate the effect of the subsidy from everything else that differs between rich and poor households. The city funds this transfer from its own budget rather than through National Treasury grant regimes. Advanced metering infrastructure. The city is replacing water meters with digital ones to improve billing accuracy, revenue recovery and leak detection, and to see whether more frequent consumption information changes what households use. Contractor capacity and budget mean the rollout has to be phased, and the phasing is what makes randomisation possible. Charging ahead. An earlier Cape Town collaboration with the same origins. Jack, B. Kelsey, and Grant Smith. 2020. "Charging Ahead: Prepaid Metering, Electricity Use, and Utility Revenue." American Economic Journal: Applied Economics 12(2). Over 4,000 customers were switched from monthly billing to prepaid meters in a randomised order; electricity use fell by about 13%, and the utility recovered more of its revenue on time. Non-revenue water. Water that is produced and then lost before it can be billed, mostly through leaks. It is a persistent problem for utilities across the continent, and separating the leak detection effect of new meters from the behavioural effect on households is one of the questions the city wants answered. Data protection. South Africa's Protection of Personal Information Act is the law Cole refers to as the local equivalent of the European Union's GDPR. It governs what the city can share, and it is why partnerships with banks and telecommunications firms on the informal economy are framed around aggregated and anonymised data. More VoxDev Talks episodesMinibuses, major gains: Rethinking urban transit in developing countries. Lucas Conwell on the privately run minibus networks that Cape Town depends on, and the policy tweaks that would make them work better. Cole describes the city's own minibus taxi reform programme in this episode. The role of cities in economic development. Edward Glaeser and Diego Puga on why the cities of the developing world are the place to look. Cole quotes Glaeser twice here, so this is the natural next listen. How AI can put 20 years of development evidence to work. Iqbal Dhaliwal of J-PAL on why new technology only helps when it is attached to an existing evidence base. Related reading on VoxDev.orgAvoiding day zero: Drought and water pricing in South Africa. The authors of the paper set out how private adaptation by wealthy households undermined the utility's ability to cross-subsidise everyone else, and what the tariff reform did about it. Charging ahead: Prepaid metering, electricity use, and utility revenue. Kelsey Jack and Grant Smith on the Cape Town prepaid metering trial, and what it means for utilities trying to serve low-income customers.

In 1978, a farmer in rural China could not sell a sack of grain above the state quota, choose an employer, or move to the nearest city without a permit. In this week's VoxDev Talk, Kaiji Chen and Tao Zha (both Emory University and Atlanta Fed) explain how China dismantled barriers like this one at a time. Gradualist reform first gave farmers the right to sell surplus grain at market prices. Small state firms were privatised 19 years later, while the largest kept state backing. This style of reform powered two distinct growth engines: first, labour moving off the land, then a wave of capital into infrastructure and property. The result: half a century of unprecedented growth -- but it also produced the debt, inequality and trade tension now working against China's growth model. The research behind this episode: Chen, Kaiji, and Tao Zha. 2025. "China's Macroeconomic Development: The Role of Gradualist Reforms." Journal of Economic Literature 63 (4): 1331-62. To cite this episode: Phillips, Tim, Kaiji Chen, and Tao Zha. 2026. "Fifty years of Chinese growth: The gradualist reform strategy explained." VoxDev Talk (podcast).About the guestsKaiji Chen is Professor of Economics at Emory University and a research fellow at the Federal Reserve Bank of Atlanta's Center for Quantitative Economic Research. His research spans financial contracts, business cycles and China's macroeconomy, with recent work on housing policy, credit allocation and household consumption in China. Tao Zha is the Samuel Candler Dobbs Professor of Economics at Emory University and executive director of the Center for Quantitative Economic Research at the Federal Reserve Bank of Atlanta. He is a research associate at the National Bureau of Economic Research and was elected a Fellow of the Econometric Society in 2017. His research spans macroeconomics, financial economics and econometrics, with a long standing focus on China's economy. Research cited in this episodeThe household responsibility system. Piloted in Sichuan and Anhui from 1978 and adopted nationwide by 1980, this reform kept land collectively owned but contracted it to individual households, who could sell output above a fixed state quota at market prices. It replaced work point pay with a direct link between effort and income, and the productivity gains it released freed the rural labour surplus behind China's first wave of industrialisation. Township and village enterprises (TVEs). Rural, collectively owned firms that absorbed workers leaving agriculture through the 1980s and 1990s, often with local governments acting as guarantors for bank credit the firms could not secure alone. TVE employment grew from 28 million in 1978 to 135 million by 1997, and TVE output rose from under 6% of GDP to 26% over roughly the same period. The hukou system. China's household registration system, introduced in 1958, ties access to housing, healthcare, education and grain rations to a person's registered location, rural or urban. It made moving to a city without an urban permit practically impossible. Restrictions eased in stages from the late 1990s, and the formal rural urban distinction was removed nationwide only in 2014. "Grasp the large, let go of the small." The policy, initiated in 1997, under which China privatised or allowed the bankruptcy of small and medium state owned enterprises while retaining state control of the largest, most capital intensive firms in sectors such as infrastructure, energy and real estate. WTO accession and permanent Most Favoured Nation status. China joined the World Trade Organization in 2001. From 2002, permanent MFN status with the United States removed the annual threat of tariff spikes on Chinese exports, a stability that Chen and Zha's paper credits with accelerating China's shift from labour intensive exports toward electronics and other capital intensive goods. The 2009 stimulus and local government financing vehicles. In response to the global financial crisis, China launched a four trillion RMB fiscal package alongside a sharp expansion of bank lending. Much of the resulting infrastructure spending ran through local government financing vehicles, off budget entities set up to borrow for public projects; the debt they built up is now central to China's financial stability risks. Total social financing. International Monetary Fund. 2026. "People's Republic of China: 2025 Article IV Consultation." IMF Country Report No. 26/044. The IMF's broadest measure of credit in the Chinese economy, the figure Kaiji Chen cites as roughly 315% of GDP in 2025. More VoxDev Talks episodesThe Four Pests campaign and China's Great Famine, in which Shaoda Wang traces a darker chapter of Chinese economic history, the mass eradication of sparrows during the Great Leap Forward and the millions of deaths that followed. The rise and fall of China's overseas lending, in which Sebastian Horn explains how China became the developing world's largest bilateral creditor, and why that lending boom has now gone into reverse. Related reading on VoxDev.orgThe Mandarin model of growth, on how China's system of promoting local officials for delivering growth shaped decades of investment led expansion. How China became the world's factory: Trade, industrial policy, and growth, on the trade liberalisation and industrial policy that took China from export processing to global manufacturing leader. The bubble dynamics of China's housing boom, Edward Glaeser on the construction surge behind the price rises Chen and Zha describe in this episode.

The ballot cast by a landless labourer counts the same as the one cast by the landlord whose fields he works. In this way, democracy can give excluded or subordinate groups access to political power. That's not what has happened, at least, not in large parts of the Global South. Amit Ahuja (UC Santa Barbara) calls those at the bottom of the social order "subaltern groups". Three barriers stand between their votes and any lasting gain. Violence that goes unpunished. The erasure of their shared culture and history by those in power. And they have too little money and organisation to campaign for their rights. The evidence shows that since 2014 the gains that these groups made in the previous three decades have started to reverse, he warns. The old hierarchies are reasserting themselves. The research behind this episode: Ahuja, Amit. 2026. "Subaltern Mobilization in the Global South." Annual Review of Political Science 29: 391-411. Open access. To cite this episode: Phillips, Tim, and Amit Ahuja. 2026. "Caste, race, and power: The barriers to political inclusion." VoxDev Talks (podcast).About the guestAmit Ahuja is Associate Professor of Political Science at the University of California, Santa Barbara, with research spanning ethnic parties and movements, military organisation, caste, and the politics of inclusion and exclusion in multiethnic societies. His book Mobilizing the Marginalized: Ethnic Parties Without Ethnic Movements won the 2020 Kamaladevi Chattopadhyay NIF Book Prize. He co-edited Internal Security in India: Violence, Order, and the State with Devesh Kapur. Research cited in this episodeSubaltern. The word means "of inferior rank" and was used by Antonio Gramsci in the Prison Notebooks to describe groups subordinated by a ruling elite. Ahuja gives it three working attributes: a stigmatised identity acquired at birth, disproportionate poverty, and disadvantage that passes from one generation to the next. Ranked and unranked social orders. Donald Horowitz, in Ethnic Groups in Conflict (1985; University of California Press, 2000 edition), separates societies where groups sit in a vertical hierarchy from those where they sit side by side. The Hausa-Fulani, Igbo and Yoruba in Nigeria, and Maronite Christians, Sunnis and Shia in Lebanon, compete without one being formally subordinate to another. Hierarchy is not a universal feature of diverse societies. Greed against grievance. Paul Collier and Anke Hoeffler argued in 2004 that people join insurgencies to capture resources such as diamonds or minerals; Ted Gurr's Why Men Rebel (1970) argued instead that rebellion follows the gap between what people have and what they expect. Ahuja adds a third answer drawn from ethnography. The dignity of insurgency. Elisabeth Wood's study of El Salvador (2003) and Alpa Shah's work on Maoist central India (2013) both find that the poor support armed movements partly because insurgents treat them better than landlords and state officials do. Participation confers dignity in a setting built to deny it. The identity penalty. Devorah Manekin and Tamar Mitts (2022) find that nonviolent campaigns led by marginalised groups attract less popular participation and fewer elite defections than comparable campaigns led by dominant groups. Nonviolence works, but not equally well for everyone. Undocumented rights. Afro-descendant communities on Colombia's Pacific coast, the San in the Central Kalahari, and Adivasis in India's forests all hold customary claims that colonial and postcolonial registries never recorded. Without a written record they are reclassified; Adivasis became "encroachers" under British forest law and the conservation regimes that followed. The Dalit Panthers. Formed in western India in the 1970s, the group combined revolutionary politics with armed self-protection for Dalits facing caste violence, taking its name and some of its style from the Black Panther Party. Military service as a school for organisers. Black South Africans recruited during the Second World War, and Dalits taken into the British Indian Army during the world wars, both emerged with leadership training and a more assertive political style. Dominant groups are usually reluctant to arm subaltern populations; labour shortages force the question. The Indian Election Commission. Amit Ahuja and Susan Ostermann (2018) trace how the commission secured polling stations through the 1990s and 2000s, which made it possible for parties to bring marginalised voters to the poll. Institutional autonomy, backed by the courts, can partly offset a coercive environment. Co-optation in Bolivia. Movimiento al Socialismo absorbed parts of the country's Indigenous movement and blunted its radical edge. Alignment with a party brings resources and patronage positions; it can also cost a movement its original demands. More VoxDev Talks episodesCan contact between groups reduce prejudice? Matt Lowe on why decades of evidence for the contact hypothesis look weaker under preregistration, and why prejudice does not simply fade with development. Caste, identity, and worker productivity in India Daniel Keniston on how caste still sorts Indians into occupations, and what the economy loses because of it. Related reading on VoxDev.orgSomething to complain about: How minority representatives overcome ethnic barriers, on a formal complaints system in Bihar that gave Scheduled Caste ward members leverage over village heads who were holding up their projects. How expanding voting rights shaped politics in India. Franchise expansion in 1935 and 1950 barely moved turnout or competition, and yet it shifted public spending towards the newly enfranchised. No representation without reservation: The long-term limits of gender quotas in India, on what happens to descriptive representation once the quota is withdrawn.

Do economists treat what men do as normal human behaviour, and then study norms around women as a departure? If so, we need to pay more attention what we mean by masculinity. That's what Pauline Grosjean (University of New South Wales, CEPR) does. She argues that these masculinity norms carry economic weight of their own. What do men around the world think "being a man" means? The consistent answers: winning against other men, self-reliance, control over women, aggression, and the avoidance of anything coded as weak or homosexual. Grosjean and her co-authors measure adherence to these core dimensions across 70 countries. How do these beliefs vary by age, economic development, and culture? And what do they predict about the way men will behave? The research behind this episode: Matavelli, Ieda, Pauline Grosjean, Ralph De Haas, and Victoria Baranov. 2026. "Masculinity Norms and Their Economic Implications." Annual Review of Economics 18:127-55. To cite this episode: Phillips, Tim, and Pauline Grosjean. 2026. "Masculinity norms and their economic implications." VoxDev Talks (podcast).About the guestPauline Grosjean is a professor in the School of Economics at the University of New South Wales and a fellow of the Centre for Economic Policy Research. Her research spans culture and institutions, gender roles, violence and conflict, and how historical conditions shape economic behaviour long after those conditions have gone. Research and concepts cited in this episodeMasculinity norms. Social expectations about how men should behave, or how a "real man" should behave. Grosjean draws the distinction from gender-role norms, which define men relative to women. Masculinity norms are largely about how men rank against other men. The five core dimensions measured in the survey are the importance of winning and status, self-reliance and help avoidance, violence, power over women, and avoidance of homosexuality. Global Masculinity Survey. The 70-country survey behind the review, built on measurement tools developed by social psychologists and run in partnership with the European Bank for Reconstruction and Development across its countries of operation, then extended to a further 32 countries. See De Haas, Ralph, Victoria Baranov, Ieda Matavelli, and Pauline Grosjean. 2024. "Masculinity Around the World." CEPR Discussion Paper 19493 (gated). Male-biased sex ratios in colonial Australia. Grosjean's earlier work uses convict transportation, which left parts of Australia with far more men than women, as a natural experiment. Areas that were historically male-biased show stronger masculinity norms today, more violence and male suicide, and weaker support for same-sex marriage; the last of these puzzled economists, because a shortage of women should, on a supply-and-demand reading, make men more relaxed about other men's homosexuality, not less. See Baranov, Victoria, Ralph De Haas, and Pauline Grosjean. 2023. "Men. Male-Biased Sex Ratios and Masculinity Norms: Evidence from Australia's Colonial Past." Journal of Economic Growth 28:339-96. Ten to Men. An Australian longitudinal study of male health that measures both adherence to masculinity norms and a range of self-reported violent behaviour. Grosjean cites its strong associations between norm adherence and interpersonal aggression, sexual violence and self-directed harm. Testosterone and status seeking. The link often assumed to run from testosterone to aggression is, on the evidence, better read as a link to status seeking, with aggression only one of its possible expressions. Testosterone itself responds to social context, diet and caregiving, so it sits inside the culture rather than outside it. Misperceived norms. Men often overestimate how strongly other men endorse restrictive norms, and also misjudge what women want, believing women approve of controlling or emotionally closed behaviour when they do not. Grosjean links this to Marianne Bertrand's work on men declining paternity leave for fear of others' disapproval, and to the gender-segregated online spaces of the manosphere, where the norms are advertised and reinforced. School intervention in Brazil. An ongoing trial with Ieda Matavelli comparing two approaches in schools, one closer to cognitive behavioural therapy and one that directly tackles beliefs about what it means to be a man. Matavelli's earlier work documents how warped young men's views of others' expectations can be, and tests whether correcting them changes behaviour. More VoxDev Talks episodesNon-elite women in politics. Soledad Artiz Prillaman on how patriarchal norms and social networks shape which women can take part in politics, and why a seat count tells you little about power. Paid work for women and domestic violence. Deniz Sanin on how the spread of coffee mills in Rwanda gave women paid work and, with it, less violence at home. Related readingMasculinity norms and their economic consequences, a VoxEU column by the four authors setting out how these norms shape labour markets, health, education, households and politics, with the country and individual-level survey findings.