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  • VoxDev Development Economics

    S7 Ep54: Tracking Kenya's tractors

    22/10/2026 | 12 min
    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 episode

    Nottmeyer, 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 episode

    Phillips, Tim, and Sophie Nottmeyer. 2026. "Tracking Kenya's tractors." Conversations on Transformation (podcast).
    About the guest

    Sophie 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 episode

    Hello 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 episodes

    Moving 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 reading

    Misallocation 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.
  • VoxDev Development Economics

    S7 Ep53: Implementation science in education: Scaling what works

    21/10/2026 | 26 min
    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 guest

    Noam 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 episode

    Learning 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 episodes

    The 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 VoxDev

    Implementation 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.
  • VoxDev Development Economics

    S7 Ep52: Is electricity a weak link in development?

    15/10/2026 | 23 min
    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 episode

    Colmer, 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 episode

    Phillips, Tim, and Martin Shu. 2026. "Is electricity a weak link in development?" Conversations on Transformation (podcast).
    About the guest

    Martin 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 episode

    Weak 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 episodes

    A 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 reading

    Can 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.
  • VoxDev Development Economics

    S7 Ep51: The critical minerals scramble

    14/10/2026 | 26 min
    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 guest

    Christopher 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 episode

    Leopold 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 episodes

    No 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 VoxDev

    Mining 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.
  • VoxDev Development Economics

    Ideas in Development: GiveDirectly's journey to scale

    09/10/2026 | 55 min
    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/
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