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1 Department of Psychology and Woodrow Wilson School of Public Affairs, Princeton University, Princeton, NJ, USA. cmetcalf@princeton.edu haushofer@princeton.edu.
2 National Bureau of Economic Research, Cambridge, MA, USA.
3 Busara Center for Behavioral Economics, Nairobi, Kenya.
4 Center for Global Development, Washington, DC, USA.
5 Max Planck Institute for Collective Goods, Bonn, Germany.
6 Department of Ecology and Evolutionary Biology and Woodrow Wilson School of Public Affairs, Princeton University, Princeton, NJ, USA. cmetcalf@princeton.edu haushofer@princeton.edu.
1 Department of Psychology and Woodrow Wilson School of Public Affairs, Princeton University, Princeton, NJ, USA. cmetcalf@princeton.edu haushofer@princeton.edu.
2 National Bureau of Economic Research, Cambridge, MA, USA.
3 Busara Center for Behavioral Economics, Nairobi, Kenya.
4 Center for Global Development, Washington, DC, USA.
5 Max Planck Institute for Collective Goods, Bonn, Germany.
6 Department of Ecology and Evolutionary Biology and Woodrow Wilson School of Public Affairs, Princeton University, Princeton, NJ, USA. cmetcalf@princeton.edu haushofer@princeton.edu.