1 Department of Economics, Center for Modern Indian Studies, and Courant Research Centre "Poverty, Equity and Growth in Developing Countries", University of Göttingen, Göttingen, Germany; Harvard Center for Population and Development Studies, Harvard School of Public Health, Cambridge, MA, USA. Electronic address: svollmer@uni-goettingen.de.
2 NADEL, ETH Zurich, Zurich, Switzerland.
3 Social Sciences, Indian Institute of Technology Gandhinagar, Ahmedabad, Gujarat, India.
4 Harvard Center for Population and Development Studies, Harvard School of Public Health, Cambridge, MA, USA.
5 Department of Economics, Center for Modern Indian Studies, and Courant Research Centre "Poverty, Equity and Growth in Developing Countries", University of Göttingen, Göttingen, Germany.