1. Wellesley Centers for Women, Wellesley College, Wellesley, Massachusetts 02481;
2. Entrepreneurial Management Unit, Harvard Business School, Boston, Massachusetts 02163;
3. National Bureau of Economic Research, Cambridge, Massachusetts 02138
4. Development Research Group, World Bank, Washington, DC;
5. Department of Economics, University of Western Australia, Perth WA 6009, Australia;
6. International Migration Institute, University of Oxford, Oxford OX1 3TB, United Kingdom