1. Stanford University, 579 Serra Mall, Stanford, CA 94305 (email: )
2. University of California, Berkeley, 289 University Hall, Berkeley, CA 94720 (email: )
3. Development Research Group, the World Bank, MSN MC3-307, 1818 H Street NW, Washington, DC 20433 (email: )
4. Stanford University, Faculty Building W311, 655 Knight Way, Stanford, CA 94305.