1. FLAME University, Centre for Experimental Social Sciences, Pune 412 115, India (e-mail: )
2. Department of Economics, Duke University, 213 Social Sciences Building, Box 90097, Durham, NC 27708 (e-mail: )
3. John F. Kennedy School of Government, Harvard University, 79 JFK Street, Box 46, Cambridge, MA 02138 (e-mail: )