[1] Innovat Poverty Act, New Haven, CT 06510 USA
[2] Bill & Melinda Gates Fdn, Seattle, WA 98102 USA
[3] Jameel Poverty Act Lab, Cambridge, MA 02142 USA
[4] Dartmouth Coll, Dept Econ, Hanover, NH 03755 USA
[5] Univ Calif Berkeley, Dept Agr & Resource Econ, Berkeley, CA 94720 USA
[6] Catholic Univ Louvain, B-1348 Louvain, Belgium
[7] Emory Univ, Rollins Sch Publ Hlth, Hubert Dept Global Hlth, Atlanta, GA 30322 USA
[8] Natl Bur Econ Res, Cambridge, MA 02138 USA
[9] Univ Calif Berkeley, Dept Econ, Berkeley, CA 94720 USA
[10] Harvard Univ, Cambridge, MA 02138 USA
[11] Brookings Inst, Washington, DC 20036 USA
[12] Yale Univ, New Haven, CT 06520 USA
[13] World Bank, Washington, DC 20433 USA
[14] MIT, Dept Econ, Cambridge, MA 02142 USA
[15] Ctr Rech Econ & Stat, F-92245 Malakoff, France