Esther Duflo : We do n't know if policies in aid to fight poverty actually worked . She believes scientific research can determine which policies work . Duflo won award as most accomplished American woman under the age of 40 .
Esther Duflo : We do n't know if billions in aid to fight poverty actually worked . She says scientific method can determine which policies work . Duflo received award as most accomplished American economist under the age of 40 .