Esther Duflo : We do n't know . '' 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 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 .