Esther Duflo, Nobel Prize-winning economist - BBC HARDtalk

Shaun Ley speaks to the Nobel Prize winning economist Esther Duflo. The experimental trails she ran with two colleagues in Africa and India produced some surprising results. Among their findings: food aid isn’t helping the poor, and the poorest kids don’t need more books, they need more time. A fashionable idea wins the Nobel Prize. But can economists offer big solutions to the world's problems?