ESTHER DUFLO: What made it very clear to me at this, what it made very clear to me at this stage is that you have to go to the field, because if you want to study issues of global poverty, in India or in Kenya or in Ghana or in Madagascar, there is no substitute for going to India or Ghana or Kenya or Madagascar because our intuition from the comfort of our offices and our lives here on how people live their lives on the ground are just mostly worthless. CURT NICKISCH: In your new book, Good Economics for Hard Times, that you wrote along with your fellow, your fellow Nobel winner, Abhijit Banerjee, you argue that the lessons from your research in developing nations, you know, that rigorous experimentation and clearheaded economic policy can have surprising gains.