There's been a lot of discussion throughout the day-and-a-half that we've been here about the lack of data. We've heard a lot of questions raised. Some are old hat. Some are new. I want to talk about findings. They're findings from studies, some by me, from general purpose surveys that have been collected in the last decade or so in low-income countries. The growth of these general purpose surveys from low-income countries has, in my view, revolutionized development economics.