More than 700 million people across the globe live on extremely low wages. This year, a trio of economists won the Nobel Prize for their work on addressing global poverty, using randomized control trials to test and improve social policy. Economics correspondent Paul Solman talks to two of those winners, husband-and-wife duo Abhijit Banerjee and Esther Duflo, about their work. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders