Facebook may be considering an ad-free subscription model that would let you pay to opt out of sharing your habits and personal information. But that raises the question: Why should we pay Facebook not to take our information instead of the other way around? A new book, called “Radical Markets: Uprooting Capitalism and Democracy for a Just Society,” suggests that all of us are working as unpaid data laborers. Glen Weyl, one of the authors and a principal researcher at Microsoft, spoke about the topic with Marketplace’s Molly Wood.