“At bottom, I’m not all that interested in money,” Michael Lewis tells Planet Money:
It’s peculiar that I’ve written financial books and worked on Wall Street. … I’m interested in something else, and I guess that other thing is character and action and the general drift of societies. Money, because people care so much about it … is this great prism through which to view people.
On NPR’s Planet Money, they talk about the long arc of Lewis’s work.