Quantitative, contrarian, and nuanced: these are the hallmarks of the Freakonomics approach. Hear journalist and podcaster Stephen Dubner speak with EconTalk's Russ Roberts about the 20th anniversary of the popular-economics book Dubner co-authored with Steven Levitt. They discuss how the book came to be, how the journey changed Dubner's life, and how it changed his thinking about various economics issues. The conversation includes a lengthy discussion on the role of private equity in the American economy, and Roberts's claim that Dubner and co-author Steven Levitt's treatment of incentives overlooks the role of competition and markets.