Nudge is not an instant book. It is the product of more than five years of collaborative work by Cass Sunstein and Richard Thaler. Along the way, both authors took the opportunity to debate and discuss their ideas with a number of prominent economists and legal scholars. In one of those conversations, recorded in 2006, Richard Thaler spoke with Russ Roberts, an economics professor at George Mason University and the host of a podcast called EconTalk. Nudge-lovers interested in a discussion that is a bit more philosophical and technical than some of Thaler’s recent radio interviews can listen to the podcast here. It runs about one hour.