EconTalk host Russ Roberts is interviewed by long-time EconTalk guest Michael Munger about Russ's new book, How Adam Smith Can Change Your Life: An Unexpected Guide to Human Nature and Happiness. Topics discussed include how economists view human motivation and consumer behavior, the role of conscience and self-interest in acts of kindness, and the costs and benefits of judging others. The conversation closes with a discussion of how Smith can help us understand villains in movies.