Steven Pinker on Common Knowledge

In this episode of EconTalk, Russ Roberts interviews cognitive psychologist Steven Pinker about his book, "When Everyone Knows That Everyone Knows," which explores the concept of common knowledge and its role in coordination, cooperation, and everyday life. Pinker discusses the psychological aspects of common knowledge, contrasting coordination and cooperation, and how common knowledge helps solve coordination problems. The conversation touches on game theory, the importance of credible commitment, and the emergence of norms and conventions to overcome these problems. They delve into examples such as the Super Bowl ads, the tragedy of the commons, and the role of religion in enforcing compliance. The discussion extends to laughter, crying, and the reasons why people often don't say what they mean directly, as well as the state of universities and freedom of speech.