Common knowledge is necessary for coordination, for making arbitrary but complementary choices like driving on the right, using paper currency, and coalescing behind a political leader or movement. It’s also necessary for social coordination: everything from rendezvousing at a time and place to speaking the same language to forming enduring relationships of friendship, romance, or authority. Humans have a sixth sense for common knowledge, and we create it with signals like laughter, tears, blushing, eye contact, and blunt speech. But people also go to great lengths to avoid common knowledge—to ensure that even if everyone knows something, they can’t know that everyone else knows they know it. And so we get rituals like benign hypocrisy, veiled bribes and threats, sexual innuendo, and pretending not to see the elephant in the room. In When Everyone Knows That Everyone Knows…: Common Knowledge and the Mysteries of Money, Power, and Everyday Life (Scribner, 2026) Pinker shows how the hidden logic of common knowledge can make sense of many of life’s enigmas: financial bubbles and crashes, revolutions that come out of nowhere, the posturing and pretense of diplomacy, the eruption of social media shaming mobs and academic cancel culture, the awkwardness of a first date. Artists and humorists have long mined the intrigues of common knowledge, and Pinker liberally uses their novels, jokes, cartoons, films, and sitcom dialogues to illuminate social life’s tragedies and comedies. Along the way he answers questions like: -Why do people hoard toilet paper at the first sign of an emergency? -Why are Super Bowl ads dominated by crypto? -Why, in American presidential primary voting, do citizens typically select the candidate they believe is preferred by others rather than their favorite? -Why did Russian authorities arrest a protester who carried a blank sign? -Why is it so hard for nervous lovers to say goodbye at the end of a phone call? -Why does everyone agree that if we were completely honest all the time, life would be unbearable? Steven Pinker is the Johnstone Professor of Psychology at Harvard University. Renee Garfinkel, Ph.D. is a psychologist, writer, Middle East television commentator, and host of the New Books Network’s Van Leer Jerusalem Series on Ideas. Write her at reneeg@vanleer.org.il. She's on Twitter @embracingwisdom. She blogs here and also contributes here. Learn more about your ad choices. Visit megaphone.fm/adchoices Support our show by becoming a premium member! https://newbooksnetwork.supportingcast.fm/psychology
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