Following the conversation, we invite you to join us for a meet-and-greet with the author, book signing and light refreshments.
Topic:
When Everyone Knows That Everyone Knows . . .: Common Knowledge and the Mysteries of Money, Power, and Everyday Life
 
(Scribner, September 23, 2025)
Speaker:
Steven Pinker, 
Johnstone Professor of Psychology, Harvard University
Moderator:
Dilip Soman, 
Professor of Marketing, Academic Director, Evening MBA & EMBA Programs & Canada Research Chair in Behavioural Science and Economics, Rotman School of Management
Book Synopsis:
From one of the world’s most celebrated intellectuals, a brilliantly insightful work that explains how we think about each other’s thoughts about each other’s thoughts, ad infinitum. It sounds impossible, but Steven Pinker shows that we do it all the time. This awareness, which we experience as something that is public or “out there,” is called
 
common knowledge
, and it has a momentous
 
impact on our social, political, and economic lives
.
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.
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 filled with ads for 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?
Consistently riveting in explaining the paradoxes of human behavior, 
When Everyone Knows That Everyone Knows…
 invites us to understand the ways we try to get into each other’s heads and the harmonies, hypocrisies, and outrages that result.
About the speaker:
Steven Pinker
 is the Johnstone Professor of Psychology at Harvard University. He has won many prizes for his teaching, his research on language, cognition, and social relations, and his twelve books, including 
The Language Instinct
, 
How the Mind Works
, 
The Better Angels of Our Nature
, and 
Rationality.
 He is an elected member of the National Academy of Sciences, a two-time Pulitzer Prize finalist, and one of 
Time
’s “100 Most Influential People in the World Today.”
About the moderator:
Dilip Soman
 is a Professor of Marketing and the Academic Director, Evening MBA & EMBA Programs. He is also a Canada Research Chair in Behavioural Science and Economics, and was the former Director of the Behavioural Economics in Action Research Centre at Rotman [BEAR]. His research is in the area of behavioural science and its applications to consumer wellbeing, marketing and policy. He is the author of "The Last Mile" [University of Toronto Press] and teaches a massive open online course [MOOC] "BE101X: Behavioural Economics in Action" on EdX.
Event Logistics:
This event is available to attend in-person only. Rotman Events is committed to accessibility for all people. If you have any access needs or if there are any ways we can support your full participation in this session, please email [events@rotman.utoronto.ca] no later than 2 weeks in advance of the event and we will be glad to work with you to make the appropriate arrangements.
General Admission: In-Person + Book Ticket Details
The event will be hosted in Desautels Hall at the Rotman School of Management (
105 St. George St., Toronto, ON M5S 3E6
). Your registration fee includes a copy of the book, meet-and-greet with book signing by the author, light refreshments.
Cancellation & Refund Policy
Refunds will only be issued for cancellations received in writing NO LATER than 24 hours prior to the event. Please email events@rotman.utoronto.ca for processing.
Questions: events@rotman.utoronto.ca
Information Source: Rotman Events | eventbrite

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