When leaders violate norms without consequence, shared “common knowledge” fractures. Media silos and social segregation also deepen polarization by erasing a common civic reality. Full video: https://youtube.com/watch?v=mTQsOBLEIV8 For more on common knowledge, see my new book: When Everyone Knows That Everyone Knows . . .: Common Knowledge and the Mysteries of Money, Power, and Everyday Life | Steven Pinker
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