Sean Carroll at Preposterous Universe:
Getting along in society requires that we mostly adhere to certainly shared norms and customs. Often it’s not enough that we all know what the rules are, but also that everyone else knows the rules, and that they know that we know the rules, and so on. Philosophers and game theorists refer to this as common knowledge. In Steven Pinker’s new book, When Everyone Knows That Everyone Knows…, he explores how common knowledge (or its absence) explains money, power, and a wide variety of subtextual human interactions.
More here.
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