Event Detail

A group commonly knows a proposition just in case all know it, all know that all know it, and so on. A group commonly believes a proposition just in case all believe it, all believe that all believe it, and so on. Common knowledge and common belief have been claimed to play a crucial role in explaining social behavior such as coordination, conventions and an array of conversational phenomena. In this paper, I consider two arguments in favor of the claim that groups of people often commonly know or commonly believe nontrivial propositions. I argue that both of these arguments fail.