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Lewis: Convention

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Lewis. 1969. Convention: A Philosophical Study. Cambridge: Harvard University Press.

A Convention: some regularity (R) that everybody adheres to when they are in recurring situation (S) if (and only if) everyone knows that, when S happens: (1) everyone conforms to R; (2) everyone expects everyone else to conform to R; (3) everyone prefers to conform to R as long as everyone else does, since S is a coordination problem and R is a coordination equilibrium. (58)