 Thomas Schelling (1960), David Lewis (1969), Edna Ullmann-Margalit (1977), Robert Sugden (1986) and, more recently, Peyton Young (1993), Cristina Bicchieri (1993), and Peter Vanderschraaf (1995) have proposed a game-theoretic account according to which a norm is broadly defined as an equilibrium of a strategic interaction. In particular, a Nash equilibrium is a combination of strategies (one for each individual), such that each individual’s strategy is a best reply to the others’ strategies. Since it is an equilibrium, a norm is supported by self-fulfilling expectations in the sense that players’ beliefs are consistent, and thus the actions that follow from players’ beliefs will validate those very beliefs. Characterizing social norms as equilibria has the advantage of emphasizing the role that expectations play in upholding norms. On the other hand, this interpretation of social norms does not prima facie explain why people prefer to conform if they expect others to conform.