 When agents engage in a sequence of interactions, each of which can be characterized as a single noncooperative game, then they can adopt history-dependent strategies where their actions in any particular iteration of the game depend upon actions taken in prior iterations. Early on, game theorists recognized that when agents engage in games that are repeated indefinitely they can use such strategies to arrive at equilibria that include acts that are never parts of an equilibrium of any of the constituent games that are being repeated. This insight led to a body of results known as the folk theorem that establishes conditions under which a profile of history-dependent strategies will be an equilibrium of an indefinitely repeated game. Sugden (1986) and Skyrms (1998) were among the first to argue that Hobbes’s response to the Foole and Hume’s analysis of promises present proto-folk theorem arguments.