 This prisoner’s dilemma is structurally identical to the Mortarmen’s Dilemma of  Figure 1,  but here we interpret the parties’ strategies rather differently. (A, A) is the unique equilibrium of this game that characterizes Laura and Claudia’s particular interaction with one another. However, if we suppose that their interaction is one of an indefinite sequence of similar interactions that they will enter into with each other and other members of their community, then they can follow history-dependent strategies. One such strategy, formulated by Sugden (1986), is the Humean strategy: