 Many of the early applications of game theory to ethics were limited to contractarian theories and work exploring the relationship between morality and rationality. It has increasingly come to be an important tool in the study of applied problems in moral and political philosophy, though, and this promises to become even more true as the number of scholars working on issues at the intersection of philosophy, politics, and economics increases. That said, game theory remains an important tool for analyzing the function of morality and for identifying some of its necessary features. And new contributions to the social contract tradition continue to be made using ever more sophisticated applications of game theoretic tools.