 Game theory is the study of interdependent choice and action. It includes the study of strategic decision making, the analysis of how the choices and decisions of a rational agent depend on (or should be influenced by) the choices of other agents, as well as the study of group dynamics, the analysis of how the distribution of strategies in a population evolves in various contexts and how these distributions impact the outcomes of individual interactions. It should be distinguished from  decision theory,  the study of individual choice in contexts where the agent is choosing independently of other agents, and from  social choice theory,  the study of collective decision making. Our focus will be on the relevance of game theory to ethics and political philosophy. For a thorough discussion of game theory and its relevance to other areas of philosophy see the entry on  game theory.