Game theory is a fascinating and interdisciplinary field which analyzes situations in which individuals must choose among several different actions to achieve the best possible outcome. Originally developed as a tool in economics, game theory is now used in many different disciplines, including politics, psychology, biology, ecology and philosophy, as well as in the analysis of standard recreational games. In this course, we will explore the fundamental ideas of non-cooperative and cooperative game theory and some of their many applications, including the Prisoner’s Dilemma and its relationship to the Cold War, the free rider dilemma, evolutionary game theory, the Nash bargaining solution, and the Shapley value for allocating resources and measuring power in simple games. We will also look at the role of game theory in voting. Social choice theory asks: are there reasonable and fair ways to select a president; measure the power that individuals have within organizations; or divide up assets in a divorce settlement. Arrow’s famous Impossibility Theorem says that it is impossible to design an election system that is fair all the time. We will discuss whether this is true and compare the fairness of different voting methods. **Students must register for both the lecture and discussion section of this course.** [This ULEC is in category 1, Tools for Social Change.]