Game Theory or Interactive Decision Theory is a theory that seeks to describe the behaviour of motivated, intelligent decision makers and the results of the interaction of such decision makers. It is the basis of much of modern economic theory and of the rational approach in political science, as well as significant parts of law, biology, engineering, and philosophy. It is a formal theory and in many parts uses, and requires, sophisticated mathematics. However, in comparison to other parts of economics, it can also be quite concrete. Thus, for this course, while there is a strong formal component that is mathematical, the mathematics is kept to a relatively low level. A reasonable command of high school algebra and a willingness to think somewhat abstractly is sufficient. The course is taught in a traditional lecture style but most learning will result from students completing the assigned problems. Each week there are assigned recordings for students to watch and a set of exercises that should be attempted prior to class meetings where students can ask for further explanation and will be expected to contribute to discussion of the recorded material and the exercises. Exercises are to be handed in at the first class of the week and will be graded on a 0, 1, 2, 3 scale. (3: all exercises attempted and mostly right, 2: most exercises attempted and many right, 1: less than that, 0: exercises not submitted that week.) Marks will be available promptly but exercises will not be returned. Students should keep a copy of their answers and be ready to present answers in class and participate in class room discussion of the exercises. Students will be called on by name to make presentations or add comments. All students are expected to attend all classes. If you cannot attend class you cannot take this course.