This is a course on the theory of industrial organization. The key questions of this field include: How do the ways in which a market is organized affect firms' behavior? And, how does the behavior of firms affect the structure of markets and market outcomes? Our primary approach to addressing these questions will be the analysis of formal theoretical models. The formal pre-requisite is ECON 401, Intermediate Microeconomic Theory. We will make extensive use of the game theoretical concepts introduced therein. This course is much more rigorous than Intermediate Microeconomics. All students should be comfortable using basic calculus. We will not use a great deal of math, but we will use a little math a great deal. Course assignments will include problem sets, a midterm and a final exam. The waitlist is managed according to standard departmental practice.