The first part of this course presents the core concepts underlying the microeconomic theory of firm behavior: production functions and costs, cost minimization, and profit maximization. The first part of the course also provides the mathematical tools necessary for solving the ‘firm's economic problem’. The second part of the course explores the behavior of firms in perfect competition, monopoly, monopolistic competition, and oligopoly. After revisiting the behavior of the consumer (ECON 209), the third part of this course presents a general equilibrium model.