The Third Edition continues to supply the building blocks of microeconomic analysis: a thorough treatment of optimization and equilibrium methods, coupled with numerous examples of their application. The Third Edition expands on the earlier editions in two ways. First, the coverage has been rewritten and rearranged. Second, chapters have been added on game theory, oligopoly, asset markets, and information economics. The new chapters fully update the text, highlighting significant developments of the last decade at a level that is accessible for first-year graduate students.