13: Module 10: Monopolistic Competition and Oligopoly Last updated Save as PDF Page ID48264 13.10: Introduction to Oligopolies13.11: Why do Oligopolies Exist?13.12: Collusion or Competition?13.13: Prisoner’s Dilemma13.14: Learn By Doing: Prisoner’s Dilemma13.15: Putting It Together: Monopolistic Competition and Oligopoly13.16: Discussion: Oligopoly13.17: Assignment: Grocery Competition13.18: Assignment: Problem Set—Monopolistic Competition and Oligopoly13.1: Why It Matters: Monopolistic Competition and Oligopoly13.2: Introduction to Monopolistically Competitive Industries13.3: Monopolistic Competition13.4: Introduction to Analyzing and Graphing Monopolistic Competition13.5: Profit Maximization under Monopolistic Competition13.6: Learn By Doing: Profit Maximization Under Monopolistic Competition13.7: Entry, Exit and Profits in the Long Run13.8: Monopolistic Competition and Efficiency13.9: Product Differentiation and Advertising