1. KRUGMAN'S MICROECONOMICS for AP* Oligopoly in Practice Margaret Ray and David Anderson Micro: Econ: 30 66 Module

2. What you will learn in this Module : The legal constraints of antitrust policy. The factors that limit tacit collusion. The causes and effects of price wars, product differentiation, price leadership, and nonprice competition. The importance of oligopoly in the real world.

3. Antitrust Legislation Laws including the Sherman Act and the Clayton Act make cartels, collusion, and certain anti-competitive business practices illegal

4. Factors Limiting Tacit Collusion Large numbers The more firms in the industry, the less likely tacit collusion will be successful Complex products and pricing schemes It is easier to tacitly agree to keep a price high if the product is simple and there are few ways price can be set. Differences in interests If firms have diverse characteristics and interests, it will be more difficult to establish and maintain tacit agreements. Bargaining powers of buyers If the buyers of a product have bargaining power, or they operate in a competitive retail environment, tacit agreements to keep prices high are unlikely to succeed. Sca

5. Product Differentiation and Tacit Collusion Product differentiation Price leadership Non-price competition

6. How Important is Oligopoly? Prevalence in the “real world” Difficulty of modeling oligopoly firm behavior