Market Structure - Imperfect Competition II

Summary and Exam Tips for Market Structure - Imperfect Competition II

Market Structure - Imperfect Competition II is a subtopic of Microeconomics, which falls under the subject Economics in the IB DP curriculum. This section delves into the intricacies of monopolistic competition and oligopoly. In monopolistic competition, numerous firms exist with low barriers to entry, and products are differentiated, leading to a demand curve that is more elastic than a monopoly but less than perfect competition. Firms can make abnormal profits in the short run, but in the long run, they earn normal profits as price equals average cost ($P = AC$). However, they do not achieve allocative efficiency ($P > MC$), resulting in welfare loss.

Oligopolies are characterized by a few large firms with high barriers to entry and significant interdependence. They can be collusive, where firms agree to limit competition, or non-collusive, where firms independently set prices but are influenced by rivals' actions. The kinked demand curve explains price rigidity in non-collusive oligopolies. Game theory, particularly the prisoner's dilemma, illustrates strategic behavior and interdependence in oligopolies. Both market structures exhibit allocative inefficiency, leading to market failure.

Exam Tips

• Understand Key Concepts: Be clear on the characteristics of monopolistic competition and oligopoly, including product differentiation and market concentration ratios.
• Diagram Mastery: Practice drawing and interpreting diagrams for monopolistic competition and oligopoly, focusing on short-run and long-run scenarios.
• Game Theory: Familiarize yourself with basic game theory concepts, especially the prisoner's dilemma, to explain strategic behavior in oligopolies.
• Efficiency Analysis: Be prepared to discuss allocative inefficiency and welfare loss in both market structures, using diagrams to support your explanation.
• Real-World Examples: Use real-world examples to illustrate concepts like collusive and non-collusive oligopolies, enhancing your answers with practical insights.