Chapter 14 Market Structure and Degrees of Market Power

Market Structure and Market Power

Overview of Market Structures

  • Four Market Structures:
    • Perfect Competition
    • Monopolistic Competition
    • Oligopoly
    • Monopoly
  • Key Concept: Market structure shapes the degree of market power a firm has.

Market Power

  • Definition: The ability of a seller to charge a higher price without losing many customers.
  • Influence on Pricing Strategy: Market power defines how companies set their prices based on competition levels.

Types of Market Structures

1. Perfect Competition
  • All businesses sell identical goods.
  • Characteristics:
    • Many buyers and sellers.
    • No single firm has market power; firms are price takers.
  • Examples:
    • Agricultural markets (e.g., corn).
    • Commodity markets (e.g., oil).
    • Stock markets (e.g., shares of Apple).
2. Monopoly
  • A single seller in the market.
  • Characteristics:
    • No close substitutes available.
    • Firms have significant market power; they are price setters.
  • Example: De Beers Diamonds—controlled a major share of the diamond market for years.
3. Oligopoly
  • A market dominated by a few large sellers.
  • Characteristics:
    • Firms hold substantial market power; pricing decisions are interdependent.
    • Products can be similar or differentiated.
  • Example: Cellular service market dominated by AT&T, Verizon, and T-Mobile.
4. Monopolistic Competition
  • Many small businesses selling differentiated products.
  • Characteristics:
    • Each firm has some market power due to product differentiation.
  • Example: Different types of apples and jeans brands differentiate themselves through quality and marketing.

The Spectrum of Market Power

  • Imperfect Competition: Includes monopolistic competition and oligopoly where firms have some market power but not as much as monopolists.

Implications of Market Power

  • Higher Prices: Firms can charge above marginal costs.
  • Smaller Quantity: Market power results in underproduction compared to perfectly competitive outcomes.
  • Larger Profits: Firms with market power can earn larger economic profits.
  • Survival Despite Inefficiency: Firms can operate with high costs without competitive pressure.

Setting Prices with Market Power

  • Demand Curve: Shows how quantity demanded changes at different prices.
  • Marginal Revenue Curve: Reflects the additional revenue from selling one more unit.
  • Optimal Pricing: Set quantity where marginal revenue equals marginal cost and price from the demand curve.

Public Policy Solutions

  • Encouraging Competition:
    • Anti-collusion and merger laws to prevent monopolization.
    • Promote international trade to enhance competition.
  • Minimizing Harm:
    • Implementing price ceilings to control excessively high prices.
    • Regulating natural monopolies.

Key Takeaways

  1. Market structure dictates market power.
  2. Market power allows pricing above marginal costs.
  3. Market power typically results in higher prices and lower quantities.
  4. Government intervention is crucial to maintain competitive markets and limit abuse of market power.