101-Chapter 17 (1)

Introduction to Oligopoly

  • Textbook: Principles of Microeconomics, Eighth Canadian Edition by Mankiw/Kneebone/McKenzie adapted for the Eighth Canadian Edition by Marc Prud’Homme.

Definition of Oligopoly

  • Oligopoly: A market structure with only a few sellers.

    • Each seller's actions significantly impact others in the market.

    • The chapter aims to explore interdependence among firms in oligopoly and its implications for behavior and public policy.

Key Concepts

Market Structure Characteristics

  • Oligopolistic Market: Few sellers offering similar or identical products.

  • Game Theory: The study of strategic decision-making among competing participants.

Dynamics in Oligopoly

  • Key features include:

    • Tension between cooperation and self-interest.

  • Example: A duopoly scenario (Jack and Jill) where decisions can impact market dynamics significantly.

Duopoly Example

  • Scenario: Jack and Jill, two sellers of water.

    • Each must decide on the quantity to sell, maximizing profits based on market conditions.

  • Marginal Cost (MC): Assumed zero in this example.

Demand and Pricing

Demand Schedule for Water (Table 17.1)

  • Pricing based on quantity sold:

    • From 0 L (Price $120) to 120 L (Price $0).

    • Total Revenue varies with quantity sold.

  • Perfect Competition Outcome: Price = MC, equilibrium quantity = 120 L.

  • Monopoly Outcome: Profit maximized at 60 L (Price $60), leading to inefficiency.

Strategies and Outcomes

Collusion and Cartels

  • Collusion: Agreement among firms regarding production quantities/prices.

  • Cartel: A group of firms that act in unison to maximize profits.

    • Example: Jack and Jill agreeing to produce 30 L each leading to a monopolistic outcome.

Individual Decision-Making in Duopoly

  • Jack and Jill may independently decide quantities:

    • Each relies on expectations of the other's production decision.

    • An equilibrium can emerge from their individual strategic choices.

Nash Equilibrium

  • Defined as the state where each economic actor selects strategies that yield optimal results, given others' choices.

  • Oligopoly results in output greater than a monopoly yet lower than in a competitive market.

Impact of Oligopoly Size

Market Outcome Dynamics

  • As the number of sellers increases:

    • Less concern about impacts on market price.

    • Moves towards characteristics of competitive markets (Price approaches MC).

Game Theory and Economics of Cooperation

Prisoners’ Dilemma

  • Illustrates challenges of maintaining cooperation in oligopolies:

    • Example: Bonnie and Clyde scenario.

    • Both confess while pursuing self-interest, leading to a worse collective outcome.

Dominant Strategy

  • Defined as a preferred strategy for players, regardless of others' actions.

  • Outcome of the Dilemma: Both participants end up with longer sentences due to lack of cooperation.

Implications for Oligopolies

  • Oligopolistic pricing behavior is akin to the prisoners’ dilemma.

  • Self-Interest vs. Collective Benefit: Each firm tempted to cheat on collusion leads to suboptimal outcomes.

Public Policy Considerations

Legal and Ethical Regulations

  • Competition Act: Prohibits trade restraints and price-fixing, promoting healthy competition.

  • Enforcement against negative practices like bid-rigging and predatory pricing is crucial.

Conclusion

  • Understanding oligopolies through the lens of game theory provides insights into firm behavior and potential regulatory measures.

  • The challenge remains in achieving cooperation among firms for societal benefit.