Market Structure 2: Monopoly and Imperfect Competition

Introduction to Imperfect Competition

• Imperfect competition is defined as a market situation in which at least one of the conditions for perfect competition is not satisfied.

• There are two broad categories of imperfect competition:

  • Oligopoly.

  • Monopolistic competition.

• Market structures exist on a spectrum defined by the degree of competition:

  • Perfect Competition: Maximum degree of competition.

  • Monopolistic Competition: High degree of competition.

  • Oligopoly: Moderate degree of competition.

  • Monopoly: Zero degree of competition.

Monopoly (Section 11.1)

• A pure monopoly is a market structure characterized by a single seller of a good or service that has no close substitutes, and entry to the market is completely blocked.

• Pure monopolies are considered relatively rare in the real world.

• Monopoly represents the opposite extreme to perfect competition on the market structure spectrum.

Barriers to Entry

• Key barriers that prevent new firms from entering a monopolistic market include:

  • Natural monopoly and economies of scale.

  • Limited size of the market.

  • Exclusive ownership of raw materials.

  • Patents.

  • Licensing.

  • Sole rights.

  • Import restrictions.

  • Firm-created barriers, such as predatory pricing and the maintenance of excess capacity.

Revenue and Equilibrium for a Monopolist

• Unlike a perfectly competitive firm, a monopolist faces a downward-sloping demand curve, which represents the entire market demand.

• The relationship between Total Revenue ($TR$), Average Revenue ($AR$), and Marginal Revenue ($MR$) is as follows:

  • $MR$ is always lower than $AR$ when the firm’s demand curve slopes downward.

  • If the $AR$ curve is a straight line, the $MR$ curve lies exactly halfway between the price axis and the $AR$ curve.

• Short-Run Equilibrium: The monopolist maximizes profit at the output level where $MR = MC$ (Marginal Revenue equals Marginal Cost), provided price ($P$) is greater than or equal to Average Variable Cost ($AVC$).

• Long-Run Equilibrium: The long-run cost curve of a monopoly is essentially the same as the short-run curve, but the firm will specifically produce where $MR = \text{long-run } MC$.

• Supply Curve Note: A monopolist does not have a traditional supply curve. There is no unique relationship between price and the quantity supplied because the quantity supplied depends on the shape of the demand and marginal revenue curves.

Price Discrimination

• Price discrimination is the practice of selling different units of a good or service for different prices, or charging a specific customer different prices based on the quantities purchased.

• Purpose: To capture all or part of the consumer surplus or to increase total sales.

• Required Conditions:

  • The firm must be a price maker or price setter.

  • Consumers or markets must be independent (no possibility of arbitrage/resale).

• Varieties of Price Discrimination:

  • First-degree price discrimination.

  • Second-degree price discrimination.

  • Third-degree price discrimination.

Natural Monopoly

• A natural monopoly arises when it is most cost-efficient for a single firm to produce all the output in an industry or market due to significant economies of scale.

• Because natural monopolies can lead to inefficiency or high prices, government intervention is often necessary.

• Government Strategies for Natural Monopolies:

  • Direct Supply: The government supplies the good or service itself and uses tax revenue to compensate for losses (utilizing marginal cost pricing).

  • Subsidization: The government allows production by a private firm but subsidizes its losses if marginal cost pricing is enforced.

  • Average Cost Pricing: An alternative pricing strategy where the price is set equal to the average cost to eliminate economic profit without requiring a subsidy.

  • Price Discrimination: Allowing the firm to charge different prices to different segments to cover costs.

Monopolistic Competition (Section 11.2)

• A monopolistically competitive market involves a large number of firms producing similar but slightly different (heterogeneous) products.

• Product Differentiation:

  • Products are heterogeneous rather than homogeneous.

  • Firms engage in both price competition and non-price competition (such as advertising).

• Entry and Exit: Unlike a monopoly, entry into a monopolistically competitive market is not restricted.

• Equilibrium:

  • In the short run, the equilibrium of a monopolistic competitor is identical to that of a monopolist ($MR = MC$).

  • In the long run, because entry is free, new firms entering the market will erode economic profits until only normal profit is earned.

Oligopoly (Section 11.3)

• An oligopoly is a market structure dominated by a few large firms. A duopoly is a specific type of oligopoly where only two firms exist.

• Main Features:

  • High degree of interdependence between firms.

  • Market uncertainty regarding rival behavior.

  • Significant barriers to entry.

• Broad Strategies:

  • Collusion: Firms cooperate to set prices or output levels (e.g., cartels).

  • Competition: Firms compete actively, often through non-price means.

Collusion and Cartels

• Success in collusion is more likely under certain conditions:

  • Small number of firms.

  • Similar production methods and homogeneous products.

  • Significant barriers to entry.

  • A stable market environment.

  • No government intervention.

Non-Price Competition

• Non-price competition involves using characteristics other than price to attract customers, including:

  • Technical differences.

  • Brand identity.

  • Packaging.

  • Location.

  • Customer service.

• Advertising is a primary form of non-price competition used to promote brand loyalty.

Game Theory

• Because oligopolists are interdependent, their behavior is often analyzed using Game Theory.

• Key concepts include:

  • Dominant Strategy: A strategy that is best for a player regardless of what the opponent chooses.

  • Dominant Equilibrium: An outcome where all players follow their dominant strategy.

  • Nash Equilibrium: A situation where each player chooses their best strategy given the strategies chosen by others.

  • Prisoners’ Dilemma: A standard example in game theory showing why two completely rational individuals might not cooperate, even if it appears in their best interest to do so.

Comparative Analysis of Market Structures (Section 11.4)

Monopoly vs. Perfect Competition

• If an industry is a monopoly rather than perfectly competitive:

  • The price will generally be higher.

  • The output will generally be lower.

  • It is considered an inefficient market structure resulting in a deadweight loss of welfare (social costs of monopoly power).

• Popular Misconceptions: It is false that a monopolist can charge "virtually any price," is "guaranteed an economic profit," or has "absolute economic power."

• Case Against Monopoly/Bigness:

  • Managerial inefficiency and $X$-inefficiency.

  • Lack of incentive for innovation.

  • Questionable product/service quality.

  • Socially unacceptable distribution of wealth.

  • Rent-seeking behavior.

Monopolistic Competition vs. Perfect Competition

• Monopolistic competition is characterized by an inefficient use of resources compared to perfect competition; consumers pay higher prices for lower output.

• Advantages of Monopolistic Competition:

  • Provides a wider range of product choices, which consumers generally value.

  • Provides incentives for firms to develop new varieties and improve products.

Oligopoly vs. Perfect Competition

• Active Competition: Oligopolistic competition is more active and intense, whereas perfect competition is passive.

• Research and Development (R&D): Oligopolists have a considerable incentive to engage in R&D to gain advantages over rivals.

• Countervailing Power: This occurs when powerful oligopolistic sellers deal with powerful oligopolistic buyers, potentially resulting in lower prices.

Policy Regarding Monopoly and Imperfect Competition (Section 11.5)

• Types of Intervention:

  • Levying taxes to reduce excess profits.

  • Government ownership of industry.

  • Regulation of prices or quality.

  • Competition policy.

Competition Policy

• Competition policy in South Africa and elsewhere has three basic aims:

  • Monopoly Policy: To prevent existing monopolies or powerful firms from abusing their market power.

  • Merger Policy: To regulate market power growth resulting from mergers and acquisitions.

  • Restrictive Practice Policy: To prevent restrictive trade practices, particularly by oligopolistic firms (e.g., price-fixing).