Monopoly

Introducing a New Market Structure

Monopoly represents a market structure where a single firm is the sole seller of a good or service with no close substitutes. Unlike perfectly competitive markets, where firms are price-takers, a monopolist is a price-maker, meaning it has the power to set prices due to the absence of competition.

• Price Maker: A seller that can set the price of a good.

• Market Power: The ability to influence or set the price in the market.

• Monopoly: A market with one seller and no close substitutes for the product.

Example: Utility companies in many regions are monopolies due to the high cost of infrastructure and lack of competition.

Sources of Market Power

Market power arises from barriers to entry, which prevent new firms from entering the market and competing with the monopolist. These barriers can be legal or natural.

• Legal Market Power: Arises from government actions such as patents and copyrights.

• Natural Market Power: Results from control of key resources or economies of scale.

• Control of Key Resources: When a firm owns essential materials for production (e.g., De Beers and diamonds).

• Economies of Scale: When a single firm can supply the entire market at a lower cost than multiple firms, leading to a natural monopoly.

• Network Externalities: The value of a product increases as more people use it (e.g., social media platforms).

Example: Turing Pharmaceuticals raised the price of Daraprim due to regulatory barriers that delayed competitors from entering the market.

The Monopolist’s Problem

Monopolists, like competitive firms, must understand their production costs and how inputs combine to produce outputs. However, unlike competitive firms, monopolists face the market demand curve directly and must consider how changing output affects price and revenue.

• Demand Curve: The monopolist faces a downward-sloping market demand curve.

• Marginal Revenue (MR): The additional revenue from selling one more unit. For monopolists, MR is less than price due to the price effect.

• Price Effect: Lowering the price increases quantity sold but decreases revenue on units that could have been sold at a higher price.

• Quantity Effect: Selling more units increases revenue.

Example: If a monopolist lowers the price from $5 to $4 to sell more units, it gains revenue from extra sales but loses revenue on units that could have been sold at the higher price.

Choosing the Optimal Quantity and Price

To maximize profit, a monopolist produces the quantity where marginal revenue equals marginal cost (MR = MC), then sets the highest price consumers are willing to pay for that quantity.

• Profit Maximization Rule: Produce where MR = MC.

• Pricing: Set price according to the demand curve at the profit-maximizing quantity.

• Comparison: In perfect competition, P = MR = MC; in monopoly, P > MR = MC.

• No Supply Curve: A monopolist does not have a supply curve because it is a price maker, not a price taker.

Formula:

The “Broken” Invisible Hand: The Cost of Monopoly

Monopoly leads to inefficiency in the market, as the monopolist restricts output and raises prices compared to perfect competition. This results in deadweight loss, where potential gains from trade are not realized.

• Consumer Surplus: Reduced under monopoly due to higher prices and lower output.

• Producer Surplus: Increased for the monopolist but not enough to offset the loss in consumer surplus.

• Deadweight Loss: The loss of total surplus due to monopoly pricing.

Restoring Efficiency

Monopolists may use price discrimination to increase profits and potentially reduce deadweight loss. Price discrimination involves charging different prices to different consumers based on their willingness to pay.

• First-Degree (Perfect) Price Discrimination: Each consumer is charged their maximum willingness to pay.

• Second-Degree Price Discrimination: Prices vary according to the quantity purchased or product version.

• Third-Degree Price Discrimination: Prices differ based on customer characteristics (e.g., age, location).

Examples:

• First-degree: Car sales, auctions

• Second-degree: Bulk discounts, utility pricing

• Third-degree: Student or senior discounts, regional pricing

Government Policy Toward Monopoly

Governments intervene to prevent the negative effects of monopoly through antitrust laws and regulation.

• Antitrust Policy: Laws and regulations to prevent anti-competitive practices and promote market competition.

• Sherman Act (1890): Prohibits monopolization and anti-competitive agreements.

• Price Regulation: Setting prices to achieve efficient (P = MC) or fair-return (P = ATC) outcomes.

Example: The U.S. government’s case against Microsoft for bundling its browser with Windows to limit competition.

Evidence-Based Economics: Can a Monopoly Ever Be Good for Society?

While monopolies often reduce efficiency, they can sometimes benefit society by encouraging innovation, especially when patents reward firms for developing new products. The strongest case for monopoly benefits arises in industries where innovation is crucial and competition can quickly erode profits.

• Innovation Incentives: Patents can encourage research and development by granting temporary monopoly power.

Practice Problem: Monopoly vs. Competition

Consider the allergy drug Claritin with a constant marginal cost of $5 per dose.

1. Competitive Market: With many firms, equilibrium price equals marginal cost ($5), maximizing consumer and producer surplus.

2. Monopoly: With a patent, Claritin sets MR = MC to find the profit-maximizing quantity and price, resulting in higher prices and lower output than competition.

3. Surplus Comparison: Monopoly reduces consumer surplus and creates deadweight loss, but may increase producer surplus.

Formulas:

Additional info: This summary expands on the textbook outline by providing definitions, examples, and formulas relevant to monopoly, market power, and government policy, as well as the implications for efficiency and innovation.