Monopoly

Definition and Characteristics

A monopoly is a market structure in which a single firm is the sole producer of a product with no close substitutes, and significant barriers to entry prevent other firms from entering the market.

• One firm in the industry: The monopolist is the only supplier.

• No close substitutes: Consumers cannot easily switch to another product.

• Barriers to entry: High obstacles prevent new competitors from entering.

• Examples: De Beers (diamonds), YKK (zippers).

• Most real-world markets fall between pure monopoly and perfect competition.

How Do Monopolies Form?

Sources of Monopoly Power

Monopolies arise due to several factors that restrict competition and allow a single firm to dominate the market.

• Government Blocking Entry: Legal restrictions such as patents, copyrights, and public franchises.

• Patents: Exclusive rights to produce and sell an invention for 20 years. Example: Pharmaceutical patents.

• Copyrights: Government-granted exclusive rights to creative works, incentivizing research and development.

• Public Franchise: Government grants a firm exclusive rights to provide a service (e.g., USPS, utilities, lotteries) for reasons of efficiency, fairness, and control.

• Control of a Key Resource: Ownership of essential inputs (e.g., De Beers' diamond mines, Alcoa's bauxite mines).

• Network Externalities: Product value increases as more people use it (e.g., Facebook, Microsoft Office, PDF format).

• Natural Monopolies: Large economies of scale make it efficient for only one firm to supply the market (e.g., utilities).

All these factors allow firms to be price makers rather than price takers.

How Much to Charge & How Many to Produce?

Monopoly vs. Perfect Competition

Unlike perfectly competitive firms, monopolists face a downward-sloping demand curve and must consider the impact of price changes on quantity sold.

• Perfect Competition: Firms are price takers; price equals marginal revenue and average revenue ().

• Monopoly: The firm is the industry; faces downward-sloping demand ().

Demand Curve, Average Revenue, & Marginal Revenue for a Monopolist

Revenue Relationships

For a monopolist, the demand curve also represents average revenue, but marginal revenue is always less than price.

• Demand Curve (): Shows the relationship between price and quantity demanded.

• Average Revenue (): Equal to price ().

• Marginal Revenue (): The additional revenue from selling one more unit; for a monopolist.

• To sell more units, the monopolist must lower the price, causing to fall faster than .

Additional info: This table illustrates how marginal revenue falls below price as output increases.

Profit Maximization for a Monopolist

Short Run and Long Run Decisions

The monopolist maximizes profit by producing the quantity where marginal revenue equals marginal cost ().

• Step 1: Find such that .

• Step 2: Use the demand curve to find the corresponding price .

• Step 3: Stay in the short run if ; exit otherwise.

• Step 4: Profit is calculated as .

Equation:

Example: If , , , then

In the long run, if entry is blocked, the monopolist can continue earning positive profits.

Monopolist & Economic Efficiency

Comparison with Perfect Competition

Monopolies are generally less efficient than perfectly competitive markets.

• Allocative Efficiency: Achieved when (perfect competition); not achieved in monopoly ().

• Productive Efficiency: Achieved at the lowest point of average total cost (ATC) in the long run (perfect competition); not achieved in monopoly.

Losses in Economic Surplus Due to Monopoly

Deadweight Loss and Market Power

Monopoly leads to a reduction in total economic surplus due to higher prices and lower output compared to perfect competition.

• Consumer Surplus (CS): Decreases under monopoly.

• Producer Surplus (PS): May increase, but overall economic surplus (ES) decreases due to deadweight loss (DWL).

• Harberger's Perspective: Efficiency loss from monopoly is small if market power is limited; less than 1% of GDP per person if all industries were perfectly competitive.

• Schumpeter's Perspective: Market power can benefit technological progress and innovation, though higher prices are a cost for new products.

Government Policy Toward Monopoly

Antitrust Laws and Regulation

Governments use antitrust laws and regulations to limit monopoly power and promote competition.

• Collusion: Agreements among firms to fix prices or restrict competition are illegal.

• Sherman Act (1890): Prohibited restraint of trade, price fixing, and monopolization.

• Clayton Act (1914): Restricted anti-competitive practices such as buying stock in competitors.

• Federal Trade Commission Act (1914): Established the FTC to monitor and prevent unfair competition.

• Robinson-Patman Act (1936): Prohibited discriminatory pricing practices.

• Celler-Kefauver Act (1950): Made mergers that reduce competition more difficult.

Mergers

• Horizontal Mergers: Between firms in the same industry (e.g., Dell & Apple computers).

• Vertical Mergers: Between firms at different stages of production (e.g., Apple computers & HP printers).