Monopoly Practice Flashcards

This set covers vocabulary and concepts related to monopolies, market power, regulatory measures, and antitrust legislation as presented in Chapter 9.

Monopoly

A market structure characterized by one firm, no close substitutes for the product, significant barriers to entry, substantial market power, and potential for long-run economic profit.

Market Power

The ability of a firm to exercise control over the price of its product; monopolists are considered price makers.

Barriers to Entry

Sources of market power that prevent other firms from entering an industry, including control of key inputs, economies of scale due to large fixed costs, and government protections like patents and copyrights.

Profit Maximization Rule

The principle that monopolies and perfectly competitive firms both maximize profit by producing at the quantity where $MR = MC$.

Marginal Revenue (MR)

The change in total revenue relative to the change in quantity, calculated as \text{MR} = \frac{\text{\Delta TR}}{\text{\Delta Q}}. For a monopolist, $MR < P$ because it must lower the price on all units to sell more.

Monopoly Profit Formula

The calculation used to determine profit, expressed as $(P - ATC) \times \text{Quantity}$.

Deadweight Loss

Market inefficiency created under conditions of monopoly because the price is higher and the output is lower than under competitive conditions.

Rent Seeking

Costly actions, such as lobbying, taken by a firm to avoid or limit competition.

X-inefficiency

A form of waste that occurs when monopolies squander resources on lavish retreats, perks, or other unnecessary expenses.

Price Discrimination

The practice of charging different consumers different prices for the same product, requiring control over price, the ability to separate markets by elasticity, and the prevention of arbitrage.

First-Degree Price Discrimination

A strategy where firms capture all consumer surplus by charging each consumer their maximum willingness to pay.

Second-Degree Price Discrimination

A strategy where firms charge different prices based on the quantity purchased by the consumer.

Third-Degree Price Discrimination

A strategy where firms charge different prices to different groups of consumers based on their specific elasticities of demand.

Natural Monopoly

A monopoly protected by significant economies of scale, making one firm more cost-efficient than multiple firms; examples include utility companies and the U.S. Postal Service.

Average Cost Pricing Rule

A regulation requiring natural monopolies to charge a price no higher than $ATC$, which is higher than the competitive price but lower than the monopoly price.

Rate of Return Regulation

A regulatory approach that sets pricing to allow a firm to earn a normal return on its investment.

Price Caps

Maximum prices that firms are permitted to charge, which are adjusted according to cost conditions.

Sherman Antitrust Act (1890)

Legislation that provides criminal penalties for firms or individuals that attempt to monopolize an industry.

Clayton Antitrust Act (1914)

Legislation that forbids contracts and other arrangements that result in limited competition.

Federal Trade Commission Act (1914)

A law designed to protect consumers from unfair or deceptive business practices.

Concentration Ratio

A measure of market power calculated as the share of total sales accounted for by the largest firms (typically the top four or eight) in an industry.

Herfindahl-Hirschman Index (HHI)

A measure of market concentration used to evaluate mergers, calculated as the sum of the squares of the market share of each firm; it ranges from $0$ to $10,000$.

Highly Concentrated Industry

An industry categorization based on HHI results where the index value is greater than $2,500$.

Contestable Market

An industry where the threat of potential competition is enough to keep prices low, even if there is only one firm currently serving the market.

Monopsony

A term coined by economist Joan Robinson in 1933 to describe industries controlled by one major employer.