Chapter 15: Monopoly

This set of vocabulary flashcards covers the fundamental concepts of monopolies, including reasons for their existence, pricing strategies, profit maximization, welfare effects, and public policy responses as discussed in Chapter 15.

Monopoly

A firm that is the sole seller of a product without close substitutes, acting as a price maker due to barriers to entry.

Barriers to Entry

The fundamental cause of monopoly power which prevents other firms from entering the market to compete, often categorized as monopoly resources, government regulation, or the production process.

Natural Monopoly

A single firm that can supply a good or service to an entire market at a smaller cost than two or more firms could, characterized by economies of scale over the relevant range of output.

Price Taker

A competitive firm that must accept the market price and faces a horizontal demand curve.

Average Revenue ($AR$)

Total revenue divided by the quantity ($TR / Q$); for a monopoly, this value always equals the price ($P$).

Marginal Revenue ($MR$)

The change in total revenue when output increases by $1$ unit ($\triangle TR / \triangle Q$). For a monopolist, $MR < P$ because the price must be lowered for all customers to increase quantity sold.

Output Effect

The increase in total revenue that occurs when the quantity sold ($Q$) is higher.

Price Effect

The decrease in total revenue that occurs when the price ($P$) is lower.

Profit Maximization Condition

The quantity level where marginal revenue equals marginal cost ($MR = MC$).

Monopoly Profit Formula

$$\text{Profit} = (P - ATC) \times Q$$

Total Surplus

The sum of consumer surplus and producer surplus, representing the economic well-being of buyers and sellers in a market.

Consumer Surplus

The amount buyers are willing to pay for a good minus the amount they actually pay for it.

Producer Surplus

The amount producers receive for a good minus their costs of producing it.

Deadweight Loss

The social loss occurring when a monopoly produces less than the socially efficient quantity, represented by the triangle between the demand curve and the $MC$ curve.

Price Discrimination

The business practice of selling the same good at different prices to different customers based on their willingness to pay.

Perfect Price Discrimination

A scenario where a monopoly charges each customer exactly their willingness to pay, allowing the firm to capture the entire surplus and eliminating deadweight loss.

Sherman Antitrust Act (1890)

A federal law aimed at increasing competition by preventing mergers and breaking up large companies.

Clayton Antitrust Act (1914)

A federal law used to curb monopoly power and prevent companies from coordinating activities to make markets less competitive.

Marginal-Cost Pricing

A regulatory strategy where the government sets the monopolist's price at $P = MC$; however, for natural monopolies, this may be less than average total cost ($ATC$).

Public Ownership

A public policy approach to monopoly where the government owns and operates the firm, such as the postal service, rather than leaving it to private owners.