Monopoly in Economics

Main Ideas

• After studying this chapter, you will be able to:

  • Explain how monopoly arises and distinguish between single-price monopoly and price-discriminating monopoly.

  • Explain how a single-price monopoly determines its output and price.

  • Compare the performance and efficiency of single-price monopoly and competition.

  • Explain how price discrimination increases profit.

  • Explain how monopoly regulation influences output, price, economic profit, and efficiency.

Monopoly and How It Arises

• Definition of Monopoly:

  • A market characterized by a single firm that produces a good or service for which no close substitute exists.

  • The firm is protected by barriers that prevent other firms from entering the market.

• How Monopoly Arises:

  • No Close Substitute: The product offered by the monopoly cannot be easily replaced.

  • Barriers to Entry:

  • Natural Barriers to Entry: Typically forms a natural monopoly.

  • Ownership Barriers to Entry: For instance, a company like De Beers that controls a precious resource.

  • Legal Barriers to Entry: These include:

    • Public Franchise: Government granting exclusive rights to a company.

    • Government License: Licensing that allows a firm to operate as a monopoly.

    • Patent: Legal rights that prevent others from producing a patented product.

    • Copyright: Legal rights protecting creators’ works from unauthorized use.

Monopoly Price-Setting Strategies

• Pricing Strategies in Monopoly:

  • Monopolies have the power to set their own prices due to lack of competition.

  • Single-Price Monopoly:

  • Must sell each unit of its output for the same price to all customers.

  • Price Discriminating Monopoly:

  • Sells different units of a good or service at varying prices to different consumers.

A Single-Price Monopoly’s Output and Price Decision

• Relationship Between Price and Marginal Revenue:

  • Since there is only one firm, the demand curve facing the monopolist is the market demand curve.

  • Total Revenue (TR): $TR = P imes Q$

  • Marginal Revenue (MR): $MR = rac{ riangle TR}{ riangle Q}$

  • It is important to note that MR < P due to the downward-sloping demand curve.

• Marginal Revenue and Elasticity of Demand:

  • The relationship of MR to elasticity is crucial:

  • Elastic Demand: If elasticity > 1 .

  • Inelastic Demand: If elasticity < 1 .

  • Unit Elastic Demand: If elasticity $= 1$.

  • Monopolistic Demand: Typically elastic.

• Price and Output Decision of a Single-Price Monopoly:

  • To maximize economic profit:

  • $ext{Economic Profit} = (P - ATC) imes Q$

  • Monopolists maximize profit where $MR = MC$ and prices correlate to demand as $P = D$.

Comparing Single-Price Monopoly and Competition

• Perfect Competition:

  • Equilibrium occurs when Supply (S) equals Marginal Cost (MC) equals Demand (D).

  • Efficiency achieved where Marginal Social Benefit (MSB) equals Marginal Social Cost (MSC).

  • Surplus is maximized, and Long-Run Average Cost (LRAC) is minimized.

• Monopoly vs Perfect Competition:

  • Equilibrium Computations:

  • In monopolistic markets, equilibrium prices and quantities occur where $MR = MC$ and $P = D$ and differ from competitive markets.

  • Monopolies produce smaller output and charge higher prices than a perfectly competitive market.

  • Monopoly leads to inefficiency with MSB > MSC ; consumer surplus is redistributed, resulting in decreased total surplus and deadweight loss.

Rent-Seeking Behavior in Monopoly

• Concept of Rent-Seeking:

  • Surplus - Economic Rent

  • The pursuit of wealth through capturing economic rent is termed 'rent seeking.'

  • Monopolists redistribute consumer surplus to themselves (producers) in the form of profit, reflecting rent-seeking behavior.

• Methods of Rent-Seeking:

  • Buy a Monopoly: Individuals or firms seek to obtain monopoly power.

  • Create a Monopoly: Engaging in practices that establish monopolistic power.

• Rent-Seeking Equilibrium:

  • There should be no barriers to entry for rent seeking; it behaves similarly to perfect competition.

  • Competition drives up Average Total Cost (ATC) in rent-seeking environments.

  • Rent seekers can make zero economic profit, contributing to greater deadweight loss than from lost producer surplus.

Price Discriminating Monopoly

• Impact of Price Discrimination on Economic Profit:

  • Price discrimination enhances economic profit by capturing consumer surplus and converting it into producer surplus.

  • Price discrimination can occur in two key ways:

  • Discriminating Among Groups of Buyers: Different prices for different segments.

  • Discriminating Among Units of a Good: Different units sold at varying prices based on willingness to pay.

• Perfect Price Discrimination:

  • Occurs when a firm can charge each consumer the highest price they are willing to pay.

  • This practice eliminates consumer surplus entirely, transferring it to producer surplus.

  • In this scenario, the market demand curve becomes the marginal revenue (MR) curve, achieving efficiency as total deadweight loss equals zero.

Monopoly Regulation

• Efficient Regulation of a Natural Monopoly:

  • Marginal Cost Pricing Rule: Set price equal to marginal cost $P = MC$ to achieve efficient quantity. However, this could lead to economic loss, which might be covered through other means like price discrimination.

  • Average Cost Pricing Rule: Set price equal to average cost $P = AC$ resulting in break-even but includes deadweight loss.

  • Government Subsidy: This can cause deadweight loss due to taxation implications.

  • Rate of Return Regulation: Justifies pricing by demonstrating a low rate of return on capital, potentially leading to wasteful expenditure.

  • Price Cap Regulation: Establish prices within specific limits to prevent exploitation of monopoly power.