Monopoly

A monopoly is a market structure defined by the following key features:

• Single Seller: A pure monopoly has only one firm in the industry. The UK Competition and Markets Authority (CMA) defines a firm as having monopoly power if it controls 25% or more of the market share.

• High Barriers to Entry: These barriers prevent new firms from entering the market and eroding supernormal profits in the long run. Examples include:

  • Economies of Scale: Existing large firms have lower average costs, making it difficult for new, smaller firms to compete on price.

  • Legal Barriers: Patents, copyrights, and government licenses.

  • Control over Essential Resources: Owning a key input or distribution network (e.g., control over railway lines).

  • Brand Loyalty/Advertising: High levels of successful marketing create strong brand loyalty.

• Unique Product/No Close Substitutes: The product sold by the monopolist has no readily available alternatives, giving the firm significant control.

• Price Maker: Since the firm is the sole (or dominant) supplier, it faces the market demand curve, which is downward sloping. It can set the price or the quantity, but not both independently.

Profit Maximising Equilibrium

A monopolist, like all firms aiming for profit maximisation, produces at the output level where Marginal Cost (MC) equals Marginal Revenue (MR):

• Profit Maximising Output: MC = MR

• Output Determination: The output quantity is determined by the intersection of the MC and MR curves.

• Price Determination: The profit-maximising price is then set by reading vertically up from to the Average Revenue (AR) curve (which is the market demand curve).

• Profit: Because of high barriers to entry, the monopolist can earn supernormal profit in both the short run and the long run.

The diagram shows a typical monopoly market structure, characterized by a single seller. The firm faces the downward-sloping Demand (D=AR) curve, which is the market demand, and a separate, steeper Marginal Revenue (MR) curve lying below it. The Average Cost (AC) and Marginal Cost (MC) curves represent the firm's costs. A monopolist maximizes profit by producing the quantity where Marginal Revenue equals Marginal Cost (MR = MC).

This occurs at quantity Qm. The monopolist then sets the price, $P_m$, by tracing this quantity up to the demand curve ($D=AR$). Since $P_m$ is higher than the average cost at $Q_m$, the firm is earning an economic profit. The point labeled with the quantity Qc and price Pc represents the competitive outcome (or the socially optimal outcome), where price equals marginal cost (P=MC), which would be the intersection of the demand curve and the MC curve, resulting in a lower price and a higher quantity compared to the monopoly outcome.

The monopoly outcome (Pm, Qm) results in a lower output and higher price than in perfect competition, leading to a loss of total surplus known as deadweight loss, indicating allocative inefficiency. The triangle represents the deadweight loss to the society

Third Degree Price Discrimination

Third-degree price discrimination involves charging different prices to different segments of consumers for the same good or service, where the price difference is not justified by a difference in the cost of supply. Markets are typically segmented based on differences in Price Elasticity of Demand (PED), e.g., age, time of purchase (peak/off-peak), or location.

Necessary Conditions

• Monopoly Power (Price-Making Power): The firm must have the ability to set prices (i.e., a downward-sloping AR curve).

• Market Segmentation: The firm must be able to segment the market into groups with different PEDs.

• Prevention of Arbitrage (Resale): The firm must be able to prevent consumers in the lower-priced market from reselling the product to consumers in the higher-priced market.

Costs and Benefits to Consumers and Producers

Costs and Benefits for Producers (Firms)

• Benefits:

  • Increased Revenue and Profit: By extracting consumer surplus, total profit is higher than with a single price.

  • Cross-Subsidisation: Higher profits can be used to subsidise services in less profitable markets.

• Costs:

  • Administrative Costs: Costs are incurred in segmenting the market and preventing arbitrage.

Costs and Benefits for Consumers

• Benefits:

  • Lower Prices for Some: Consumers in the more elastic market (often those with lower incomes or greater alternatives) benefit from a lower price.

  • Wider Availability: Price discrimination may allow a good or service to be supplied at all, which would be unprofitable under a single price (e.g., rural bus routes).

• Costs:

  • Higher Prices for Others: Consumers in the less elastic market pay a higher price.

  • Reduced Consumer Surplus: Overall consumer welfare typically decreases as surplus is converted to producer profit.

Costs and Benefits of Monopoly to Firms, Consumers, Employees and Suppliers

To Firms

• Benefits:

  • Supernormal Profits: Guaranteed in the long run, providing funds for investment.

  • Dynamic Efficiency: Profits can be used to fund Research & Development (R&D), leading to innovation and better products/processes.

  • Exploitation of Economies of Scale: Large output leads to lower long-run average costs.

• Costs:

  • X-Inefficiency: Lack of competitive pressure can lead to complacency and a failure to minimise costs.

  • Risk of Regulation: Potential for government intervention or price capping if monopoly power is abused.

To Consumers

• Benefits:

  • Improved Products: Long-run benefits from R&D funded by supernormal profits (dynamic efficiency).

  • Lower Prices (Potential): If significant economies of scale lead to lower costs that are passed on.

• Costs:

  • Allocative Inefficiency: $\mathbf{P > MC}$, leading to under-production and a deadweight welfare loss for society.

  • Higher Prices and Lower Output: Relative to a more competitive market.

  • Less Choice/Lower Quality: Reduced incentive to respond to consumer needs without competition.

To Employees

• Benefits:

  • Higher Wages and Bonuses: Possible due to the firm's supernormal profits.

  • Greater Job Security: Large, financially stable company.

• Costs:

  • Limited Bargaining Power: If the monopolist is also a monopsony employer (dominant buyer of labour) in the area.

To Suppliers

• Benefits:

  • Secure Orders: Large, consistent demand for inputs.

• Costs:

  • Monopsony Power: The monopolist may use its dominant buying power to force down the prices it pays to its suppliers, reducing their profits.

Natural Monopoly

A natural monopoly is a special type of monopoly that occurs when the most efficient number of firms in the industry is one.

Key Characteristics:

• Significant Economies of Scale: The Long-Run Average Cost (LRAC) curve is downward sloping over the entire range of market demand.

• High Fixed Costs/Capital Costs: Requires huge initial infrastructure investment (e.g., laying water pipes, building a national railway network).

• Low Marginal Costs: The cost of serving an additional customer is relatively low once the infrastructure is in place.

• Cost Inefficiency of Duplication: It would be inefficient and wasteful (a misallocation of resources) to have multiple firms supplying the service, as this would involve costly duplication of infrastructure, resulting in higher average costs for the entire market.

Examples: Utilities such as water, gas, electricity transmission networks, and railway track infrastructure.