Study Notes
A monopoly is a market structure where a single firm is the sole seller of a product or service, allowing it to exercise significant market power as a price maker. Monopolies can earn abnormal profits, normal profits, or even incur losses depending on their cost and revenue structures.
- Monopoly — a single seller in a market with no close substitutes and high barriers to entry. Example: Utility companies like water or electricity providers.
- Natural Monopoly — occurs when a single firm can supply the entire market more efficiently than multiple firms due to high fixed costs and economies of scale. Example: Railways or pipelines.
- Abnormal Profit — profit exceeding normal profit, where price per unit is higher than average cost. Example: A monopoly charging a price above its production cost.
- Allocative Inefficiency — occurs when resources are not allocated optimally, leading to a welfare loss. Example: A monopoly setting prices above marginal cost.
- Barriers to Entry — obstacles that prevent new competitors from easily entering an industry. Example: Patents, high start-up costs, or control of essential resources.
Exam Tips
Key Definitions to Remember
- Monopoly
- Natural Monopoly
- Abnormal Profit
- Allocative Inefficiency
- Barriers to Entry
Common Confusions
- Confusing normal profit with abnormal profit
- Misunderstanding the concept of allocative inefficiency
Typical Exam Questions
- What is a monopoly? A market structure with a single seller and high barriers to entry.
- How does a natural monopoly differ from a regular monopoly? A natural monopoly is more efficient for one firm to supply the entire market due to high fixed costs.
- Why do monopolies lead to allocative inefficiency? Because they set prices above marginal cost, leading to underallocation of resources.
What Examiners Usually Test
- Understanding of monopoly characteristics and market power
- Ability to explain and illustrate abnormal profits and losses
- Knowledge of the implications of allocative inefficiency and market failure