What is imperfect competition in the context of IB DP Economics?

Imperfect competition refers to market structures that fall between perfect competition and monopoly. In the IB DP Economics curriculum, it includes monopolistic competition and oligopoly. These structures are characterized by firms having some control over pricing, differentiated products, and barriers to entry, which contrast with the assumptions of perfect competition.

How does monopolistic competition differ from perfect competition?

Monopolistic competition differs from perfect competition primarily through product differentiation and market power. In monopolistic competition, firms sell products that are similar but not identical, allowing them to have some control over pricing. Unlike perfect competition, where firms are price takers, firms in monopolistic competition can influence prices due to brand loyalty and product differentiation.

What are the key characteristics of an oligopoly?

An oligopoly is a market structure characterized by a small number of large firms that dominate the market. Key features include interdependent decision-making, significant barriers to entry, and the potential for collusion. Firms in an oligopoly may engage in non-price competition and strategic behavior to maintain market share.

Why is non-price competition significant in imperfect competition?

Non-price competition is significant in imperfect competition because it allows firms to differentiate their products and build brand loyalty without altering prices. This includes advertising, product quality improvements, and customer service enhancements. In markets like monopolistic competition and oligopoly, non-price competition is crucial for firms to gain a competitive edge and attract consumers.

How do barriers to entry affect market structures in imperfect competition?

Barriers to entry play a crucial role in determining the dynamics of imperfect competition. In monopolistic competition, barriers are relatively low, allowing new firms to enter the market easily. However, in an oligopoly, significant barriers such as high startup costs, economies of scale, and legal restrictions prevent new competitors from entering, allowing existing firms to maintain their market power and influence prices.

Market Structure on Imperfect Competition I | IB DP Economics

Summary

A monopoly is a market structure where a single firm is the sole seller of a product with no close substitutes, allowing it to be a price maker with significant market power. Monopolies can earn abnormal profits due to high barriers to entry and lack of competition, but they may also lead to allocative inefficiency and market failure. A 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.

Monopoly — a single seller of a good or service in a market. Example: A utility company providing electricity in a region.
Abnormal Profit — profit exceeding the normal profit level, where price per unit is higher than average cost. Example: A monopolist setting prices above production costs.
Allocative Inefficiency — occurs when resources are not distributed optimally, leading to a welfare loss. Example: A monopoly setting prices higher than marginal cost.
Natural Monopoly — a market where a single firm can supply the entire market more efficiently than multiple firms. Example: A water supply company with extensive infrastructure.
Barriers to Entry — obstacles that prevent new competitors from easily entering an industry. Example: High startup costs or legal restrictions.

Exam Tips

Key Definitions to Remember

Monopoly
Abnormal Profit
Allocative Inefficiency
Natural Monopoly
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 no close substitutes.
How do monopolies earn abnormal profits? By setting prices above average costs due to lack of competition.
Why are natural monopolies considered efficient? Because they can supply the entire market at a lower cost than multiple firms.

What Examiners Usually Test

Understanding of monopoly characteristics and market power
Ability to explain and illustrate abnormal profits and allocative inefficiency
Knowledge of barriers to entry and their impact on market structure

Market Structure on Imperfect Competition I