What Are the Types of Market Structure in Economics?
Learn the main types of market structure in economics, from perfect competition to monopoly, and compare firms, products, entry barriers and information.
The main types of market structure are perfect competition, monopolistic competition, oligopoly and monopoly. A natural monopoly is a particular type of monopoly. They differ in how many firms sell in a market, whether products differ, how easily new firms can enter, and how much information buyers and sellers have.
For Cambridge International A Level Economics, these types and their features are covered in Different market structures (points 7.6.1 and 7.6.2). The earlier AS Level topic The price system and the microeconomy introduces how markets work, but the detailed comparison of market structures is A Level content.
| Market structure | Key features |
|---|---|
| Perfect competition | Many buyers and sellers trade an identical product. Firms can enter freely, and buyers and sellers have full information. No single firm can set the market price. |
| Monopolistic competition | Many firms sell differentiated products. Entry is relatively easy, but each firm has some freedom to set its price because its product is slightly different. Information may be imperfect. |
| Oligopoly | A few large firms dominate sales. Products may be similar or differentiated, entry is difficult, and firms must consider how rivals might react. Information may be imperfect. |
| Monopoly | One firm supplies the market. Strong barriers to entry protect it from new competitors, giving it considerable price-setting power. |
| Natural monopoly | One firm can supply the whole market at a lower average cost than several competing firms could, often because the required infrastructure is expensive. |
Exam mistake to avoid: a monopoly is defined by having one seller in a market, not by being a large business. Likewise, monopolistic competition does not mean a monopoly: it involves many competing firms.
