3.8 Market Structure

2026 📋 Syllabus Objectives

By the end of this topic, you should be able to:

  • 3.8.1 Competitive Markets — Explain the effect of having a high number of firms on price, quality, choice, and profit. (Note: You do NOT need to know the detailed theory of perfect or imperfect competition, and diagrams are NOT required.)
  • 3.8.2 Monopoly Markets — Describe the characteristics of a monopoly, and explain its advantages and disadvantages. (Note: Diagrams are NOT required.)

📖 Main Content

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What is a Market Structure?

A market structure describes the key features of a particular market. Think of it as the "shape" or "setup" of a market. These features include:

  • How many firms (sellers) are in the market
  • Whether it is easy or hard for new businesses to enter the market
  • Whether firms compete on price, quality, or both
  • How much power any single firm has over the price it charges

There are two main market structures you need to know for your exam:

  1. Competitive markets — many firms competing with each other
  2. Monopoly markets — one firm dominates the entire market

3.8.1 Competitive Markets

What is a Competitive Market?

A competitive market is a market where there are a large number of firms all selling similar or identical products. Because there are so many sellers, no single firm has the power to control the price — the price is set by the overall forces of supply and demand.

A real-world example that comes close to this is a street food market or an agricultural market selling fruit and vegetables, where many sellers offer almost identical products.

Key Features of a Competitive Market

  • Many buyers and sellers — There are lots of firms selling and lots of customers buying.
  • No barriers to entry — It is easy and cheap for a new business to start up and join the market. Similarly, a firm can leave the market without too much difficulty. Barriers to entry are obstacles that make it hard to set up a new business — in a competitive market, these barely exist.
  • Similar or identical products — The products sold by different firms are very much alike. This is called selling homogeneous products (meaning "the same"). Because the products are so similar, buyers can easily switch from one seller to another.
  • Price takers — Because no single firm is powerful enough to control the price, every firm must accept the price the market sets. They cannot charge more than the going rate or customers will simply go elsewhere. Firms that have no control over price are called price takers.
  • Good information — Both buyers and sellers know what prices are being charged in the market.

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