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1.5.1 Market structures

1.5.1 Market structures

Competition Runs on a Spectrum from Perfect Competition to Pure Monopoly

Definition

Market structure: the characteristics of a market, such as the number of firms, the degree of product differentiation and the ease of entry, that shape the behaviour and performance of firms within it.

  1. Market structures run from perfect competition to pure monopoly.
  2. Monopolistic competition and oligopoly sit in between.
  3. Structure shapes how firms behave and how efficient the outcome is.
Note
  • Structure is set by more than just the number of firms.
  • Product differentiation, barriers to entry and information all matter too.

Number of Firms, Product Differentiation and Ease of Entry Distinguish Structures

  1. The number and size of firms in the market.
  2. The degree of product differentiation.
  3. The ease of entry and exit, and the availability of information.

The Four Structures Compared

  1. Perfect competition
    1. Very many small firms selling identical products, with free entry and exit; each firm is a price-taker.
  2. Monopolistic competition
    1. Many firms selling slightly differentiated products with easy entry, giving each a little price-setting power.
  3. Oligopoly
    1. A few large interdependent firms behind high barriers to entry, selling branded or similar products.
  4. Monopoly
    1. One dominant firm with a unique product and very high barriers to entry; it is a price-maker.
Example
  • Farming sits near perfect competition, with many small firms selling near-identical produce.
  • Independent restaurants are monopolistically competitive, and UK supermarkets are a classic oligopoly of a few large chains.
  • Rail travel on a single route can be close to monopoly, with one operator and no substitute.

A Market's Place on the Spectrum Predicts How Firms Behave

  1. Where firms are many and products identical, price-taking follows.
  2. Where entry is hard, firms gain power to set prices.
  3. So placing a market on the spectrum predicts firm conduct.

Judge Structure on Several Criteria, Not Firm Numbers Alone

Exam technique
  • Judge structure on firms, differentiation, entry and information.
  • Place the market on the spectrum before predicting behaviour.
Common Mistake
  • Do not treat the number of firms as the only criterion.
  • Barriers to entry and product differentiation matter just as much.
Self review
  • Name the four main market structures.
  • What distinguishes one structure from another?
  • Why is the number of firms not enough on its own?
  • How does structure link to firm behaviour?

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Question 1

25 marks

Figure 1: Estimated market share of UK premium artisan bakery and cafe chains, 2023

BrandMarket Share (%)
Gail's Bakery32%
Paul15%
Ole & Steen11%
Le Pain Quotidien8%
Black Sheep Coffee & Bakes6%
Cornish Bakery4%
Independent/Local Craft Bakeries24%

Extract A: Premium baking – the rise of the sourdough economy

Artisan bakeries and premium cafes are currently one of the fastest-growing segments of the UK hospitality sector. Driven by a structural shift in consumer tastes toward high-quality, sourdough-based breads, specialty pastries, and premium organic coffee, brands like Gail's (backed by private equity firm McWin) have expanded rapidly out of London into affluent suburban districts. Gail's parent company reported record revenues of over £180 million in 2023, representing a 20% growth year-on-year.

While independent high street retailers have long struggled against rising operating costs, premium artisan chains appear resilient. Customers are proving remarkably price-insensitive, with many willing to pay £4.50 to £5.00 for a sourdough loaf. However, this aggressive expansion has triggered debate. On one hand, these chains are major job creators, providing employment for thousands of young baristas and bakers, and boosting local business rates in struggling suburban town centres. Their expansion has also stimulated domestic supply chains, particularly UK flour mills and organic dairy farms.

On the other hand, critics argue that the dominance of private-equity-backed chains risks homogenising the high street and crowding out independent, locally owned bakeries that cannot compete with the vertical integration and purchasing power of national chains. Furthermore, some chains have faced scrutiny over corporate tax structures. Several leading brands are structured under parent companies registered in low-tax jurisdictions, raising concerns that profits generated in UK communities are being repatriated abroad rather than contributing to the UK's public services through corporation tax.

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What are the two endpoints of the market-structure spectrum?

3.4 Market structures Revision Guide

  1. A Level
  2. /Economics
  3. /3.4 Market structures

Revision notes for Edexcel A A Level Economics 3.4 Market structures. Open each subtopic for explanations, worked examples, and summaries of 3.4.1 Efficiency, 3.4.2 Perfect competition, 3.4.3 Monopolistic competition, 3.4.4 Oligopoly, 3.4.5 Monopoly, 3.4.6 Monopsony, and 3.4.7 Contestability. Written against the Edexcel A A Level Economics (9EC0) specification, so the content matches what's examinable rather than general Economics background.