OxfordAQA International GCSE Economics: Competitive and non-competitive markets (9214)

This guide covers sections 3.1.5.1 to 3.1.5.3 of the OxfordAQA International GCSE Economics (9214) specification, for exams from May/June 2025 onwards: the range of market structures, competitive markets, and non-competitive markets including monopoly and oligopoly. The specification does not split the content into tiers. The labour market (3.1.5.4) is taught separately and is not covered here.

All countries, firms and figures are invented and illustrative. Money is in zeds (Z), the currency of an imaginary Country Z. Use this guide with the revision notes and the practice questions. Related pages: the How markets work guide, the course hub, the checklist and the free diagnostics.

What you must be able to do

Section	You must be able to
3.1.5.1	Explain that there is a range of market structures, and use the number of producers, the degree of product differentiation and ease of entry to tell them apart
3.1.5.2	Explain what a competitive market is and how producers operate in it; its impact on price, choice, consumers, producers and workers; why profits are likely to be lower than where a small number of producers dominate
3.1.5.3	Explain what a non-competitive market is and how producers operate in it; its impact on price and choice; the meaning of monopoly and oligopoly; the causes and consequences of monopolistic and oligopolistic power

3.1.5.1 A range of market structures

A market structure describes how a market is organised, which shapes how firms behave. Markets do not fall into two boxes. They sit along a range, from many small sellers at one end to a single seller at the other.

Three factors place a market on that range.

Factor	Points to a competitive market	Points to a non-competitive market
Number of producers	Many	One or a few
Product differentiation	Little: products are close substitutes	Large: branded or unique products
Ease of entry	Easy and cheap	Difficult: high costs or other barriers

Product differentiation means making a product different from rivals’ versions, so that buyers see it as distinct. Ease of entry is how easily a new firm can start selling in the market.

Market in Country Z	Producers	Differentiation	Entry	Where it sits
Tomatoes at the town market	About 60 stalls	Almost none	Easy: a table and stock	Competitive end
Bakeries in one district	About 25	High: own recipes and names	Fairly easy	Competitive, but with differentiation
Cement	4	Low	Very hard: plant costs a fortune	Concentrated
The only pipe network in a valley	1	None: no alternative	Blocked	Single-producer end

The bakeries show why you should use all three factors. Their products are differentiated, but there are many sellers and entry is easy, so the market is still competitive.

Worked example 1: market shares

A firm’s market share is its sales as a percentage of total sales in the market. Country Z’s cement market sells 2,000,000 tonnes a year. Four firms share it.

Firm	A	B	C	D	Total
Share (%)	44	31	15	10	100

• Firm A sells 0.44 × 2,000,000 = 880,000 tonnes.
• The two largest firms hold 44 + 31 = 75%.
• The three largest hold 44 + 31 + 15 = 90%.

Compare 60 tomato stalls of equal size: 100 ÷ 60 = 1.7% each. Cement is dominated by a few producers. Tomatoes are not.

3.1.5.2 Competitive markets

What a competitive market is

A competitive market is one in which many producers compete for the same customers. Its main characteristics are:

• many producers, so no single firm can control the price
• products that are alike or only slightly different
• easy entry and exit
• buyers who can compare prices and switch.

How producers operate

A firm that charges more than its rivals loses customers. So producers in a competitive market tend to:

• charge prices close to rivals’ prices
• keep costs low, because a squeezed margin leaves no room for waste
• compete on non-price factors such as quality, speed, service, location and advertising
• watch what customers want and change quickly.

Impact on price, choice, consumers, producers and workers

Price and choice. Prices stay low because overcharging loses sales. Choice is wide because many firms offer many versions.

Consumers gain from lower prices, wide choice, and firms that work to keep them.

Producers face pressure. Margins are thin, costs must be controlled, and weaker firms may leave the market. Efficient firms survive.

Workers are affected in two ways. Many employers competing for staff can mean more job openings and better chances of a pay rise. But firms squeezed on price may hold wages down, cut hours or close, so jobs can be less secure.

Why profits are likely to be lower

The chain of reasoning is the heart of this point:

high profit in the market → new firms enter easily → supply rises → price falls → profit per firm falls

Entry stops when little profit is left. Where a few producers dominate, entry is hard, so high profits can last.

Worked example 2: profit eroded by entry

A tomato seller in Country Z has costs of Z4 per kg and sells 150 kg a day. As more stalls open, the price falls.

Price (Z per kg)	Revenue	Total cost	Profit	Profit margin
5.50	825	600	225	27.3%
4.80	720	600	120	16.7%
4.20	630	600	30	4.8%
4.00	600	600	0	0%

Working for the first row: revenue = 5.50 × 150 = 825; total cost = 4 × 150 = 600; profit = 825 − 600 = 225; margin = 225 ÷ 825 × 100 = 27.3%. Between the first and third rows the price falls by (5.50 − 4.20) ÷ 5.50 × 100 = 23.6%. Consumers gain, and the seller’s profit falls from 225 to 30.

Worked example 3: the same cost in two markets

Take two markets where every firm has a cost of Z10 per unit and sells 1,000 units. In the competitive market, rivalry holds the price at Z11. In the market dominated by three firms, the price is Z15.

	Competitive	Dominated
Revenue	11 × 1,000 = 11,000	15 × 1,000 = 15,000
Total cost	10 × 1,000 = 10,000	10 × 1,000 = 10,000
Profit	1,000	5,000
Margin	1,000 ÷ 11,000 = 9.1%	5,000 ÷ 15,000 = 33.3%

Evaluation: equal costs are an assumption. A dominant firm may have lower costs because of its size. The gap shows the direction of the effect, not an exact rule.

3.1.5.3 Non-competitive markets

What a non-competitive market is

A non-competitive market is one in which competition is limited because one firm or a few large firms dominate. Its main characteristics are one or a few producers, barriers to entry, products that may be branded or unique, and firms that have some power over price.

How producers operate

A producer with market power can often set its price rather than accept the going price, and it can keep profits high without fearing that customers will leave.

Impact on price and choice

Prices tend to be higher and choice narrower than in a competitive market, because buyers have few or no alternatives.

Monopoly

A monopoly is a market with a single producer. People also use the word, loosely, for a firm with a very large share of the market. Such a firm is better described as having monopoly power. Either way, the firm faces little or no direct rivalry and can influence the price.

Worked example 4: a monopoly raises its fare

The only ferry operator serving an island (invented) raises the adult fare from Z40 to Z52. Monthly passengers fall from 10,000 to 9,200.

• Fare rise = (52 − 40) ÷ 40 × 100 = 30%.
• Passenger fall = 800 ÷ 10,000 × 100 = 8%.
• Revenue before = 40 × 10,000 = Z400,000. Revenue after = 52 × 9,200 = Z478,400.
• Revenue change = 78,400 ÷ 400,000 × 100 = +19.6%.

Islanders have no other way across, so most keep travelling. Now a rival opens a boat service and the fare falls to Z42: the cut from 52 is 10 ÷ 52 × 100 = 19.2%. The fare is still 5% above the original Z40, so competition reduced the rise but did not remove it.

Oligopoly

An oligopoly is a market dominated by a small number of large producers. Firms are interdependent: each must predict how rivals will react before it acts. This is why price cuts are risky.

Worked example 5: why price wars hurt

Three firms each sell 1,000 units a month at Z10 with a cost of Z7 per unit.

• Profit per firm = (10 − 7) × 1,000 = Z3,000.
• Firm A cuts its price to Z9 and the others hold. A wins customers: A sells 1,600 and B and C sell 700 each. A’s profit = 2 × 1,600 = Z3,200. B and C each earn 3 × 700 = Z2,100.
• B and C respond by cutting to Z9. Total demand rises to 3,300, so each firm sells 1,100. Profit per firm = 2 × 1,100 = Z2,200.

Everyone now earns less than the original Z3,000, a fall of 800 ÷ 3,000 × 100 = 26.7%. Rational oligopolists therefore often avoid price competition and use branding, advertising and loyalty offers instead. They may also collude, which is generally against the law.

Causes of monopolistic and oligopolistic power

Cause	How it creates market power
High start-up costs	New firms cannot afford to enter
Economies of scale	Large firms have lower unit costs, so newcomers cannot match their prices
Legal protection	Patents and licences give sole rights for a time
Brand loyalty	Customers will not switch, so rivals struggle to win them
Control of supplies or outlets	Rivals cannot get inputs or reach buyers
Mergers and takeovers	The number of producers falls
Successful growth	A firm that keeps winning customers can come to dominate

Worked example 6: scale creating dominance

A cement plant has fixed costs of Z600,000 a month and variable costs of Z20 per tonne. The market price is Z40.

Output (tonnes)	Total cost	Average cost	Profit at Z40
20,000	600,000 + 400,000 = 1,000,000	1,000,000 ÷ 20,000 = Z50	(40 − 50) × 20,000 = −Z200,000
80,000	600,000 + 1,600,000 = 2,200,000	2,200,000 ÷ 80,000 = Z27.50	(40 − 27.50) × 80,000 = Z1,000,000

At that price only the large plant survives. Scale lets it dominate, and it could pass some saving to buyers, but without rivals it need not.

Consequences of monopolistic and oligopolistic power

Group	Possible harm	Possible benefit
Consumers	Higher prices, less choice, weaker service	Lower prices if scale savings are passed on; better products funded by profit
The dominant firm	May become complacent and inefficient	High profit, which can fund research and investment
Smaller rivals	Squeezed out or kept out	Some survive in niches

Strong answers build a chain and then judge it. Example: high start-up costs → few entrants → little pressure on existing firms → they can raise prices without losing many customers → consumers pay more and choose from less. Then ask how far it holds. It depends on how high the barriers are, whether the firm fears new entrants, whether cost savings are passed on, and whether rules limit its behaviour.

Common errors

• Writing that a monopoly always charges high prices. It can, and you should say why.
• Saying that oligopolists never compete. They often compete hard, but on branding and quality more than on price.
• Treating any large firm as a monopoly. A large firm in a market with many rivals is not one.
• Giving only the good or only the bad effects when asked to evaluate.

Official syllabus

Source: OxfordAQA, International GCSE Economics (9214) specification, first teaching September 2023, first examined May/June 2025, sections 3.1.5.1 to 3.1.5.3.