Compare competitive and monopoly markets
Use number of firms and market power to assess effects on price, quality, choice and profit.
Section 3.7 · Types of markets
Cambridge IGCSE Economics 0455 / IGCSE (9–1) Economics 0987, 2027–2029 Version 1. Apply each model to the stated evidence and qualify conclusions where effects depend on context. Practice is original and self-checked; it is not a Cambridge paper, mark scheme or official grade.
Before you begin
- No prior economics study is assumed. Read the scenario for the decision-maker, the market or economy involved, the time period and the evidence supplied.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What is one possible benefit of competition?
What you will learn
- Describe competitive markets
- Explain monopoly features
- Compare likely effects without assuming one outcome
Many firms can create alternatives
Competitive markets have a high number of firms and many buyers. Rivalry can encourage lower prices, better quality, choice or efficiency; firms may have less power to set prices and profits can be limited.
The syllabus focuses on characteristics and effects, not formal perfect-competition theory or diagrams. Real markets differ in entry barriers, product differences and customer information.
Monopoly concentrates market power
A monopoly market has only one firm in the simplified syllabus definition. It may have more control over price and output, and restricted supply can cause higher prices or less choice.
A single supplier may also benefit from scale or fund investment. Assess price, quality, choice and profit in context; do not assume every monopoly behaves identically.
Pause and explain
Why might a monopoly be able to charge a higher price?
Worked example
A rural area has one water provider and no practical alternative. Explain one possible monopoly concern and one potential advantage.
Show the worked solution
- Customers have limited ability to switch.
- The provider may have pricing power or weaker competitive pressure.
- Large-scale infrastructure may reduce unit costs.
Answer Limited alternatives can weaken customer choice and competitive pressure. A single network may also avoid duplicating costly infrastructure; regulation may be needed to protect users.
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Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A town has 20 independent repair shops. Explain one possible effect of this number on customer choice and one limitation.
Give me a hint
Connect multiple firms with alternatives, then consider quality or access.
Compare my reasoning
- Customers can compare more providers.
- Rivalry may encourage price or service improvements.
- Choice is limited if shops offer different services or customers lack information.
Many shops may offer greater choice and create competitive pressure. The practical benefit depends on service differences, location and customers' ability to compare quality.
Look for these in your work
- Choice effect stated
- Competitive mechanism explained
- Limitation included
A sole internet provider invests heavily in rural infrastructure. Explain one possible monopoly disadvantage and one countervailing benefit.
Give me a hint
Balance market power against scale and investment.
Compare my reasoning
- Users may have limited alternatives.
- The provider may face weaker pressure on prices or quality.
- One network may avoid duplicating costly infrastructure.
The provider may have pricing power and limited customer choice, but a single network can make rural infrastructure investment more viable than duplicating fixed costs. Regulation and service evidence matter.
Look for these in your work
- Disadvantage explained
- Possible benefit explained
- Context considered
A regulator is reviewing a monopoly's price and service complaints. Explain two outcomes it should measure before changing the rules.
Give me a hint
Use the market dimensions: price, quality, choice and access.
Compare my reasoning
- Compare prices with costs and comparable areas.
- Check service reliability, quality and investment.
- Consider customer access and available alternatives.
It should examine prices, service quality and reliability, customer access, investment and any realistic alternatives. Complaints are evidence to investigate, not by themselves proof of the cause.
Look for these in your work
- Price evidence included
- Quality or investment included
- Access/alternatives included
Common mistakes
- Assuming many firms guarantee perfect information
- Treating monopoly as always inefficient
- Using a diagram theory not required by this syllabus
What can you explain now?
What is one concern when a market has only one seller?
Compare with the explanation
Restricted choice or weak competitive pressure
Customers may have few alternatives.
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Make it stick
What is one concern when a market has only one seller?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.