Compare policy tools in a mixed economy
Explain why governments intervene and weigh price controls, taxes, subsidies and other tools.
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
How does an indirect tax on a product usually affect firms' supply costs?
What you will learn
- Define a mixed economic system
- Compare benefits and costs of intervention
- Explain major policy tools for market failure
Public and private choices coexist
A mixed economic system uses both market decisions and government involvement. The balance differs by country and can change over time.
Public intervention may improve access, address external effects or support stability, but it uses resources and can create administrative or incentive costs.
Match the tool to the problem
A maximum price can protect buyers but may cause a shortage; a minimum price can protect sellers but may create a surplus. Indirect taxes and subsidies change incentives and should be shown as supply shifts in product-market diagrams.
Regulation, public provision, nationalisation, privatisation and resource quotas also have possible benefits and costs. The best tool depends on the failure, information, enforcement and who bears the cost. Cambridge does not require diagrams for all non-price tools.
Pause and explain
Why should a government compare a subsidy with other policy options?
Worked example
A government subsidises bus fares for rural routes. Explain the intended effect and one trade-off.
Show the worked solution
- The subsidy lowers the cost borne by the operator or user.
- It may support service where fares alone do not cover costs.
- Public funds have an opportunity cost and service quality must be monitored.
Answer A subsidy may help maintain rural access or lower fares. It uses public funds that could serve another purpose, and effectiveness depends on whether the subsidy reaches the intended service.
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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 binding minimum price is set above equilibrium for a farm product. Explain the likely market imbalance.
Give me a hint
Compare quantity supplied with quantity demanded at the higher price.
Compare my reasoning
- At a higher price, suppliers may offer more.
- Buyers may demand less.
- Supply can exceed demand, creating a surplus.
A minimum price above equilibrium can create a surplus because quantity supplied may exceed quantity demanded. The government may need a purchase or storage policy if it wants to maintain the price.
Look for these in your work
- Supplier response stated
- Buyer response stated
- Surplus and consequence explained
A demerit good creates external costs. Compare an indirect tax with regulation as responses.
Give me a hint
Compare incentives, enforcement and information requirements.
Compare my reasoning
- A tax raises the cost or price and may reduce use.
- Regulation can directly restrict or specify behaviour.
- Each requires suitable calibration or enforcement and can create costs.
A tax can use price incentives to reduce consumption or production, while regulation can set direct limits. A tax needs an appropriate rate and regulation needs monitoring; either may be costly or imperfect.
Look for these in your work
- Both mechanisms described
- Policy contrast made
- Limitations included
A public utility is privatised but remains regulated. Explain how ownership and government involvement can coexist.
Give me a hint
Separate ownership from the rules and service obligations.
Compare my reasoning
- Privatisation transfers ownership or control to private owners.
- Regulation sets operating standards or obligations.
- The market remains subject to government rules.
Private ownership can coexist with government regulation. The state may set safety, price or access rules while private owners operate the utility; outcomes depend on enforcement and incentives.
Look for these in your work
- Ownership change named
- Regulation role named
- Mixed arrangement explained
Common mistakes
- Assuming a price ceiling increases supply
- Treating nationalisation and regulation as the same tool
- Naming a policy without explaining its mechanism or trade-off
What can you explain now?
What is the defining feature of a mixed economic system?
Compare with the explanation
Market allocation and government involvement both operate
The balance between them varies.
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Make it stick
What is the defining feature of a mixed economic system?
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.