AQA A Level Economics 3.1.8 The Market Mechanism, Market Failure and Government Intervention Exam Questions

About AQA A Level Economics 3.1.8 The Market Mechanism, Market Failure and Government Intervention

The market mechanism, market failure and government intervention is section 3.1.8 of AQA A Level Economics and is the final section examined on Paper 1. It explains how the price mechanism allocates resources, then the forms of market failure: public goods and the free rider problem, positive and negative externalities in consumption and production, merit and demerit goods, market imperfections such as imperfect information and monopoly, and the immobility of factors. It then covers competition policy, public ownership, privatisation, regulation and deregulation, indirect taxes, subsidies, price controls, state provision, and finally government failure. Examiners set many 25 mark essays here and reward balanced evaluation.

What you need to know

• The market mechanism Price acts as a rationing, incentive and signalling device. Markets allocate resources efficiently when there are no externalities and information is perfect, but they can fail to produce socially optimal outcomes.
• Public goods Pure public goods are non-rival and non-excludable, such as street lighting. The free rider problem means the market under-provides or does not provide them. Quasi-public goods have some of these features.
• Externalities Negative externalities (pollution) mean marginal social cost exceeds marginal private cost, causing overproduction. Positive externalities (education) mean marginal social benefit exceeds marginal private benefit, causing underconsumption. Show the welfare loss triangle on diagrams.
• Merit and demerit goods Merit goods (healthcare, education) are underconsumed partly because of imperfect information and positive externalities. Demerit goods (cigarettes) are overconsumed. These involve value judgements.
• Competition policy and ownership Competition authorities such as the Competition and Markets Authority investigate mergers, monopoly abuse and collusion. Know public ownership, privatisation, regulation of natural monopolies (price caps such as RPI minus X), deregulation and contracting out.
• Government intervention Tools include indirect taxes, subsidies, maximum and minimum prices, state provision, regulation, tradable pollution permits and extending property rights. Evaluate each in terms of information, cost, enforcement and unintended consequences.
• Government failure Government failure occurs when intervention leads to a net welfare loss. Causes include inadequate information, conflicting objectives, administrative costs, unintended consequences and regulatory capture.

Common mistakes in 3.1.8 The Market Mechanism, Market Failure and Government Intervention

• Saying public goods are goods provided by the government. A public good is defined by being non-rival and non-excludable, not by who provides it.
• Drawing a negative production externality by shifting demand. Show it as marginal social cost lying above the supply (marginal private cost) curve.
• Calling all market failure complete market failure. Complete failure is a missing market, such as for public goods; externalities usually cause partial failure.
• Assuming a tax set equal to the external cost is easy to achieve. Governments rarely know the exact size of the externality, which is a key evaluation point.
• Forgetting government failure in evaluation. Strong answers ask whether intervention might make outcomes worse than the market failure it targets.

Try three 3.1.8 The Market Mechanism, Market Failure and Government Intervention exam-style questions