Why does the free market fail to provide public goods at all, and what makes a good public?
1.3 Public goods: the characteristics of non-rivalry and non-excludability, the free-rider problem, quasi-public goods, and why public goods cause complete market failure.
An OCR H460 answer to public goods, covering the defining characteristics of non-rivalry and non-excludability, the free-rider problem, quasi-public goods, and why pure public goods cause complete market failure and are funded by the state.
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What this dot point is asking
OCR wants you to define a public good through its two characteristics, explain the free-rider problem, distinguish pure public goods from quasi-public goods, and explain why the free market provides public goods in insufficient quantity or not at all (complete market failure).
The two characteristics
These features stand in contrast to a private good, which is rival (eating an apple leaves none for others) and excludable (a shop can stop non-payers taking it). Most goods are private; public goods are the exception that markets cannot handle.
The free-rider problem
This is why pure public goods are funded collectively through taxation: the state can compel everyone to contribute, overcoming the free-rider incentive that defeats voluntary private provision.
Quasi-public goods
Quasi-public goods sit on a spectrum between pure public and pure private goods. Technology often shifts a good along this spectrum: electronic road pricing makes a previously non-excludable road excludable, allowing the market (or the state) to charge for it and manage congestion.
Examples in context
- National defence. The textbook pure public good: it protects everyone in the country regardless of whether they contribute, so only collective, tax-funded provision works.
- Flood defences. Non-rival and non-excludable along a stretch of coast, so the Environment Agency funds them from general taxation because the market would supply none.
- Lighthouses and street lighting. Classic public goods whose benefits cannot be confined to payers, traditionally publicly provided.
- Toll roads. A quasi-public good made excludable by technology, showing how the boundary can move.
Try this
Q1. Define the two characteristics of a pure public good. [3 marks]
- Cue. Non-rival (use does not reduce availability) and non-excludable (non-payers cannot be stopped).
Q2. Explain why the free-rider problem leads to complete market failure for a pure public good. [4 marks]
- Cue. Non-payers cannot be excluded, so consumers free-ride, firms earn no revenue, and none is supplied.
Exam-style practice questions
Practice questions written in the style of OCR exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
OCR H460/01 20194 marksExplain why the free market fails to provide a pure public good such as national defence.Show worked answer →
A short structured question. Define a pure public good as non-rival (one person's use does not reduce the amount available to others) and non-excludable (non-payers cannot be prevented from benefiting).
Explain the consequence: non-excludability creates the free-rider problem, so consumers wait for others to pay and then benefit for free. With no way to charge, no profit-seeking firm can earn revenue, so the good is not supplied at all (complete market failure). National defence protects everyone in the country whether they pay or not, so the market provides none and the state funds it from taxation.
Markers reward the two characteristics, the free-rider link, and the conclusion of zero private provision.
OCR H460/01 202110 marksDiscuss whether all goods provided by the government are pure public goods.Show worked answer →
A levels-of-response question. Knowledge and application: define a pure public good (non-rival and non-excludable) and give a clear example (national defence, flood defences). Contrast with goods the government provides that are not pure public goods, such as healthcare and education, which are rival and excludable merit goods provided for equity and positive-externality reasons.
Analysis: explain quasi-public goods (roads, beaches) that are only partially non-rival or non-excludable, becoming rival when congested or excludable through tolls.
Evaluation: conclude that government provision is driven by several market failures (public goods, merit goods, externalities, equity), not only by the pure public-good case, so the statement is false. A supported judgement with examples reaches the top level.
Related dot points
- 1.3 Externalities: positive and negative externalities of production and consumption, the divergence of private and social costs and benefits, the welfare loss, and the social optimum.
An OCR H460 answer to externalities, covering positive and negative externalities of production and consumption, the divergence of private and social costs and benefits, the welfare loss triangle, and how the social optimum differs from the free-market outcome.
- 1.3 Information failure: imperfect and asymmetric information, moral hazard and adverse selection, and merit and demerit goods leading to under-consumption or over-consumption.
An OCR H460 answer to information failure, covering imperfect and asymmetric information, adverse selection and moral hazard, and how merit goods are under-consumed and demerit goods over-consumed because individuals misjudge their true costs and benefits.
- 1.3 Government failure: the causes of government failure including distorted price signals, unintended consequences, information gaps and administrative costs, and the case for and against intervention.
An OCR H460 answer to government failure, covering why intervention to correct market failure can leave society worse off, through distorted price signals, unintended consequences such as black markets, government information gaps and excessive administrative costs.
- 1.3 Methods of intervention: indirect taxes and subsidies, the incidence of tax and elasticity, maximum and minimum prices, tradable pollution permits, regulation, state provision and information provision.
An OCR H460 answer to government intervention methods, covering indirect taxes and subsidies, the incidence of an indirect tax and how elasticity splits the burden, maximum and minimum prices, tradable pollution permits, regulation, state provision and information provision.
Sources & how we know this
- OCR A Level Economics (H460) Specification — OCR (2023)