Why does the market under-provide certain goods, and what does information have to do with it?
Public goods and the free-rider problem, merit and demerit goods, information gaps and asymmetric information, and the under- or over-provision of these goods.
An answer to AQA A-Level Economics 4.1.7, covering public goods and the free-rider problem, merit and demerit goods, information gaps and asymmetric information, and why the market under- or over-provides these goods.
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What this dot point is asking
AQA wants you to define public goods and the free-rider problem, distinguish merit and demerit goods, and explain how information gaps and asymmetric information cause market failure and lead to under- or over-provision. These are distinct causes of market failure, so keep them separate from externalities.
Public goods
Some goods are quasi-public: they have public-good features but can be partly excludable or rival, for example a road (excludable via tolls) or a beach (rival when crowded). The free-rider problem is weaker for these, so the market may provide some but not the optimal amount.
Merit and demerit goods
The judgement that a good is "merit" or "demerit" involves a value judgement (a normative element), because it implies the state knows better than the individual what is good for them. This is why merit-good policy is contested.
Information failure
Markets work well only when buyers and sellers are well informed. Information gaps (imperfect information) lead consumers to make decisions that do not maximise their welfare, such as undervaluing the long-term return to education. Asymmetric information occurs when one party to a transaction has more or better information than the other. Classic cases include the used-car market (sellers know hidden faults, so buyers fear "lemons" and the market can collapse, Akerlof) and insurance (adverse selection and moral hazard). Asymmetric information can lead to under-consumption, over-consumption or complete market breakdown.
Exam-style practice questions
Practice questions written in the style of AQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AQA 20186 marksExplain why the free market fails to provide pure public goods such as national defence.Show worked answer →
A 6 mark question rewards the two characteristics linked to the free-rider problem.
- Characteristics
- A pure public good is non-rival (one person's use does not reduce availability to others) and non-excludable (non-payers cannot be prevented from consuming it).
- Free-rider problem
- Because non-payers cannot be excluded, rational consumers wait for others to pay and consume for free. Demand is therefore not revealed and firms cannot charge a price that covers costs.
- Outcome
- With no profit incentive the market under-provides or fails entirely (a missing market), so the government provides defence and funds it through taxation. Markers reward linking non-excludability to free-riding and the missing market.
AQA 20219 marksAssess the view that information failure is the main reason for the underconsumption of merit goods.Show worked answer →
A 9 mark assessment question needs evaluation and a judgement.
- Information failure argument
- Consumers undervalue the private long-term benefits of merit goods such as education and healthcare, often because the benefits are distant or poorly understood, so they consume less than is optimal.
- Other reasons
- Underconsumption also reflects positive externalities (third-party benefits ignored by private decisions) and affordability or inequality (some cannot pay), not just poor information.
- Judgement
- Information failure is a major cause but rarely the only one; positive externalities and income constraints also matter, which is why government uses provision, subsidy and information campaigns together. Markers reward weighing the causes and reaching a supported view.
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Sources & how we know this
- AQA A-level Economics (7136) specification — AQA (2015)