A-Level Economics: Public Goods and Information Failure

Public goods and information failure are the two market failures that work through mechanisms other than externalities, and A-level questions test whether you can keep the three failure types analytically distinct. This quiz isolates and drills both.

The public goods questions build from the defining pair — non-rivalry and non-excludability — through their consequence: the free rider problem, and why non-excludability specifically destroys the private incentive to pay, producing a missing market that only collective provision can fill. Street lighting serves as the worked example, tested for exactly why it qualifies on both criteria. Quasi-public goods get their own question on partial rivalry and excludability, and a contrast question pins down private goods as the excludable, rival baseline.

The information failure questions cover the asymmetric-information toolkit that distinguishes A-level from GCSE treatment: adverse selection, defined through the insurance case where higher-risk individuals disproportionately buy cover, and the used-car "lemons" market as the classic quality-uncertainty example; moral hazard as the behavioural change after the contract; and the standard mitigations — mandatory insurance pooling and risk-based screening — tested as a pair. The capstone question forces the general principle: asymmetric information causes market failure because prices stop reflecting true costs and benefits, so the allocation the price mechanism produces is no longer efficient.

One question links back to the externality framework (MSB exceeding MPB), keeping the market-failure taxonomy connected. Each explanation names the concept and its mechanism, building the precise definitional control that "explain why this is a market failure" questions reward.

• Define non-rivalry and non-excludability and apply them to real cases
• Explain the free rider problem and why it produces missing markets
• Distinguish pure public, quasi-public and private goods
• Analyse adverse selection and moral hazard with insurance and used-car examples
• Explain how asymmetric information breaks the price mechanism's efficiency

Aligned to the "Market failure and government intervention — information asymmetries" area of the DfE's GCE A level economics subject content, alongside the public-goods analysis of missing markets.