Public Goods, Common Resources and Information Failure
How non-excludability, non-rivalry, common access, asymmetric information and behavioural limits can prevent efficient market outcomes.
How to study A-level Economics
Define the issue and affected agents, choose an appropriate model, build the causal chain with data, then evaluate assumptions, trade-offs and alternatives before judging.
Core concepts
Concept 1
Pure public goods are non-rival and non-excludable, creating a free-rider problem for private provision.
Exam cue: Classify a good by rivalry and excludability rather than ownership or merit.
Concept 2
Common resources are rival but difficult to exclude, so individual incentives can lead to overuse.
Exam cue: Identify who knows what, when, and how the information gap changes behaviour.
Concept 3
Information asymmetry, uncertainty and behavioural bias can distort exchange, risk selection and decision-making.
Exam cue: Compare information, incentive and enforcement remedies with their likely costs.
Risk pitfalls and guardrails
Calling every government-provided service a public good.
Guardrail: Do not substitute a memorised diagram or generic advantage until you have identified the determinant, mechanism, affected agents and time horizon.
Confusing a merit good with a pure public good.
Guardrail: Do not substitute a memorised diagram or generic advantage until you have identified the determinant, mechanism, affected agents and time horizon.
Naming asymmetric information without explaining its effect on price, quantity or quality.
Guardrail: Do not substitute a memorised diagram or generic advantage until you have identified the determinant, mechanism, affected agents and time horizon.
Memory anchors
Non-rivalry
Non-rivalry means one person's use does not materially reduce availability to others.
Non-excludability
Non-excludability means it is difficult or costly to prevent non-payers from benefiting.
Free Rider
A free rider benefits without contributing to provision.
Asymmetric Information
Asymmetric information exists when one party has materially better information than another.
Moral Hazard
Moral hazard occurs when protection from consequences changes behaviour after an agreement.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What makes a good non-rival?
What makes a good non-excludable?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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