Correcting Market Failure
How taxation, subsidies, state provision, legislation, regulation and information may address externalities.
How to study for GCSE Economics
Learn each definition and diagram as a causal model, practise calculations with units, apply evidence to the stated context and qualify conclusions with realistic trade-offs.
Core concepts
Concept 1
Taxes can raise private cost and reduce activity with negative externalities; subsidies can lower cost or price and encourage activity with positive externalities.
Exam cue: Match the policy mechanism to the source of the market failure.
Concept 2
State provision, legislation, regulation and information can directly change access, behaviour or knowledge.
Exam cue: Trace the policy through incentives, supply or demand to the intended social outcome.
Concept 3
Intervention has opportunity costs and may be limited by imperfect information, enforcement, unintended effects or distributional consequences.
Exam cue: Evaluate scale, timing, enforcement, fiscal cost and effects on different groups.
Risk pitfalls and guardrails
Assuming any tax removes all harmful activity.
Guardrail: Do not stop at a definition or generic advantage: show the mechanism, keep units and diagram labels accurate, and separate board-specific paper claims from the England common core.
Treating a subsidy as costless because the recipient pays less.
Guardrail: Do not stop at a definition or generic advantage: show the mechanism, keep units and diagram labels accurate, and separate board-specific paper claims from the England common core.
Evaluating only the intention of a policy rather than its mechanism and likely response.
Guardrail: Do not stop at a definition or generic advantage: show the mechanism, keep units and diagram labels accurate, and separate board-specific paper claims from the England common core.
Memory anchors
Corrective tax
Raises private cost to discourage an activity with external cost.
Subsidy
Lowers private cost or price to encourage an activity with external benefit.
State provision
Government supplies or finances a good or service.
Regulation
A legal rule constrains or requires behaviour.
Information provision
Better information helps agents make more informed choices.
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
How can a per-unit tax reduce a negative production externality?
What is the ideal corrective-tax rate in a simple model?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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