amazon.co.ukMarket Failure and Government Intervention
A-Level Economics revision: Market Failure and Government Intervention. Learning objectives, key points, worked examples and practice questions across AQA, Edexcel, OCR, WJEC and CCEA.
📌 Key Points
Key Fact: Externalities: divergence private/social costs/benefits; Negative: MSC>MPC (pollution); Positive: MSB>MPB (education)
Key Fact: Pigouvian tax = MEC at optimum; Subsidy = MEB; Tradable permits: cap-and-trade; Regulation: standards/bans
Key Fact: Public goods: non-excludable (can't stop use), non-rival (one's use doesn't reduce other's) -> free rider -> underprovision
Key Fact: Info asymmetry: adverse selection (pre-contract, hidden info), moral hazard (post-contract, hidden action); Solutions: signalling, screening, regulation
Key Fact: Competition: CMA investigates mergers (SLC test), cartels (price-fixing), abuse of dominance; Regulation: price caps (RPI-X), profit caps
🎯 Learning Objectives
- Identify sources of market failure: externalities, public goods, information asymmetry, market power
- Analyse negative/positive externalities: MSC=MPC+MEC, MSB=MPB+MEB
- Evaluate policies: Pigouvian taxes, subsidies, tradable permits, regulation, nudges
- Understand public goods: non-excludable, non-rival; free-rider problem
- Analyse information asymmetry: adverse selection, moral hazard; solutions
- Evaluate competition policy: monopolies, mergers, cartels, regulation
💡 Worked Example
Exam-Style Question
Question: A factory pollutes a river. MPC = 20+Q, MEC = 5, MPB = 100-Q. Find market output, social optimum, and tax
Model Answer:
Market: MPC=MPB -> 20+Q=100-Q -> Q=40. Social: MSC=MSB -> 20+Q+5=100-Q -> 2Q=75 -> Q=37.5. Tax = MEC = 5 per unit. At Q=37.5, P=100-37.5=62.5. Tax revenue = 5x37.5=187.5
❓ Practice Questions
Model answers are being added progressively - questions marked ✗ don't have one yet. Cross-check with your teacher or the official mark scheme.
Questions:
- Why is clean air a public good?✗ answer coming soon
- Draw MSC/MPC for negative externality✗ answer coming soon
- Explain adverse selection in insurance✗ answer coming soon
- Evaluate tradable permits vs carbon tax✗ answer coming soon
- Why regulate natural monopolies?✗ answer coming soon
🎬 Video Resources
- Market Failure and Government Intervention - Overview -- YouTube Search
- Market Failure and Government Intervention - Exam Questions -- YouTube Search
📄 Past Papers & Exam Resources
🔗 Further Reading & Resources
- Physics & Maths Tutor - Market Failure and Government Intervention -- Free notes, worksheets, and past paper questions by topic
- Dr Frost Maths - Market Failure and Government Intervention -- Free resources, slides, and interactive questions
- BBC Bitesize - Market Failure and Government Intervention -- BBC Bitesize revision resources
📚 Lesson Plan (50 minutes)
- Starter (5 min): Recall prior knowledge of market failure and government intervention with quick questions.
- Teaching (15 min): Work through each of the learning objectives, explaining principles step by step.
- Key points review (5 min): Revisit the key points together, confirming understanding.
- Worked example (10 min): Model the example question: A factory pollutes a river. MPC = 20+Q, MEC = 5, MPB = 100-Q. Find market output, social optimum, and tax. Solution: Market: MPC=MPB -> 20+Q=100-Q -> Q=40. Social: MSC=MSB -> 20+Q+5=100-Q -> 2Q=75 -> Q=37.5. Tax = MEC = 5 per unit. At Q=37.5, P=100-37.5=62.5. Tax revenue = 5x37.5=187.5
- Practice (10 min): Students attempt the practice questions independently; circulate and support.
- Plenary (5 min): Review answers and address misconceptions.
🏠 Homework
- Why is clean air a public good?
- Draw MSC/MPC for negative externality
- Explain adverse selection in insurance
- Evaluate tradable permits vs carbon tax
- Why regulate natural monopolies?
🧾 Assessment
Check practice answers against the model answer; use the built-in practice questions as formative assessment.