A Level H2 Economics Market Failure Quiz

Answer Key - A-Level Economics H2 Quiz (Market Failure)

Section A: Fundamental Concepts

1. Market Failure: A situation where the price mechanism fails to allocate resources efficiently, leading to a net welfare loss. Allocative Efficiency: Occurs where Price = Marginal Cost (P=MC), or where Marginal Social Benefit (MSB) = Marginal Social Cost (MSC). (4 marks)
2. Public Good: Non-excludable and non-rival (e.g., National Parks/Street lighting). Merit Good: Under-consumed in free market due to positive externalities/information failure (e.g., Education/Healthcare). (4 marks)
3. Asymmetric Information: When one party in a transaction has more or superior information than the other. In insurance, it leads to adverse selection (high-risk individuals are more likely to buy insurance). (4 marks)
4. MPC: The cost to the producer of producing one more unit. MSC: MPC plus the external cost imposed on third parties. MSC = MPC + External Cost. (4 marks)
5. Free-rider Problem: Since national defense is non-excludable, individuals cannot be prevented from using it even if they don't pay. Thus, there is no incentive for private firms to provide it as they cannot capture revenue. (4 marks)

Section B: Analysis and Application

6. Diagram: MSB curve above MPB curve. Equilibrium at MPB=MPC (Q1), but social optimum at MSB=MSC (Q*). Explanation: Consumers ignore the external benefit to society, leading to under-consumption (Q1 < Q*). (8 marks)
7. Mechanism: A sugar tax increases the MPC of producers, shifting the supply curve left. This increases the price and reduces the quantity demanded toward the socially optimal level, internalizing the external cost of health issues. (6 marks)
8. Mechanism: Sellers know more about car quality than buyers. Buyers offer an average price. Sellers of high-quality cars find this price too low and exit. Only "lemons" (low-quality cars) remain. (8 marks)
9. Diagram: Supply curve shifts right (MPC decreases). Explanation: Subsidy lowers the cost of production, reducing the price for consumers and increasing the quantity of EVs produced/consumed toward the socially optimal level. (8 marks)
10. Adverse Selection: Occurs before the contract (e.g., sick people buying more health insurance). Moral Hazard: Occurs after the contract (e.g., insured people taking more health risks because they are covered). (6 marks)
11. Non-excludability: Impossible to prevent someone from using the light

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# Answer Key - A-Level Economics H2 Quiz (Market Failure)

### Section A: Fundamental Concepts
1. **Market Failure:** A situation where the price mechanism fails to allocate resources efficiently, leading to a net welfare loss. **Allocative Efficiency:** Occurs where Price = Marginal Cost (P=MC), or where Marginal Social Benefit (MSB) = Marginal Social Cost (MSC). (4 marks)
2. **Public Good:** Non-excludable and non-rival (e.g., National Parks/Street lighting). **Merit Good:** Under-consumed in free market due to positive externalities/information failure (e.g., Education/Healthcare). (4 marks)
3. **Asymmetric Information:** When one party in a transaction has more or superior information than the other. In insurance, it leads to **adverse selection** (high-risk individuals are more likely to buy insurance). (4 marks)
4. **MPC:** The cost to the producer of producing one more unit. **MSC:** MPC plus the external cost imposed on third parties. MSC = MPC + External Cost. (4 marks)
5. **Free-rider Problem:** Since national defense is non-excludable, individuals cannot be prevented from using it even if they don't pay. Thus, there is no incentive for private firms to provide it as they cannot capture revenue. (4 marks)

### Section B: Analysis and Application
6. **Diagram:** MSB curve above MPB curve. Equilibrium at MPB=MPC (Q1), but social optimum at MSB=MSC (Q*). **Explanation:** Consumers ignore the external benefit to society, leading to under-consumption (Q1 < Q*). (8 marks)
7. **Mechanism:** A sugar tax increases the MPC of producers, shifting the supply curve left. This increases the price and reduces the quantity demanded toward the socially optimal level, internalizing the external cost of health issues. (6 marks)
8. **Mechanism:** Sellers know more about car quality than buyers. Buyers offer an average price. Sellers of high-quality cars find this price too low and exit. Only "lemons" (low-quality cars) remain. (8 marks)
9. **Diagram:** Supply curve shifts right (MPC decreases). **Explanation:** Subsidy lowers the cost of production, reducing the price for consumers and increasing the quantity of EVs produced/consumed toward the socially optimal level. (8 marks)
10. **Adverse Selection:** Occurs *before* the contract (e.g., sick people buying more health insurance). **Moral Hazard:** Occurs *after* the contract (e.g., insured people taking more health risks because they are covered). (6 marks)
11. **Non-excludability:** Impossible to prevent someone from using the light once it is provided. **Non-rivalry:** One person's use of the light does not reduce the amount available for others. (6 marks)
12. **Diagram:** MSC above MPC. Free market equilibrium at MPC=MPB. **Explanation:** The area between MSC and MPB from the market quantity to the social optimum represents the deadweight loss (welfare loss) due to over-consumption. (8 marks)
13. **Regulation:** A legal mandate/ban that forces consumption to zero or a limit regardless of price. **Pigouvian Tax:** Uses price signals to reduce consumption to the social optimum while generating government revenue. (6 marks)
14. **Mechanism:** Consumers may undervalue the long-term benefits of education (e.g., higher future earnings, better citizenship) due to lack of information, leading to a demand curve (MPB) that is lower than the MSB. (6 marks)
15. **Mechanism:** Because of non-excludability, the free-rider problem exists. Voluntary contributions would be insufficient to cover costs, necessitating compulsory taxation to ensure provision. (6 marks)

### Section C: Evaluation and Synthesis
16. **Tradable Permits:** Market-based; provides incentive for firms to innovate to sell permits; ensures a specific cap on emissions. **Regulation:** Command-and-control; simpler to implement but lacks flexibility and doesn't incentivize reductions beyond the legal limit. (10 marks)
17. **Argument:** Intervention corrects failure (e.g., taxes on pollution). **Counter-argument (Govt Failure):** Information failure (wrong tax level), administrative costs, or regulatory capture can lead to a net welfare loss greater than the original market failure. (10 marks)
18. **Assessment:** Corrects under-consumption by removing price barriers. However, effectiveness depends on quality of education and whether it addresses the "true" social optimum or just provides basic access. (10 marks)
19. **Discussion:** Effective in reducing consumption. However, regressive in nature (hits low-income earners harder as a proportion of income), potentially increasing inequality. (10 marks)
20. **Nudges:** Low cost, preserves choice (e.g., auto-enrollment), effective for behavioral biases. **Financial Incentives:** Stronger motivation for rational actors but costly for the government to fund. (10 marks)