A Level H2 Economics Practice Paper 5

A-Level Economics H2 Quiz - Microeconomics (Answer Key)

Section A: Foundations and Price Mechanism

1. Opportunity Cost: The value of the next best alternative foregone when a choice is made. In government spending, if funds are limited, investing in healthcare means the opportunity cost is the lost benefit of infrastructure (e.g., better transport, reduced congestion). (4 marks)
2. Movement vs Shift: Movement is caused by a change in the price of the good itself. A shift is caused by non-price factors (e.g., income, tastes). Example for EVs: A government subsidy for buyers would shift the demand curve to the right. (4 marks)
3. PED Calculation: $\text{PED} = \frac{\% \Delta Q_d}{\% \Delta P} = \frac{-25\%}{10\%} = -2.5$. The absolute value is 2.5, which is $> 1$, therefore demand is elastic. (4 marks)
4. Cross-Price Elasticity (XED): Measures the responsiveness of demand for Good A to a change in the price of Good B. Positive XED indicates substitutes (price of coffee rises $\rightarrow$ demand for tea rises). Negative XED indicates complements (price of printers rises $\rightarrow$ demand for ink cartridges falls). (6 marks)
5. Diagram Analysis: Demand shift (right) and Supply shift (right). Equilibrium quantity definitely increases. The effect on price is ambiguous (depends on the magnitude of the shifts). (8 marks)

Section B: Market Structures

6. Perfect Competition: 1) Large number of buyers and sellers (no single firm can influence price). 2) Homogeneous products (perfect substitutes). (4 marks)
7. Price Taker: Because the firm is small relative to the market and the product is identical to others, it cannot raise prices without losing all customers, nor lower prices as it can sell all output at the market price. (4 marks)
8. Comparison: Both earn normal profits in the long run. However, PC firms produce at the minimum of the AC curve (productive efficiency), while Monopolistic Competition firms produce with excess capacity (downward sloping demand curve, not at min AC). (8 marks)
9. Economies of Scale: Reduction in average cost as output increases. Natural monopoly occurs when the AC continues to fall over the entire range of market demand, making it most efficient for one firm to supply the whole market. (6 marks)
10. Kinked Demand: The upper part of the demand curve is elastic (competitors don't follow price increases) and the lower part is inelastic (competitors follow price cuts). This creates a "kink" at the current price, meaning MC can fluctuate within a range without changing the price. (8 marks)
11. Competition: Price competition involves cutting prices to gain market share. Non-price competition involves branding, quality, or service. Example: Singtel/StarHub using bundled "family plans" or loyalty rewards to retain customers. (6 marks)
12. Price Discrimination: Charging different prices to different consumers for the same product. Diagram should show separate demand curves for different segments (e.g., student vs adult). Condition: Market power and the ability to prevent resale (arbitrage). (8 marks)
13. Monopoly Evaluation:
    • Downside: Higher prices, lower output, allocative inefficiency (P > MC), potential for X-inefficiency.
    • Upside: Dynamic efficiency (supernormal profits fund R&D), economies of scale (lower costs than many small firms).
    • Judgment: Depends on regulation (e.g., price caps) and whether the monopoly is "natural" or "contestable." (12 marks)

Section C: Market Failure and Government Intervention

14. Externalities: Costs or benefits falling on a third party. Positive: Benefit to others (e.g., vaccination). Negative: Cost to others (e.g., pollution). (4 marks)
15. Public Goods: Non-excludable and non-rivalrous. Leads to the "free-rider problem" where individuals have no incentive to pay, so private firms will not produce it, leading to under-provision. (6 marks)
16. Merit vs Public: Public goods are non-excludable/non-rivalrous. Merit goods are excludable/rivalrous but are under-consumed due to positive externalities or information failure (e.g., education). (4 marks)
17. Diagram: MSC curve above MPC curve. Market equilibrium at MPC=MPB, but social optimum at MSC=MSB. The gap represents the external cost, leading to overproduction and a deadweight loss triangle. (8 marks)
18. Pigouvian Tax: A tax equal to the marginal external cost. It shifts the MPC curve upwards to align with the MSC curve, internalizing the externality and reducing quantity to the socially optimal level. (6 marks)
19. Asymmetric Info: When one party has more information than the other. Adverse Selection: High-risk individuals are more likely to buy insurance. Insurers raise premiums $\rightarrow$ low-risk people leave $\rightarrow$ "death spiral" where only high-risk remain. (8 marks)
20. Evaluation:
    • Regulation: Direct, certain outcome (e.g., ban on leaded petrol), but high monitoring costs and inflexible.
    • Market-based (Taxes): Provides incentive for firms to innovate/reduce pollution, generates revenue, but difficult to value the externality accurately.
    • Judgment: A combination (policy mix) is usually most effective. (12 marks)