A Level H2 Economics Microeconomics Quiz

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

Section A: Price Mechanism and Elasticity

1. Opportunity Cost: The value of the next best alternative foregone. In this context, the opportunity cost of spending more on healthcare is the lost benefit of the education services that could have been funded with those resources. (2 marks)
2. Movement vs Shift: A movement occurs due to a change in the price of the good itself (change in quantity demanded). A shift occurs due to a change in non-price determinants (e.g., income, tastes, price of substitutes), changing the demand at every price level. (4 marks)
3. Calculation:
   • %$\Delta$Q = $(70-100)/100 = -30\%$
   • %$\Delta$P = $(12-10)/10 = 20\%$
   • PED = $-30\% / 20\% = -1.5$.
   • Interpretation: Demand is price elastic ($|PED| > 1$), meaning the percentage change in quantity demanded is greater than the percentage change in price. (4 marks)
4. Necessity vs Luxury: Necessities (e.g., insulin) have few substitutes and are essential for survival, making consumers less responsive to price changes. Luxuries (e.g., designer bags) are optional and have more substitutes, making consumers more sensitive to price changes. (4 marks)
5. Subsidy Diagram: Diagram should show a rightward/downward shift of the supply curve ($S \rightarrow S_{subsidy}$). Equilibrium price falls, and equilibrium quantity increases. (6 marks)
6. PES and Time: In the very short run, PES is inelastic as firms cannot change inputs. In the long run, PES is more elastic as firms can expand capacity, hire more labor, or new firms can enter the market. (6 marks)

Section B: Market Structures

7. Perfect Competition: Large number of buyers/sellers; homogeneous products; perfect information; no barriers to entry/exit. (Any two) (2 marks)
8. Monopolistic Competition: Short run: Product differentiation allows the firm to act as a "mini-monopoly," charging a price above MC to earn supernormal profits. Long run: Low barriers to entry attract new firms, shifting the individual firm's demand curve left until only normal profits are earned. (6 marks)
9. Price Discrimination: Charging different prices to different consumers for the same product. Condition: Market power (ability to segment market) and prevention of resale (arbitrage). (3 marks)
10. Monopoly Profit Max: Diagram showing $MC=MR$. Price is read from the demand curve above the $MC=MR$ point. Shaded area between Price and ATC represents supernormal profit. (6 marks)
11. Interdependence: Firms' decisions depend on the reactions of rivals. If one firm lowers price, others follow to maintain market share. This leads to a "kinked demand curve" where prices remain sticky/rigid to avoid price wars. (6 marks)
12. Allocative Efficiency: Perfect Competition: $P=MC$, achieving allocative efficiency. Monopoly: $P > MC$, creating a deadweight loss as the price is higher and quantity lower than the socially optimal level. (6 marks)
13. Non-Price Competition: Branding increases perceived value and consumer loyalty, making demand more inelastic. This allows firms to compete on quality/image rather than price, avoiding the "race to the bottom" of price wars. (6 marks)
14. Merger Evaluation:
    • Disadvantage: Increased market power $\rightarrow$ higher prices, lower output, reduced choice.
    • Advantage: Economies of scale $\rightarrow$ lower average costs, which could be passed to consumers. Dynamic efficiency $\rightarrow$ more funds for R&D.
    • Conclusion: Depends on the degree of contestability and whether the government regulates the merger to prevent abuse of dominance. (10 marks)

Section C: Market Failure and Government Intervention

15. Public vs Merit: Public goods are non-excludable and non-rivalrous (e.g., national defense). Merit goods are excludable and rivalrous but are under-consumed due to positive externalities or information failure (e.g., vaccinations). (4 marks)
16. Asymmetric Information: High-risk individuals know their health status better than the insurer. They are more likely to buy insurance. Insurers raise premiums to cover the risk, causing low-risk individuals to leave the market (adverse selection). (6 marks)
17. Negative Externality Diagram: Diagram showing $MPC$ and $MSC$. The gap is the external cost. Free market equilibrium is where $MPC=MPB$, but social optimum is $MSC=MSB$. Overproduction leads to a deadweight loss triangle. (8 marks)
18. Pigouvian Tax: A tax equal to the external cost shifts $MPC$ upwards to $MSC$. This internalizes the externality, increasing the price and reducing the quantity to the socially optimal level. (6 marks)
19. Price Ceilings:
    • Benefit: Lowers price for those who can afford the good.
    • Limitation: Creates a shortage (demand $>$ supply). Leads to black markets, queuing, or reduced quality as producers lose incentive. (8 marks)
20. Government Intervention Evaluation:
    • Argument for: Corrects externalities, provides public goods, reduces monopolies.
    • Argument against (Government Failure): Information failure (govt doesn't know the exact external cost), unintended consequences (black markets), and administrative costs.
    • Conclusion: Intervention is necessary but not always efficient; success depends on the quality of information and implementation. (10 marks)