A Level H1 Economics Microeconomics Quiz

Answer Key - A-Level Economics H1 Quiz (Microeconomics)

Section A: Fundamental Concepts & Elasticity

1. Opportunity Cost: The next best alternative foregone. In this case, the benefit of upgraded hospitals that is lost when funds are spent on the MRT line. [2]
2. Constraint: Fiscal constraint (limited budget/tax revenue) or administrative capacity. [1]
3. Movement vs Shift: Movement is caused by a change in the price of the good itself (change in quantity demanded). Shift is caused by non-price determinants (e.g., government grants for EVs, change in consumer tastes) affecting demand at all price levels. [4]
4. PED Calculation: $\text{PED} = \frac{-15\%}{10\%} = -1.5$. The absolute value is 1.5, which is $> 1$, therefore demand is elastic. [3]
5. PES (Surgical Services): Low PES because surgeons require extensive training and certification (time-consuming), and specialized equipment is capital-intensive. Supply cannot increase rapidly in response to price rises. [4]
6. YED & Inferior Goods: Inferior goods have a negative YED. As income rises, consumers switch to superior substitutes, causing the demand for inferior goods to decrease. [4]
7. Substitutes & PED: More substitutes $\rightarrow$ higher PED (more elastic). If price rises, consumers easily switch to alternatives, causing a larger drop in quantity demanded. [4]
8. Revenue & PED: If price $\uparrow$ and Total Revenue $\downarrow$, demand is elastic. The percentage decrease in quantity demanded outweighs the percentage increase in price. [4]

Section B: Market Structures & Efficiency

9. Perfect Competition: (i) Large number of buyers and sellers (no single firm influences price); (ii) Homogeneous products; (iii) Perfect information; (iv) No barriers to entry/exit. [4]
10. Monopoly Power: High barriers to entry (legal patents, economies of scale/natural monopoly, control of raw materials) prevent new firms from entering and competing away supernormal profits. [6]
11. Comparison: Monopoly: Higher price, lower output. Perfect Competition: Lower price (P=MC), higher output. [6]
12. Allocative Efficiency: Occurs where $P = MC$ (Price equals Marginal Cost), meaning resources are allocated according to consumer preferences. Achieved by Perfect Competition in the long run. [6]
13. Monopoly Prices: Not always higher. Mention "Price Discrimination" (some groups pay less) or "Natural Monopoly" where a single firm's AC is lower than multiple firms, potentially allowing lower prices if regulated. [8]
14. Natural Monopoly: Occurs when there are massive fixed costs and significant economies of scale. A single firm can supply the entire market at a lower average cost than two or more firms could. [6]

Section C: Market Failure & Government Intervention

15. Negative Externality: A cost imposed on a third party who is not part of the transaction. Example: Pollution from factories in Jurong Island affecting residents' health. [4]
16. Demerit Goods: Consumers under-estimate the long-term harm (information failure) and ignore negative externalities (passive smoking). This leads to over-consumption relative to the socially optimal level. [8]
17. Positive Externalities Diagram:
    • Diagram showing MPB, MSB, and MPC.
    • MSB > MPB.
    • Market equilibrium at $MPB = MPC$; Social optimum at $MSB = MPC$.
    • Result: Quantity consumed $Q_{market} < Q_{social}$, creating a deadweight loss. [10]
18. Public Goods: (i) Non-excludability: Cannot prevent non-payers from using it. (ii) Non-rivalry: One person's use does not reduce availability for others. [6]
19. Subsidies Evaluation:
    • Pros: Lowers price, increases quantity consumed toward social optimum.
    • Cons: Opportunity cost for government, risk of over-subsidizing (inefficiency), may benefit producers more than consumers. [12]
20. Asymmetric Info vs Externalities:
    • Asymmetric Info: Patients don't know the best treatment; doctors may over-prescribe (supplier-induced demand).
    • Externalities: Positive (healthier workforce) or Negative (antibiotic resistance).
    • Evaluation: Asymmetric info is more fundamental in healthcare because the transaction cannot even be optimized without correct information, whereas externalities are "spillover" effects. [12]