Part (a): Fixed Costs, Variable Costs, and Car Usage in Singapore (10 Marks)
[Point] The fixed costs of owning a new car refer to the costs that are independent of the extent to which the car is used and are incurred even if the car is not driven. Variable costs, conversely, are dependent on the extent to which the car is used and vary directly with the number of trips made.
[Explanation – The Singapore Context] For example, the fixed cost of owning a new car in Singapore includes the base open-market value of the car, the Additional Registration Fee (ARF – a massive tier-based tax), and most notably, the Certificate of Entitlement (COE) that must be purchased to legally own the car for 10 years. Variable costs include maintenance (such as replacing tyres), parking, and the cost of fuel, which rely entirely on the frequency of usage by the consumer.
[Exemplification – The COE System] In Singapore, the fixed costs of a car are exceptionally high. Due to the limited number of COEs available as part of Singapore’s vehicle quota system—a strict quantity restriction designed to curb car ownership—buyers must aggressively bid against each other for the right to own a vehicle. This causes the upfront price of COEs (often exceeding $100,000) to be astronomical compared to the variable costs (just a few thousand dollars annually) of actually driving the car.
[Insert CEO Quota Diagram: Rising Demand and Perfectly Price-Inelastic Supply leading to Surge in COE Price]
[Explanation – Income Elasticity & Supply] This vast discrepancy can be further understood through elasticity. The demand for cars, and thus for COEs, in affluent Singapore is high and increases more than proportionately to an increase in incomes, as cars are considered a luxury good (YED > 1). This surging demand, coupled with a supply of COEs that is perfectly price-inelastic (fixed strictly by the government quota), results in massive spikes in COE prices. This guarantees that fixed costs heavily dominate variable costs.
[Point – Behavioral Economics & The Sunk Cost Fallacy] This exceptionally high fixed cost, and the fact that it drastically exceeds the variable cost, directly results in greater car usage due to irrational consumer behavior driven by the sunk cost fallacy.
[Explanation – Traditional vs. Behavioral Theory] According to traditional economic theory, consumers act perfectly rationally; therefore, only marginal benefits and marginal costs (variable costs) should be considered when deciding whether to make an additional car trip. However, behavioral economics introduces the sunk cost fallacy—a psychological phenomenon whereby costs already incurred by economic agents, which cannot be recovered, improperly influence subsequent decision-making.
[Link] Due to the limited 10-year lifespan of the COE and its astronomical upfront price, consumers feel psychologically compelled to maximize their vehicle usage to “justify” the purchase and “get their money’s worth.” In comparison, the actual marginal costs of a single car trip (fuel and wear-and-tear) are negligible. This causes consumers to almost completely ignore marginal cost principles, focusing instead on spreading out their massive sunk costs over as many trips as possible to lower their perceived average fixed cost per trip. Thus, because consumers are subject to bounded rationality and the sunk cost fallacy, greater overall car usage occurs.
Part (b): Is Road Pricing the Most Appropriate Policy? (15 Marks)
[Introduction] Car usage generates significant negative externalities, such as air pollution (carbon emissions and PM2.5 particulates) and noise pollution. These external costs are borne by third parties, leading to a divergence between Marginal Private Cost (MPC) and Marginal Social Cost (MSC). This results in the over-consumption of car trips and a deadweight welfare loss to society. To address this, governments employ various policies, including road pricing.
[Point – Thesis (Road Pricing is Appropriate)] Road pricing, such as Singapore’s Electronic Road Pricing (ERP) system, acts as a Pigouvian tax on car usage. It is a highly appropriate policy because it directly targets the root cause of the environmental damage: the actual driving of the pollutive vehicle.
[Explanation & Exemplification] By charging a fee for road usage, the government forces motorists to internalize the external costs of their pollution. This increases the MPC of driving, shifting the MPC curve upwards until it aligns with the MSC curve. As a result, rational consumers will reduce their car usage from the free-market equilibrium (Qm) to the socially optimal level (Qs), effectively eliminating the over-allocation of resources and the deadweight welfare loss.
[Insert Market Failure Diagram: Costs / Benefits from Consumer viewpoint]
[Evaluation – Limitations of Road Pricing] However, the appropriateness and effectiveness of road pricing heavily depend on the price elasticity of demand (PED) for car usage. As established in Part (a), due to the sunk cost fallacy and high upfront fixed costs, the marginal demand for driving is highly price-inelastic. A standard road pricing charge may simply be absorbed by affluent motorists as a minor inconvenience rather than acting as a deterrent. Consequently, the toll would need to be raised to politically unpopular and highly inequitable levels to achieve any meaningful reduction in environmental damage.
[Point – Alternative Policy (Subsidizing Electric Vehicles)] Given the limitations of road pricing, alternative policies must be considered. As the preamble states, the high manufacturing cost of Electric Vehicles (EVs) currently reduces their purchase, keeping motorists reliant on highly pollutive petrol and diesel cars. Therefore, offering government subsidies for EVs is a highly appropriate alternative to specifically target emissions.
[Explanation & Exemplification] A subsidy lowers the cost of production for EV manufacturers, shifting the supply curve of EVs to the right and lowering their retail price. By making clean-energy cars cheaper, the positive cross-price elasticity of demand between petrol cars and EVs ensures that consumers will substitute away from pollutive vehicles. This reduces the environmental damage per trip made, tackling the pollution problem without restricting mobility. By reducing the Marginal External Cost (MEC), the MSC will shift closer to the MPC, which will increase the socially optimal amount to Qs’, reducing the extent of over-usage of cars and the welfare loss to society.
[Insert Market Failure Diagram with Effects of Policy as explained above]
[Evaluation – Limitations of EV Subsidies] Nevertheless, EV subsidies are not a silver bullet. While EVs reduce tailpipe emissions, they do not entirely eliminate environmental damage if the electricity used to charge them is still generated by burning fossil fuels (like natural gas). Furthermore, subsidizing cars does nothing to solve the other severe negative externality of car usage: traffic congestion.
[Concluding Section – Synthesis] In conclusion, road pricing is an essential and appropriate policy, but it is not the “most” appropriate choice when used in isolation, especially when the demand for driving is highly price-inelastic. The most appropriate policy choice is a comprehensive, multi-pronged approach. Road pricing is necessary to manage overall traffic volume. However, to specifically target environmental damage, it must be heavily complemented by supply-side policies—such as EV subsidies to make green technology affordable—and massive investments in public transport infrastructure (like the MRT system). Only by providing a cheap, efficient substitute (public transport) will the demand for car usage become price-elastic enough for road pricing to truly work as intended.
💡 Chief Tutor’s A-Level (H2) Breakdown: This response screams “Grade A” because it directly references the preamble in its evaluation. Many students will just write a generic essay about taxes vs. quotas. By explicitly identifying the high cost of EVs from the question’s preamble and suggesting EV subsidies as the alternative policy, you prove to the Cambridge examiner that you are answering the specific question in front of you, easily securing the L3 and E3 bands.
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