📚 CIE IGCSE Economics: Case Study Practical Drill | CIE IGCSE 经济：案例分析实战演练
Mastering case study questions is essential for success in CIE IGCSE Economics. These questions test your ability to apply economic theory to real-world situations, interpret data, and evaluate policy options. This guide provides a practical drill using a sample case study on the urban electric scooter market to sharpen your analytical skills.
掌握案例分析题是 CIE IGCSE 经济考试成功的关键。这类题目考查你将经济理论应用于现实情境、解读数据、评估政策方案的能力。本指南将通过一个城市电动滑板车市场的模拟案例进行实战演练，提升你的分析技能。
1. Understanding the Case Study | 理解案例背景
Begin by reading the case study carefully. Identify the main topic—in this example, the growing market for electric scooters in a city—and underline key data such as price changes, quantities, policy proposals, and stakeholder opinions.
首先仔细阅读案例。确定主题——本例为城市电动滑板车市场的发展——并标注关键数据，如价格变化、数量、政策建议以及相关方意见。
Note any specific economic terms used, such as 'subsidy', 'negative externality', 'price elasticity', or 'market failure'. These terms will guide your analysis.
留意使用的具体经济术语，如“补贴”、“负外部性”、“价格弹性”或“市场失灵”。这些术语将引导你的分析方向。
2. Identifying Economic Concepts | 识别经济学概念
Extract the underlying economic concepts. For the electric scooter case, rising demand may stem from increased environmental awareness and government promotion. This is a shift of the demand curve to the right.
提炼核心的经济学概念。在电动滑板车案例中，需求增长可能源于环保意识增强和政府推广。这表现为需求曲线向右平移。
On the supply side, falling battery costs and technological improvements shift the supply curve to the right, reducing prices and increasing quantity.
在供给方面，电池成本下降和技术进步使供给曲线向右平移，从而降低价格、增加数量。
Concepts such as price elasticity of demand (PED) for scooters, cross elasticity with substitutes like bicycles, and income elasticity are relevant. Additionally, the case might mention traffic congestion or accidents, introducing negative externalities and market failure.
与滑板车相关的需求价格弹性（PED）、对自行车等替代品的交叉弹性以及收入弹性等概念都很重要。此外，案例可能提到交通拥堵或事故，这引入了负外部性和市场失灵。
3. Interpreting Data and Diagrams | 解读数据和图表
Case studies often include a table of data or a diagram. For instance, you might see a table showing the number of scooters sold at different prices over two years, or a supply-demand diagram with shifts.
案例分析常包含数据表格或图表。例如，你可能看到一张显示两年间不同价格下滑板车销售量的表格，或带有曲线移动的供需图。
When interpreting a diagram, first identify the original equilibrium P1 and Q1. Then observe which curves shift and why. A rightward demand shift due to eco-consciousness would increase both price and quantity, while a simultaneous rightward supply shift from lower costs might offset the price increase but further boost quantity.
解读图表时，首先确定初始均衡点 P1 和 Q1。然后观察哪条曲线移动及其原因。环保意识引起的需求右移会同时提高价格和数量，而成本下降引起的供给右移可能抵消价格上涨，但进一步增加数量。
Always relate data movements to theoretical causes. Use these insights to answer specific questions, such as 'Explain why the equilibrium price of scooters has remained stable despite a surge in demand.'
始终将数据变动与理论原因联系起来。利用这些洞察来回答特定问题，例如“解释为什么尽管需求激增，滑板车的均衡价格仍保持稳定”。
4. Applying Price Elasticity Analysis | 应用价格弹性分析
Price elasticity of demand is a common tool. If the case states that a 10% price cut led to a 20% increase in quantity demanded, you can calculate PED.
需求价格弹性是常用工具。若案例提到降价 10% 导致需求量增加 20%，便可计算 PED。
PED = %ΔQd / %ΔP = 20% / 10% = 2
A PED of 2 indicates elastic demand. Thus a price reduction will increase total revenue. This conclusion can be used to advise firms or evaluate a tax policy.
PED 为 2 表明需求富有弹性。因此降价会增加总收益。该结论可用于为企业提供建议或评估税收政策。
Similarly, price elasticity of supply (PES) measures how responsive quantity supplied is to price changes. If the case mentions that scooter manufacturers can quickly ramp up production due to flexible manufacturing, PES is likely elastic.
同样，供给价格弹性（PES）衡量供给量对价格变化的反应程度。如果案例提到滑板车制造商因柔性生产能迅速增产，则 PES 很可能富有弹性。
When answering, always define the concept, provide the formula, plug in numbers, and interpret the result in the context of the case study.
作答时，始终定义概念、给出公式、代入数字，并结合案例背景解读结果。
5. Evaluating Government Policies | 评估政府政策
The case may propose a government subsidy on electric scooters to promote green transport. Analyze using a supply-demand diagram: a subsidy shifts the supply curve right, lowers consumer price and increases quantity consumed.
案例可能提议对电动滑板车提供政府补贴以推广绿色交通。用供需图分析：补贴使供给曲线右移，降低消费者支付价格，增加消费量。
However, evaluation is crucial. Discuss opportunity cost of public funds, potential burden on taxpayers, and whether the subsidy might encourage over-consumption leading to congestion – a negative externality.
但评估至关重要。讨论公共资金的机会成本、对纳税人的负担，以及补贴是否可能鼓励过度消费导致拥堵——一种负外部性。
Alternatively, consider a tax on petrol scooters. This would shift the supply for those leftwards, potentially shifting demand towards electric scooters. Cross-elasticity becomes relevant.
另外，考虑对燃油滑板车征税。这会使其供给左移，可能将需求转向电动滑板车。此时交叉弹性变得相关。
Weigh the advantages and disadvantages of each policy measure, referring to stakeholders such as consumers, producers, government, and the environment.
权衡每项政策措施的优势和劣势，并提及消费者、生产者、政府和环境等利益相关者。
6. Discussing Market Failure and Externalities | 讨论市场失灵与外部性
Electric scooters may cause negative externalities: accidents, sidewalk clutter, or increased electricity demand from non-renewable sources. This leads to market failure where the free market over-produces from society's perspective.
电动滑板车可能产生负外部性：事故、人行道杂乱，或非可再生能源发电需求的增加。这导致市场失灵，即从社会角度看自由市场生产过剩。
Draw a marginal social cost (MSC) curve above the marginal private cost (MPC) curve. The socially optimal output Q* is lower than the free-market output Qm. A tax equal to the external cost could internalize the externality.
画出边际社会成本（MSC）曲线高于边际私人成本（MPC）曲线。社会最优产出 Q* 低于自由市场产出 Qm。征收等于外部成本的税收可以使外部性内在化。
Positive externalities also exist, such as reduced air pollution compared to cars. A subsidy could align private and social benefits.
也存在正外部性，例如相对于汽车而言减少了空气污染。补贴可以使私人收益与社会收益趋向一致。
In your answer, identify the type of externality, illustrate with a diagram description, and propose appropriate government interventions with evaluation of their effectiveness and drawbacks.
作答时，识别外部性类型，用图示描述说明，并提出适当的政府干预措施，同时评估其有效性和缺陷。
7. Structuring a Balanced Argument | 构建均衡的论证
High-level answers balance analysis and evaluation. Start with definitions and a clear diagram explanation. Then build a point-by-point argument: 'On one hand, ... On the other hand, ...'.
高分答案兼顾分析与评估。从定义和清晰的图表解释入手，然后构建逐点论证：“一方面……另一方面……”。
For a question like 'Discuss the effectiveness of a subsidy on electric scooters,' present arguments for (encourages eco-transport, reduces pollution) and against (cost to taxpayers, possible congestion). Conclude with a justified judgment.
对于“讨论电动滑板车补贴的有效性”这类问题，陈述支持论点（鼓励生态交通、减少污染）和反对论点（纳税人成本、可能拥堵）。最后给出有依据的判断。
Use connectives such as 'however', 'moreover', 'in contrast', and refer to the specific context of the case study to show application.
使用“然而”、“此外”、“相比之下”等连接词，并引用案例的具体背景，以展示应用能力。
8. Model Case Study and Example Answers | 模拟案例与答案示例
Let's apply these skills to a condensed case. The city of Greenville has witnessed a 30% increase in electric scooter sales. The government contemplates a $50 per-unit subsidy to manufacturers. Simultaneously, hospitals report a 10% rise in scooter-related injuries. See the data below.
让我们将这些技巧应用到一个精简案例中。格林维尔市电动滑板车销量增长了30%。政府考虑向制造商提供每辆50美元的补贴。同时，医院报告滑板车相关伤害增加了10%。见下表。
| Scenario | Price (USD) | Quantity (units/month) |
|---|---|---|
| Before subsidy | 300 | 5000 |
| After subsidy (manufacturer) | 250 (consumer pays) | 6500 |
Question 1: Explain how the $50 subsidy affects the market equilibrium.
问题1：解释50美元补贴如何影响市场均衡。
Model Answer: A subsidy lowers the cost of production, shifting the supply curve to the right from S1 to S2. This increases the equilibrium quantity from 5000 to 6500 units and reduces the price consumers pay from $300 to $250. Producers receive the consumer price plus the subsidy, i.e., $300. The price mechanism reallocates resources toward scooter production.
参考答案：补贴降低生产成本，使供给曲线从 S1 右移至 S2。这使均衡数量从 5000 辆增加到 6500 辆，消费者支付价格从 300 美元降至 250 美元。生产者获得消费者支付价格加补贴，即 300 美元。价格机制将资源重新分配至滑板车生产。
Question 2: Discuss whether the subsidy is the most effective policy to address the negative externalities of increased scooter injuries.
问题2：讨论补贴是否是解决滑板车伤害负外部性的最有效政策。
Model Answer: Subsidies encourage consumption, which
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