Cambridge IGCSE Economics Case Study Practice | 剑桥IGCSE经济案例分析实战演练

📚 Cambridge IGCSE Economics Case Study Practice | 剑桥IGCSE经济案例分析实战演练

Case study questions are a central part of the Cambridge IGCSE Economics assessment. They test your ability to apply theoretical knowledge to real-world scenarios, analyse data, and develop reasoned arguments. This article provides a comprehensive step-by-step guide to mastering case study analysis, from identifying key concepts to writing high-scoring evaluation.

案例分析题是剑桥IGCSE经济学考核的核心部分。它考查你将理论知识应用到现实情境、分析数据以及展开有逻辑论证的能力。本文提供一份全面的分步指南，帮助你掌握案例分析技巧，从识别关键概念到写出高分评估。

1. Introduction to Case Studies in Economics | 经济学中的案例分析简介

A case study in economics presents a short scenario based on a real or hypothetical situation. It usually includes text, numerical data, a graph, or a table. Your task is to extract the economic problems, use appropriate terminology, and apply models such as demand and supply to explain what is happening and why.

经济学中的案例分析题会呈现一个基于真实或虚拟情境的简短场景。通常包含文字描述、数字数据、图表或表格。你的任务是提取经济问题，使用恰当的术语，并运用诸如需求和供给等模型来解释正在发生的事情及其原因。

Read the entire case study at least twice before writing anything.

在动笔之前，至少通读整个案例两遍。
Highlight economic terms, figures, and changes mentioned in the text.

标出文中提到的经济术语、数据和变化。
Identify the central economic problem the question expects you to address.

识别题目要求你解决的中心经济问题。

2. Identifying Key Economic Concepts | 识别关键经济概念

Every case study will contain several embedded economic concepts. Begin by scanning for keywords such as ‘price increase’, ‘subsidy’, ‘unemployment rate’, ‘monopoly power’, or ‘negative externality’. This step ensures you do not try to explain the scenario using common sense alone but instead ground your answers in economic theory.

每个案例分析题都会包含若干嵌入的经济概念。首先扫读关键词，如“涨价”、“补贴”、“失业率”、“垄断力量”或“负外部性”。这一步确保你不是仅凭常识解释情景，而是将答案建立在经济理论之上。

Keyword in Case	Likely Concept
‘Government sets a maximum rent’	Price ceiling
‘Factory emissions into a river’	Negative production externality
‘Only two firms dominate the market’	Duopoly / Oligopoly

表格举例：案例中的关键词与潜在经济概念。建立这种联系有助于快速找准分析方向。

3. Reading and Analysing the Case Material | 阅读与分析案例材料

Do not rush into writing. Spend five minutes breaking down the material. Look for cause-and-effect relationships. For example, ‘Due to rising costs of raw materials, Firm X has reduced output.’ Here, rising costs (cause) lead to reduced output (effect). Drawing a quick sketch of the demand and supply curves on the question paper can help you visualise the shift and its consequences on price and quantity.

不要急于动笔。花五分钟分解材料。寻找因果关系。例如，“由于原材料成本上升，X公司减少了产量。”这里，成本上升（原因）导致产量下降（结果）。在试卷上快速画出需求与供给曲线的草图，有助于你直观看到曲线的移动及其对价格与数量的影响。

Underline factors that shift demand (income, tastes, price of substitutes/complements) or supply (costs of production, technology, taxes, subsidies).

标出那些变动需求（收入、偏好、替代品/互补品价格）或供给（生产成本、技术、税收、补贴）的因素。
Calculate percentage changes if data is given; this prepares you for elasticity questions.

如果给出数据，计算百分比变化；这能为弹性问题做好准备。

4. Applying Demand and Supply | 应用需求与供给

The demand and supply model is the most frequently tested tool in IGCSE case studies. Always state clearly whether the demand curve or the supply curve shifts, in which direction (left or right), and what happens to the equilibrium price and quantity. Remember, a shift to the right is an increase, and a shift to the left is a decrease.

需求与供给模型是IGCSE案例分析中最常考查的工具。务必清晰说明是需求曲线还是供给曲线发生移动、向哪个方向移动（向左或向右），以及均衡价格和数量有何变化。记住，向右移动代表增加，向左移动代表减少。

For example, ‘An exceptionally cold winter destroys much of the tea harvest in Kenya.’ This is a decrease in supply (shift left). The equilibrium price will rise, and the equilibrium quantity will fall. If at the same time ‘a health report praises the benefits of drinking tea’, the demand curve shifts to the right, reinforcing the rise in price but possibly offsetting the fall in quantity.

例如，“一个异常寒冷的冬天摧毁了肯尼亚大部分茶叶收成。”这是供给减少（左移）。均衡价格将上升，均衡数量将下降。如果与此同时“一份健康报告称赞饮茶的好处”，需求曲线向右移动，这会强化价格的上升，但可能抵消数量的下降。

Effect on Price: upward pressure from both shifts → Price definitely rises.

价格效应：两个变动均带来上行压力 → 价格一定上升。

5. Understanding Elasticity in Context | 理解情境中的弹性

Elasticity concepts are often hidden in the narrative. When a case mentions that a firm’s total revenue fell after it raised the price, you are dealing with price elastic demand (PED > 1). When the case describes a staple food item with few substitutes, PED is likely inelastic. A sharp rise in demand for luxury holidays when GDP grows quickly points to a high income elasticity of demand (YED).

弹性概念常隐藏在叙述之中。当案例提到某公司提价后总收入下降时，你面对的就是富有价格弹性的需求（PED > 1）。当案例描述一种缺少替代品的主食时，PED很可能缺乏弹性。当GDP快速增长导致奢华假期需求急剧上升时，这表明需求的高收入弹性（YED）。

PED = %ΔQd ÷ %ΔP ; YED = %ΔQd ÷ %ΔY

PED = 需求量变动百分比 ÷ 价格变动百分比；YED = 需求量变动百分比 ÷ 收入变动百分比

Always link elasticity to a firm’s pricing strategy or the government’s tax policy. If demand is inelastic, a specific tax will be largely borne by consumers, and tax revenue for the government will be high.

始终将弹性与企业的定价策略或政府的税收政策联系起来。如果需求缺乏弹性，从量税将主要由消费者承担，政府税收收入也会较高。

6. Market Structures at Play | 市场结构的作用

Case studies often describe features of a market: the number of firms, type of product, barriers to entry, and availability of information. Use these clues to identify the market structure – perfect competition, monopoly, oligopoly, or monopolistic competition. This identification helps you predict behaviour, such as pricing power, efficiency, and the need for government regulation.

案例分析题常描述市场的特征：企业数量、产品类型、进入壁垒以及信息的可获得性。利用这些线索识别市场结构——完全竞争、垄断、寡头或垄断竞争。这一识别有助于你预测行为，如定价能力、效率及政府监管的必要性。

A large number of farmers selling identical wheat → perfect competition, price takers.

大量农民出售同质小麦 → 完全竞争，价格接受者。
Only two mobile network providers dominate the country → oligopoly, possible tacit collusion and non-price competition.

只有两家移动网络供应商主导全国市场 → 寡头，可能存在隐性共谋与非价格竞争。

7. Government Intervention and Policies | 政府干预与政策

Look for government actions mentioned: indirect taxes, subsidies, price controls (maximum/minimum prices), regulations, or fines. Analyse why the government intervenes. Common reasons include correcting market failure (externalities, public goods), supporting farmers or low-income households, or raising revenue. Draw the appropriate diagram to show the effect on market equilibrium.

留意提到的政府行为：间接税、补贴、价格管制（最高/最低价格）、法规或罚款。分析政府为何干预。常见原因包括纠正市场失灵（外部性、公共物品）、扶持农民或低收入家庭、或增加财政收入。画出相应的图示以显示对市场均衡的影响。

Example: A case states the government introduces a minimum price for milk to protect dairy farmers’ incomes. Explain that this is a price floor set above the equilibrium. At this higher price, quantity supplied exceeds quantity demanded, creating a surplus. The government usually purchases the excess supply or uses it for school programs.

举例：某案例称政府引入牛奶最低价格以保护奶农收入。解释这是高于均衡价格的最低限价。在这一较高价格下，供给量超过需求量，形成过剩。政府通常会购买过剩供给或将其用于学校项目。

8. Macroeconomic Objectives and Indicators | 宏观经济目标与指标

When the case includes GDP growth rates, inflation figures, unemployment statistics, or trade balances, switch to a macroeconomic lens. Relate these indicators to the government’s macroeconomic objectives: stable economic growth, low and stable inflation, low unemployment, and a satisfactory balance of payments. A case might show rising inflation and ask you to discuss the possible causes (demand-pull or cost-push) and policy responses (contractionary monetary or fiscal policy).

当案例包含GDP增长率、通胀数据、失业统计或贸易差额时，切换到宏观经济视角。将这些指标与政府的宏观经济目标联系起来：稳定的经济增长、低且稳定的通胀、低失业率和令人满意的国际收支。一个案例可能显示通胀上升，并要求你讨论可能的原因（需求拉动或成本推动）以及政策应对（紧缩性货币或财政政策）。

Indicator	Suggests
Unemployment rate 11%	Wasted resources; possible low aggregate demand
Current account deficit growing	Imports > exports; may need depreciation or protectionist measures

表格提示：根据指标做出合理推断，再讨论政策的利弊。

9. Critical Evaluation and Judgement | 批判性评估与判断

High marks are reserved for answers that go beyond mere description and offer balanced evaluation. This means considering both advantages and disadvantages of an action, acknowledging short-run versus long-run effects, and discussing the assumptions made. Use phrases such as ‘However, this depends on…’ or ‘On the other hand, it may lead to…’. An evaluation must always be directly tied to the context of the case study.

高分答案不仅是描述，还要给出平衡的评估。这意味着既要考虑某一措施的优点和缺点，也要承认短期与长期效应，并讨论所基于的假设。使用“然而，这取决于……”或“另一方面，它可能导致……”等表达。评估必须始终与案例情境直接相关。

If the government subsidises solar panels, do not just say it corrects a positive externality. Evaluate: the opportunity cost of public funds, and whether the subsidy might encourage overconsumption among the rich.

如果政府补贴太阳能板，不要只说它纠正了正外部性。应评估：公共资金的机会成本，以及补贴是否会鼓励富人过度消费。
When a firm gains monopoly power, discuss potential economies of scale and lower costs for consumers against the risk of higher prices and reduced choice.

当企业获得垄断力量时，讨论潜在的规模经济和消费者成本降低，与价格上涨和选择减少的风险。

10. Practice Example: The Coffee Market | 实战演练例题：咖啡市场

Case: The global coffee market is experiencing two simultaneous shocks. Due to a severe drought in Brazil, coffee bean yields have dropped by 30%. At the same time, a new scientific study is widely reported, linking moderate coffee consumption to a significantly lower risk of type 2 diabetes. The government in a large consuming country is also considering a 10% specific tax on roasted coffee to reduce caffeine-related health spending.

案例：全球咖啡市场正经历两个同时发生的冲击。由于巴西严重干旱，咖啡豆产量下降了30%。同时，一份新的科学研究被广泛报道，称适度饮用咖啡与显著降低2型糖尿病风险相关。一个大型消费国的政府还在考虑对烘焙咖啡征收10%的从量税，以减少与咖啡因相关的健康支出。

Question 1: Explain how the two initial shocks affect the equilibrium price and quantity of coffee. Use a demand and supply diagram in your answer.

问题1：解释这两个最初的冲击如何影响咖啡的均衡价格和数量。在答案中使用需求与供给图。

Answer step: The drought reduces supply – shift the supply curve to the left. The health study increases demand – shift the demand curve to the right. The equilibrium price unambiguously increases because both shifts exert upward pressure on price. The effect on equilibrium quantity is indeterminate; it depends on the relative size of the shifts. If the demand increase is larger than the supply decrease, quantity could rise; if the opposite, quantity falls. A diagram should clearly show two new curves intersecting at a higher price, with the quantity change ambiguous.

作答步骤：干旱减少供给——供给曲线左移。健康研究增加需求——需求曲线右移。均衡价格明确上升，因为两种移动都对价格产生上行压力。对均衡数量的影响不确定，取决于移动的相对幅度。如果需求增幅大于供给降幅，数量可能上升；反之，数量下降。图示应清晰显示两条新曲线相交于更高的价格，数量变化不确定。

Question 2: Assuming the specific tax is imposed, and the demand for coffee is price inelastic, analyse the incidence of the tax and the likely effect on government revenue.

问题2：假设从量税被征收，且咖啡的需求缺乏价格弹性，分析税收的归宿以及对政府收入可能产生的影响。

Answer step: With inelastic demand, consumers are less responsive to price changes. The supply curve shifts vertically upwards by the amount of the tax. The majority of the tax burden is passed onto consumers in the form of a higher price. Producers bear a smaller share. Because the quantity demanded does not fall significantly, the government collects substantial tax revenue. The base of the tax (quantity sold) remains high.

作答步骤：需求缺乏弹性，消费者对价格变化反应较小。供给曲线向上垂直移动税额的量。大部分税负以更高价格的形式转嫁给消费者。生产者负担较小份额。由于需求量没有显著下降，政府获得了可观的税收收入。税基（销量）依然很高。

11. Common Mistakes to Avoid | 常见错误避免

Many students lose marks not because they do not know the content, but because of avoidable errors. Typical pitfalls include confusing a shift of a curve with a movement along the curve, forgetting to label axes and curves on diagrams, using the price mechanism as an umbrella term without specifying supply and demand, and making assertions without citing evidence from the case.

很多学生失分并非因为不懂内容，而是因为可避免的错误。常见陷阱包括混淆曲线的移动与沿着曲线的运动，忘记在图表上标注坐标轴和曲线，笼统地使用价格机制却不具体说明供给与需求，以及不引用案例证据便做出断言。

Never write ‘the price will increase’ without stating whether it is due to a shift in demand or a shift in supply.

切勿只写“价格将上升”，而不说明是由于需求移动还是供给移动。
Avoid labelling a tax as simply a ‘cost’; explain it as a specific or ad valorem tax and show its effect on supply.

不要简单将税收称为“成本”；应解释它是一项从量税或从价税，并展示其对供给的影响。
Do not discuss economic policies without relating them to the objectives stated in the case.

讨论经济政策时，务必与案例中所述的目标相联系。

12. Final Tips for Exam Success | 考试成功终极提示

Practice with past papers under timed conditions. Before writing, quickly outline your answer in the margin: key terms, a sketch of the diagram, and two evaluation points. Allocate time based on the marks available – do not spend 20 minutes on a 4-mark question. Use precise economic vocabulary; instead of ‘money’, say ‘revenue’ or ‘income’ depending on the context. Ensure your final paragraph offers a reasoned judgement, weighing up the evidence from the case study.

使用往年真题进行限时练习。动笔前，在页边空白处快速列出答案大纲：关键术语、图表草稿和两个评估要点。根据分值分配时间——不要在一道4分题上花费20分钟。使用精确的经济学术语；根据语境，用“收入”或“收益”，而不是笼统的“钱”。确保你的最后一段提供有理有据的判断，对案例中的证据进行权衡。

The key to success is making the subject matter your own. Relate economic concepts to news stories and everyday life, so that when you encounter a new case study, you instinctively know which tools of analysis to reach for.

成功的关键是将学科知识内化为自己的东西。将经济概念与新闻和日常生活联系起来，这样当遇到一个新的案例分析题时，你便能本能地知道该调动哪些分析工具。

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Cambridge IGCSE Economics Case Study Practice | 剑桥IGCSE经济案例分析实战演练