📚 Typical Exam Questions Explained | GCSE CIE 经济：典型例题详解
Mastering GCSE CIE Economics requires not just learning theories but also knowing how to apply them under exam conditions. This article breaks down classic question types, from demand-supply shifts to macroeconomic policies, showing you step-by-step how to secure full marks.
想在 GCSE CIE 经济学中拿高分，不仅要掌握理论，更要学会在考试中灵活运用。本文拆解从供需变动到宏观经济政策的经典例题，一步步教你如何拿到满分。
1. Understanding Demand and Supply Shifts | 理解需求与供给的变动
Sample question: The government imposes a tax on sugary drinks. Using a demand and supply diagram, explain how this affects the market equilibrium for sugary drinks. [4 marks]
例题： 政府对含糖饮料征税。运用需求与供给图，解释这如何影响含糖饮料的市场均衡。[4分]
To answer, start by stating that a tax increases the cost of production, shifting the supply curve to the left from S1 to S2. The new equilibrium has a higher price (P2) and a lower quantity (Q2). Even though demand hasn’t shifted, the tax burden is shared between consumers (higher price) and producers (lower net revenue).
回答时，先指出税收增加了生产成本，使供给曲线从 S1 向左平移至 S2。新的均衡价格更高 (P2)，数量更低 (Q2)。尽管需求未变动，但税收负担由消费者（支付更高价格）和生产者（净收入减少）共同承担。
A common mistake is drawing a demand shift instead. Remember: taxes on goods directly affect supply, not demand. Also, label your diagram clearly and refer to it in the explanation to secure all four marks.
常见错误是绘制需求曲线移动。记住：对商品征税直接影响供给，而非需求。此外，图中需清晰标注，并在解释中引用图示，才能拿到全部分数。
2. Price Elasticity of Demand (PED) Calculation | 需求价格弹性计算
Sample question: A cinema reduces ticket prices from $10 to $8, and daily ticket sales rise from 200 to 260. Calculate the PED and state whether demand is elastic or inelastic. [3 marks]
例题： 一家影院将票价从 $10 降至 $8，日售票量从 200 张升至 260 张。计算 PED 并说明需求是富有弹性还是缺乏弹性。[3分]
Use the formula: PED = (% change in quantity demanded) / (% change in price). Percentage change in quantity = (60/200) x 100 = 30%. Percentage change in price = (-2/10) x 100 = -20%. Thus, PED = 30% / -20% = -1.5 (ignore the minus sign when describing elasticity, value is 1.5). Since 1.5 > 1, demand is price elastic.
使用公式：PED = （需求量变动百分比）/（价格变动百分比）。需求量变动百分比 = (60/200) × 100 = 30%。价格变动百分比 = (-2/10) × 100 = -20%。所以 PED = 30% / -20% = -1.5（描述弹性时忽略负号，数值为 1.5）。由于 1.5 大于 1，需求是富有弹性的。
For full marks, show the formula, the working, and a concluding statement about elasticity. Knowing that elastic demand means total revenue rises when price falls (and vice versa) can help you answer follow-up questions.
要拿满分，需展示公式、计算过程，并写出关于弹性的结论。理解富有弹性意味着降价时总收入上升（反之亦然），有助于回答后续提问。
3. Market Failure and Negative Externalities | 市场失灵与负外部性
Sample question: Explain how the production of chemicals can lead to market failure. Use a diagram to support your answer. [6 marks]
例题： 解释化学品生产如何导致市场失灵，并用图示支持你的回答。[6分]
Chemical production often causes pollution – a negative externality. The private cost to the firm ignores the external cost (e.g. health problems, clean-up). This leads to overproduction, as the market equilibrium is at Qp (where private marginal cost equals marginal benefit), not at Qs (the socially optimal level where social marginal cost equals marginal benefit). Market failure occurs because resources are misallocated.
化学品生产常造成污染——一种负外部性。企业的私人成本忽略了外部成本（如健康问题、清理费用）。这导致过度生产，因为市场均衡位于 Qp（私人边际成本等于边际收益），而非 Qs（社会边际成本等于边际收益的最优水平）。市场失灵是因为资源配置不当。
Draw two curves: marginal private cost (MPC) and marginal social cost (MSC), with MSC lying above MPC. Show the vertical distance between them as the external cost. Label the free-market quantity (Qp) and the socially efficient quantity (Qs). The shaded triangle of welfare loss reinforces why government intervention (e.g. a tax) may be needed.
绘制两条曲线：边际私人成本 (MPC) 和边际社会成本 (MSC)，MSC 位于 MPC 上方。两条曲线之间的垂直距离即外部成本。标出自由市场产量 (Qp) 和社会有效产量 (Qs)。福利损失三角阴影进一步说明为何可能需要政府干预（如征税）。
4. Production Possibility Curve (PPC) and Opportunity Cost | 生产可能性曲线与机会成本
Sample question: A country can produce either 500 units of consumer goods or 200 units of capital goods. Describe the opportunity cost of producing an extra 50 units of capital goods. [3 marks]
例题： 一国可以生产 500 单位消费品或 200 单位资本品。描述多生产 50 单位资本品的机会成本。[3分]
On the PPC, moving from capital goods = 0 to capital goods = 50 means sacrificing some consumer goods. The ratio is 500 consumer : 200 capital, i.e. 2.5 consumer goods per unit of capital. An extra 50 units of capital goods therefore cost 50 x 2.5 = 125 units of consumer goods. That is the opportunity cost.
在 PPC 上，从资本品 = 0 移动到资本品 = 50 意味着牺牲部分消费品。比例为 500 消费品 : 200 资本品，即每单位资本品需放弃 2.5 单位消费品。因此多生产 50 单位资本品的机会成本为 50 × 2.5 = 125 单位消费品。
Always define opportunity cost in your answer: ‘the next best alternative forgone’. The PPC illustrates this trade-off. If the country is currently at full employment, increasing capital goods requires a shift of resources from consumer goods production – the foregone consumer goods represent the opportunity cost.
回答中务必先定义机会成本：“所放弃的次优选择”。PPC 展示了这种权衡。若该国处于充分就业状态，增加资本品就需要将资源从消费品生产中转移出来——被放弃的消费品就是机会成本。
5. Fiscal Policy – Government Spending and Taxation | 财政政策 – 政府支出与税收
Sample question: During a recession, the government increases spending on infrastructure and simultaneously raises income tax. Analyse the likely impact on aggregate demand and economic growth. [6 marks]
例题： 在经济衰退期，政府一方面增加基础设施支出，同时提高所得税。分析这对总需求和经济增长可能带来的影响。[6分]
Increased government spending directly boosts aggregate demand (AD = C+I+G+(X-M)), shifting the AD curve to the right and encouraging economic growth. However, higher income tax reduces households’ disposable income, which lowers consumption (C). This partially offsets the expansionary effect.
增加政府支出直接提振总需求 (AD = C+I+G+(X-M))，使 AD 曲线右移，促进经济增长。然而，提高所得税会减少家庭可支配收入，从而降低消费 (C)。这一紧缩效应部分抵消了扩张作用。
The net effect depends on the magnitudes. If the spending multiplier is larger than the tax multiplier, AD still increases. You should also mention possible supply-side improvements from infrastructure (long-term growth). But weaker consumer spending could dampen the recovery. Include both sides to demonstrate analysis skills.
净效果取决于两者力度。若支出乘数大于税收乘数，AD 仍会增长。还应提及基础设施可能带来的供给侧改善（长期增长）。但消费支出疲软可能抑制复苏。正反两面分析可展示分析能力。
6. Exchange Rate Depreciation and Trade | 货币贬值与贸易
Sample question: A country’s currency depreciates by 15% against its main trading partners. Explain how this could affect its current account balance. [5 marks]
例题： 某国货币对其主要贸易伙伴贬值 15%。解释这将如何影响其经常账户余额。[5分]
Depreciation makes exports cheaper for foreign buyers, so export volume should rise. Imports become more expensive, so import volume should fall. This combination tends to improve the current account (X-M becomes larger). However, in the short term, the Marshall-Lerner condition must hold: the sum of price elasticities of demand for exports and imports must be greater than 1 for the trade balance to improve.
货币贬值使出口品对外国买家更便宜，因此出口量应上升。进口品变得更贵，进口量应下降。这种组合倾向于改善经常账户（X-M 变大）。但短期内需满足马歇尔-勒纳条件：出口和进口的需求价格弹性之和必须大于 1，贸易收支才会改善。
Initially, the current account might worsen (J-curve effect) because contracts are fixed and volumes adjust slowly. Also, if the country imports essential raw materials (inelastic demand), import spending could rise sharply, offsetting gains. Use these points to develop a high-level answer.
最初经常账户可能恶化（J 曲线效应），因为合同固定且数量调整缓慢。此外，若该国进口必需原材料（需求缺乏弹性），进口支出可能大幅上升，抵消收益。利用这些要点可写出高分答案。
7. Types of Unemployment | 失业的类型
Sample question: ‘Unemployment caused by a downturn in the economy is more damaging than unemployment caused by technological change.’ Do you agree? Justify your view. [6 marks]
例题： “经济衰退造成的失业比技术变革造成的失业更具破坏性。” 你是否同意？请论证你的观点。[6分]
Cyclical unemployment (due to recession) affects many sectors at once, reduces incomes, and lowers aggregate demand further – creating a vicious cycle. It can persist for years if the economy is slow to recover. Structural unemployment (due to technology) is often concentrated in specific industries where workers’ skills become obsolete. While painful for those individuals, the overall economy can still grow as new jobs emerge.
周期性失业（由衰退引起）会同时冲击多个部门，减少收入，并进一步降低总需求——形成恶性循环。若经济复苏缓慢，可能持续数年。结构性失业（由技术引起）通常集中在某些行业，工人的技能被淘汰。虽然对个人而言痛苦，但整体经济仍可因新岗位的出现而增长。
A balanced answer might argue that cyclical unemployment is more damaging in the short term for the macroeconomy, but structural unemployment can cause long-lasting regional decline and inequality if workers cannot retrain. Both require different policy responses: stimulus for cyclical, education/training for structural.
平衡的答案可能主张：短期看周期性失业对宏观经济的破坏更大，但若工人无法接受再培训，结构性失业可能导致持久的地区衰退和不平等。两者需要不同的政策应对：周期性失业需刺激措施，结构性失业需教育/培训。
8. Causes of Inflation: Cost-Push vs. Demand-Pull | 通货膨胀的成因：成本推动与需求拉动
Sample question: Rising global oil prices have led to higher inflation in a country that is a net importer of oil. Explain this type of inflation and outline one monetary policy to control it. [4 marks]
例题： 全球油价上涨导致一个石油净进口国通胀上升。解释这种通胀类型，并概述一种控制它的货币政策。[4分]
This is cost-push inflation because higher oil prices increase production and transport costs for firms, shifting the aggregate supply (AS) curve to the left. The price level rises while real GDP may fall (stagflation). One monetary policy response is to raise the central bank’s interest rate. This discourages borrowing and spending, reducing demand-side pressure, though it does not directly tackle the supply shock.
这是成本推动型通胀，因为油价上涨增加了企业的生产和运输成本，使总供给 (AS) 曲线左移。价格水平上升，而实际 GDP 可能下降（滞胀）。一种货币政策应对是提高央行利率。这会抑制借贷和支出，减轻需求侧压力，尽管并未直接解决供给冲击。
For full marks, name the inflation type, link oil prices to AS shift, and specify the monetary tool (interest rate). Mention that higher rates can strengthen the currency, making oil imports cheaper in local currency – an extra point to show deeper understanding.
要拿满分，需点明通胀类型，将油价与 AS 移动联系起来，并具体说明货币政策工具（利率）。提一句提高利率可能使本币走强，从而降低以本币计价的石油进口成本——这是展示深层理解的加分点。
9. Government Intervention: Maximum Price (Price Ceiling) | 政府干预：最高限价
Sample question: A government sets a maximum price on rented housing below the market equilibrium. Explain the likely consequences in the housing market. [5 marks]
例题： 政府对租赁住房设定低于市场均衡的最高限价。解释住房市场可能出现的后果。[5分]
A binding maximum price creates a shortage because quantity demanded exceeds quantity supplied. Landlords may reduce maintenance or convert properties to other uses, lowering quality. A black market might develop where tenants pay extra ‘key money’. Fewer new rental units will be built, worsening the long-term supply.
有约束力的最高限价会造成短缺，因为需求量超过供给量。房东可能减少维护或将房产转为其他用途，降低质量。黑市可能滋生，租户需支付额外“钥匙费”。新建出租房源减少，长期供给恶化。
Include a simple diagram showing the price ceiling below equilibrium, the gap between Qd and Qs being the shortage. Also discuss whether the policy meets its equity goal: lower-income households may benefit, but shortages often harm the very people the policy is meant to help.
用简单图示展示低于均衡的最高限价，以及 Qd 与 Qs 之间的缺口即短缺。同时讨论政策是否实现了公平目标：低收入家庭可能受益，但短缺往往反而伤害了政策本欲帮助的人群。
10. International Trade and Comparative Advantage | 国际贸易与比较优势
Sample question: Country A can produce 1 unit of cloth using 2 hours of labour or 1 unit of wine using 4 hours. Country B can produce 1 unit of cloth in 3 hours and 1 unit of wine in 3 hours. Explain which country has a comparative advantage in cloth. [4 marks]
例题： A 国生产 1 单位布匹需 2 小时劳动，生产 1 单位葡萄酒需 4 小时。B 国生产 1 单位布匹需 3 小时，生产 1 单位葡萄酒需 3 小时。解释哪国在布匹生产上具有比较优势。[4分]
First, calculate opportunity costs. For Country A, 1 unit of cloth costs 0.5 units of wine (2h/4h). For Country B, 1 unit of cloth costs 1 unit of wine (3h/3h). Country A has the lower opportunity cost in cloth (0.5 < 1), so Country A has a comparative advantage in cloth.
首先计算机会成本。对 A 国而言，1 单位布匹的机会成本为 0.5 单位葡萄酒 (2h/4h)。对 B 国，1 单位布匹的机会成本为 1 单位葡萄酒 (3h/3h)。A 国生产布匹的机会成本更低 (0.5 小于 1)，因此 A 国在布匹上具有比较优势。
Even though Country B is equally efficient in both goods (absolute advantage in neither), there are still gains from trade if each specialises according to comparative advantage: A produces cloth, B produces wine. State this principle clearly. Diagrams are not essential here, but a well-labelled table of opportunity costs earns full marks.
尽管 B 国两种商品生产效率相同（没有绝对优势），但两国按比较优势专业化生产（A 生产布匹，B 生产葡萄酒）仍可从贸易中获益。清楚地阐述这一原理即可。此处图表非必需，但一份标注清晰的机会成本表格可助你拿到满分。
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