📚 IGCSE CIE Economics: Typical Example Questions Explained | IGCSE CIE 经济：典型例题详解
This article walks you through several typical question styles encountered in IGCSE CIE Economics. For each example, we break down the key economic concepts, show step‑by‑step reasoning, and highlight common mistakes. By working through these model answers, you will learn how to apply theory to unfamiliar scenarios and structure your own responses effectively.
本文将通过几道 IGCSE CIE 经济学的典型例题，剖析核心概念、展示分步推理，并指出常见错误。通过研读这些标准答案，你将学会如何将理论运用于陌生情境，并有效地组织自己的答题思路。
1. Opportunity Cost and the Basic Economic Problem | 机会成本与基本经济问题
Example Question: A farmer owns a field that can be used to grow either 200 tonnes of wheat or 150 tonnes of corn. The farmer chooses to plant corn. Define opportunity cost and calculate the opportunity cost of this decision.
例题：一位农民拥有一块田地，可以种植200吨小麦或150吨玉米。农民选择种植玉米。请定义机会成本并计算这一决策的机会成本。
Opportunity cost is the value of the next best alternative forgone when a choice is made. It is not simply the monetary cost, but the benefit that would have been obtained from the best alternative use of the resource.
机会成本是做出选择时所放弃的次优选项的价值。它不仅仅是货币成本，而是资源用于第二最佳用途所能获得的收益。
In this case, the farmer gives up the wheat output when corn is produced. The opportunity cost of producing 1 tonne of corn is the amount of wheat that could have been produced with the same resources. Using the production ratios, the opportunity cost of the entire corn harvest is exactly 200 tonnes of wheat.
在这个例子中，农民种植玉米就放弃了小麦的收成。生产1吨玉米的机会成本，就是使用相同资源所能生产的小麦数量。根据产量比例，全部玉米收成的机会成本正好是200吨小麦。
If the farmer could sell wheat for a higher total revenue than corn, the decision would involve an implicit loss – the forgone income from wheat. Opportunity cost therefore highlights that ‘free’ resources are never truly free; choosing one use always means sacrificing another.
如果农民从小麦获得的总收入高于玉米，这个决策就包含了一项隐性损失——放弃的小麦收入。因此机会成本表明，‘免费’资源从来不是真正免费的；选择一种用途总是意味着牺牲另一种。
2. Shifts in Demand and Supply | 需求与供给的移动
Example Question: The market for bottled water is initially in equilibrium. A heatwave increases consumers’ desire for bottled water, while at the same time a fire disrupts plastic bottle production. Analyse the combined effect on equilibrium price and quantity.
例题：瓶装水市场起初处于均衡状态。热浪提高了消费者对瓶装水的需求，同时一场火灾中断了塑料瓶的生产。分析这两个事件对均衡价格和数量的综合影响。
The heatwave shifts the demand curve for bottled water to the right, as more consumers are willing and able to buy at every price. This puts upward pressure on both price and quantity.
热浪使瓶装水的需求曲线向右移动，因为更多消费者愿意并且能够在任何价格下购买。这对价格和数量都产生了向上的压力。
The fire in the plastic bottle factory raises the cost of packaging, reducing the supply of bottled water. The supply curve shifts leftward, which alone would increase price but decrease equilibrium quantity.
塑料瓶厂的火灾提高了包装成本，减少了瓶装水的供给。供给曲线向左移动，单独来看会提高价格但减少均衡数量。
When both curves shift simultaneously, equilibrium price unambiguously rises because demand increases and supply decreases both push price up. The change in quantity, however, is indeterminate without further information about the relative magnitudes of the shifts.
当两条曲线同时移动时，均衡价格无疑会上升，因为需求增加和供给减少都推动价格上涨。然而，在没有关于移动幅度相对大小的额外信息时，数量的变化是不确定的。
If the demand shift is larger than the supply shift, equilibrium quantity will rise. If the supply contraction dominates, quantity will fall. Exam questions often ask you to state this ambiguity and draw diagrams to illustrate the two possible outcomes.
如果需求移动幅度大于供给移动幅度，均衡数量将增加；如果供给收缩占主导，数量将下降。考题常常要求你指出这种不确定性，并画出图示呈现两种可能的结果。
3. Price Elasticity of Demand Calculation | 需求价格弹性计算
Example Question: When the price of a cinema ticket rises from £8 to £10, the quantity demanded per week falls from 1200 to 900 tickets. Calculate the price elasticity of demand (PED) using the average (midpoint) method and state whether demand is elastic or inelastic.
例题：当电影票价从8英镑上升到10英镑时，每周的需求量从1200张下降到900张。使用平均（中点）法计算需求的价格弹性，并说明需求是富有弹性还是缺乏弹性。
PED = (ΔQd ÷ Qd_av) ÷ (ΔP ÷ P_av)
The average quantity Qd_av = (1200+900)/2 = 1050. The average price P_av = (£8+£10)/2 = £9. The change in quantity ΔQd = -300, and the change in price ΔP = +£2.
平均需求量 Qd_av = (1200+900)/2 = 1050。平均价格 P_av = (8+10)/2 = 9。需求量变动 ΔQd = -300，价格变动 ΔP = +2。
PED = (-300 ÷ 1050) ÷ (2 ÷ 9) = (-0.2857) ÷ 0.2222 ≈ -1.285
Ignoring the negative sign, the magnitude is 1.285, which is greater than 1. Therefore, demand is elastic – consumers are relatively responsive to the price change.
忽略负号，弹性数值为1.285，大于1。因此需求富有弹性——消费者对价格变化相对敏感。
Elastic demand means that total revenue will move inversely with price. When the price rose from £8 to £10, total revenue fell from £9600 (8×1200) to £9000 (10×900), confirming the elastic nature of demand.
富有弹性意味着总收入与价格反向变动。当价格从8英镑升至10英镑时，总收入从9600英镑（8×1200）降至9000英镑（10×900），印证了需求的弹性性质。
| PED Value | Description | Effect on Total Revenue (price rise) |
|---|---|---|
| > 1 | Elastic | Revenue falls |
| = 1 | Unit elastic | Revenue unchanged |
| < 1 | Inelastic | Revenue rises |
4. Production Possibility Curve and Economic Growth | 生产可能性曲线与经济增长
Example Question: A country produces only two goods: consumer goods and capital goods. Use a production possibility curve (PPC) to illustrate the following: a point showing inefficient use of resources, a point that is currently unattainable, and the effect of technological progress in the capital goods industry.
例题：某国只生产两种产品：消费品和资本品。用生产可能性曲线说明以下情况：资源利用无效率的一点、目前无法达到的一点，以及资本品行业技术进步的影响。
A point inside the PPC, such as point U, represents unemployed or inefficiently allocated resources. The economy could produce more of both goods by moving towards the frontier.
PPC 内部的一点（如点U）代表资源未被充分利用或配置无效率。经济体可以通过向边界移动而生产更多的两种产品。
A point outside the PPC, like point X, is unattainable given current resources and technology. It can only be reached if the productive capacity of the economy expands.
PPC 外部的一点（如点X）在现有资源和技术下是无法达到的。只有当经济体的生产能力扩张时才能实现。
Technological progress in the capital goods industry causes the PPC to pivot outward along the capital goods axis. The maximum output of consumer goods remains unchanged, but more capital goods can now be produced for any given level of consumer goods.
资本品行业的技术进步会使 PPC 沿资本品轴线向外旋转。消费品的最大产出保持不变，但如今在任何消费品产量水平下都能生产更多的资本品。
This asymmetric shift illustrates that growth can be biased. In the long run, however, increased capital goods production expands the economy’s overall capacity, eventually shifting the entire curve outwards and benefiting both sectors.
这种不对称的移动说明增长可能是有偏向的。然而从长期看，资本品产量增加会扩大经济体的整体生产能力，最终使整条曲线向外移动，惠及两个部门。
5. Market Failure: Negative Externalities of Production | 市场失灵：生产的负外部性
Example Question: A steel factory discharges waste into a nearby river, harming the fishing industry and local residents. Explain why this leads to market failure and evaluate the use of a pollution tax to correct the problem.
例题：一家钢铁厂向附近河流排放废弃物，损害了渔业和当地居民。解释这为何导致市场失灵，并评价使用污染税来纠正问题的做法。
Market failure arises because the factory’s private costs of production (labour, materials, energy) ignore the external costs imposed on third parties. The social cost of steel production exceeds the private cost.
市场失灵的产生是因为工厂的私人生产成本（劳动力、原材料、能源）忽略了施加给第三方的外部成本。钢铁生产的社会成本超过了私人成本。
Firms only consider private costs when deciding output levels, so they produce at the point where private marginal cost equals marginal revenue. This leads to over‑production relative to the socially optimal level, where social marginal cost equals social marginal benefit.
企业在决定产量时只考虑私人成本，因此在私人边际成本等于边际收益处进行生产。这导致了相对于社会最优水平（社会边际成本等于社会边际收益）的过度生产。
A pollution tax equal to the marginal external cost at the socially efficient quantity can ‘internalise the externality’. The tax raises the firm’s private marginal cost curve upwards, prompting it to cut output to the socially optimal level.
与有效生产量下的边际外部成本相等的污染税可以‘将外部性内部化’。税收使企业的私人边际成本曲线上移，促使其将产量降至社会最优水平。
However, evaluation points include the difficulty of measuring the exact external cost, the risk that the tax may be passed on to consumers in higher prices, and the possibility that the firm relocates to a country with weaker environmental regulations. The effectiveness also depends on the price elasticity of demand for steel.
然而需要评价之处包括：难以精确衡量外部成本、税收可能以高价转嫁给消费者、企业可能搬迁至环境法规更宽松的国家。有效性还取决于钢铁的需求价格弹性。
6. Types and Causes of Unemployment | 失业的类型与原因
Example Question: Distinguish between cyclical (demand‑deficient) unemployment and structural unemployment. Explain why structural unemployment may be a more long‑term problem for an economy.
例题：区分周期性（需求不足型）失业和结构性失业。解释为何结构性失业对经济而言可能是一个更长期的问题。
Cyclical unemployment occurs when aggregate demand in the economy is insufficient to purchase the full‑employment level of output. It rises during recessions and falls during booms, closely following the business cycle.
周期性失业发生在经济中的总需求不足以购买充分就业产出水平时。它在衰退期间上升，在繁荣期间下降，紧随着经济周期波动。
Structural unemployment arises from a mismatch between the skills and location of workers and the requirements of available jobs. Causes include technological change, deindustrialisation, and the decline of certain regions.
结构性失业源于劳动者的技能和地理位置与现有工作岗位要求之间的错配。原因包括技术变革、去工业化和某些地区的衰落。
Cyclical unemployment can often be reduced by expansionary fiscal or monetary policy, as boosting aggregate demand encourages firms to hire more workers. Structural unemployment, however, cannot be cured simply by increasing demand.
周期性失业通常可以通过扩张性财政或货币政策来减少，刺激总需求会鼓励企业雇用更多工人。然而，结构性失业不能仅靠增加需求来治愈。
Structural unemployment requires supply‑side policies such as retraining programs, education reform, and incentives for geographical mobility. Because these policies take time to implement and to affect workers’ skills, structural unemployment tends to persist and can lead to hysteresis, where the long‑term unemployed lose employability.
结构性失业需要供给侧政策，如再培训计划、教育改革和地域流动激励。由于这些政策需要时间实施并影响工人技能，结构性失业往往持续存在，并可能导致滞后效应，即长期失业者丧失可雇佣性。
7. Monetary Policy and the Transmission Mechanism | 货币政策与传导机制
Example Question: The central bank of a country raises its policy interest rate. Using the monetary transmission mechanism, explain how this decision is intended to reduce inflationary pressure.
例题：某国中央银行提高政策利率。运用货币传导机制，解释这一决定如何旨在减轻通胀压力。
A higher policy rate increases the cost of borrowing for commercial banks, which then raise the interest rates they charge on loans and mortgages. This makes credit more expensive for households and firms.
较高的政策利率提高了商业银行的借款成本，进而推高了它们对贷款和抵押贷款收取的利率。这使信贷对家庭和企业来说更加昂贵。
Higher loan rates discourage consumer spending on durable goods and housing, as well as firms’ investment in capital. Both consumption (C) and investment (I) components of aggregate demand are negatively affected.
较高的贷款利率抑制了消费者对耐用品和住房的支出，以及企业的资本投资。总需求中的消费（C）和投资（I）部分都受到负面影响。
The fall in domestic demand reduces upward pressure on the general price level. Additionally, higher interest rates may attract foreign capital inflows, appreciating the exchange rate and making imports cheaper, which further dampens inflation.
国内需求的下降减轻了总体价格水平的上升压力。此外，较高的利率可能吸引外资流入，使本币升值，进口品变得更便宜，从而进一步抑制通货膨胀。
The strength of this transmission mechanism depends on the sensitivity of borrowing to interest rates, the state of consumer confidence, and the time lags involved. If businesses are pessimistic, even lower interest rates may fail to stimulate investment – a situation known as a ‘liquidity trap’ phenomenon in extreme cases.
这一传导机制的强度取决于借贷对利率的敏感性、消费者信心状况以及涉及的时滞。如果企业情绪悲观，即使利率降低也可能无法刺激投资——极端情况下即所谓的‘流动性陷阱’现象。
8. Exchange Rates and the Current Account | 汇率与经常账户
Example Question: A country experiences a depreciation of its currency. Explain the likely short‑run and long‑run effects on its current account balance, making reference to the Marshall‑Lerner condition.
例题：某国货币发生贬值。解释短期内和长期内对该国经常账户余额的可能影响，并提及马歇尔‑勒纳条件。
In the short run, depreciation makes exports cheaper in foreign currency terms and imports more expensive in domestic currency terms. However, the volume of exports and imports may not adjust immediately due to fixed contracts and consumer habits.
短期来看，贬值使出口品以外币计价变得更便宜，进口品以本币计价变得更昂贵。但由于合同固定和消费习惯，进出口数量可能不会立即调整。
Consequently, the current account may initially worsen – a phenomenon known as the J‑curve effect. The value of imports rises while export revenues lag, widening the deficit before improvement begins.
因此，经常账户最初可能恶化——这一现象被称为 J 曲线效应。进口价值上升而出口收入增长滞后，在改善开始之前先出现赤字扩大。
In the long run, if the sum of price elasticities of demand for exports and imports (in absolute terms) is greater than one – the Marshall‑Lerner condition – the depreciation will eventually improve the current account balance. Export volumes rise significantly, and import volumes fall sufficiently to outweigh the higher import prices.
长期来看，如果出口和进口需求价格弹性的绝对值之和大于1——即马歇尔‑勒纳条件——那么贬值最终会改善经常账户余额。出口数量大幅上升，进口数量下降幅度足以超过进口价格上涨的影响。
If the Marshall‑Lerner condition is not met because demand is relatively inelastic, the current account might not improve even in the long run. This is a key evaluative point, as structural factors such as the type of goods traded influence elasticities.
如果由于需求相对缺乏弹性而未能满足马歇尔‑勒纳条件，即使长期内经常账户也可能不会改善。这是一个关键的评估点，因为贸易商品类型等结构性因素会影响弹性大小。
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