📚 IGCSE CCEA Economics: Typical Question Walkthroughs | IGCSE CCEA 经济：典型例题详解
Mastering IGCSE CCEA Economics requires not only understanding the theory but also knowing how to apply it to exam questions. This article walks you through ten typical questions, each covering a key topic from the specification, with clear bilingual explanations. By studying these worked examples, you will learn how to structure answers, apply economic models, and tackle both multiple-choice and structured questions with confidence.
掌握 IGCSE CCEA 经济学不仅需要理解理论，还要知道如何将其应用到考题中。本文带你详解十个典型例题，每个题目覆盖大纲中的关键主题，并提供清晰的双语解析。通过学习这些解答范例，你将学会如何组织答案、运用经济模型，并自信地应对选择题与结构化问题。
1. Demand and Supply – Shifts and Equilibrium | 需求与供给——变动与均衡
Question: The market for cinema tickets is initially in equilibrium. There is a sharp increase in the popularity of online streaming services, and at the same time cinema workers negotiate a significant wage rise. Which of the following is most likely to happen to the equilibrium price and quantity of cinema tickets? A. Price rises, quantity falls. B. Price falls, quantity falls. C. Price change is uncertain, quantity falls. D. Price rises, quantity rises.
问题：电影票市场最初处于均衡状态。在线流媒体服务的受欢迎程度急剧上升，同时影院员工通过谈判获得了大幅加薪。以下哪一项最有可能是电影票的均衡价格与数量发生的变化？A. 价格上升，数量下降。B. 价格下降，数量下降。C. 价格变化不确定，数量下降。D. 价格上升，数量上升。
Answer and explanation: The demand for cinema tickets decreases because streaming services are a substitute, shifting the demand curve to the left. The supply of cinema tickets decreases because higher wages raise production costs, shifting the supply curve to the left. Both a leftward shift of demand and a leftward shift of supply reduce the equilibrium quantity, so quantity unambiguously falls. The effect on price depends on the relative magnitudes of the shifts: decreasing demand pushes price down, while decreasing supply pushes price up. Since the net effect on price is ambiguous, the price may rise, fall, or stay the same. The correct answer is therefore C.
答案与解析：对电影票的需求因替代品流媒体服务的增多而下降，需求曲线向左移动。电影票的供给因工资上升导致生产成本增加而下降，供给曲线向左移动。需求左移与供给左移都会减少均衡数量，因此数量必然下降。对价格的影响取决于移动幅度的对比：需求减少使价格下跌，供给减少使价格上涨，净效果不明确，价格可能上升、下降或不变。因此正确答案为 C。
2. Price Elasticity of Demand (PED) | 需求价格弹性 (PED)
Question: A crisp manufacturer sells 800 packets per week at a price of £1.50. To boost sales, the price is reduced to £1.20, and weekly sales rise to 1,040 packets. Calculate the price elasticity of demand using the standard percentage formula. Interpret the value and explain what will happen to the firm's total revenue.
问题：一家薯片制造商以每包 1.50 英镑的价格每周销售 800 包。为促进销售，价格降至 1.20 英镑，每周销量升至 1,040 包。使用标准百分比公式计算需求价格弹性。解释该数值，并说明企业的总收益将如何变化。
Answer and explanation: First calculate the percentage changes. %ΔQd = [(1,040 − 800) / 800] × 100 = (240/800) × 100 = 30%. %ΔP = [(1.20 − 1.50) / 1.50] × 100 = (−0.30/1.50) × 100 = −20%. PED = %ΔQd / %ΔP = 30% / −20% tely larger rise in quantity demanded, so total revenue increases. Original revenue: 800 × £1.50 = £1,200. New revenue: 1,040 × £1.20 = £1,248. Revenue rises by £48, confirming the PED result.
答案与解析：首先计算百分比变动。需求量变化百分比 = [(1,040 − 800) / 800] × 100 = 30%。价格变化百分比 = [(1.20 − 1.50) / 1.50] × 100 = −20%。PED = 30% / −20% = −1.5。去掉负号，绝对值为 1.5，大于 1，因此需求富有弹性。当需求富有弹性时，价格下降会导致需求量更大幅度的上升，因而总收益增加。原收益：800 × 1.50 = 1,200 英镑。新收益：1,040 × 1.20 = 1,248 英镑，增加了 48 英镑，印证了 PED 的判断。
3. Production and Costs – Break-even Analysis | 生产与成本——盈亏平衡分析
Question: A startup produces handmade candles. Monthly fixed costs are £2,500. Each candle incurs a variable cost of £5 for materials and labour, and sells for £15. Calculate the break-even output. If the firm produces and sells 300 candles in a month, determine whether it makes a profit or loss and state the amount.
问题：一家初创企业生产手工蜡烛。每月固定成本为 2,500 英镑。每支蜡烛的材料与人工可变成本为 5 英镑，售价为 15 英镑。计算盈亏平衡产量。若该企业月产销量为 300 支，判断其盈利或亏损，并计算具体金额。
explanation: Break-even output = Fixed costs / (Selling price − Variable cost per unit) = £2,500 / (£15 − £5) = £2,500 / £10 = 250 candles. At 300 candles, total revenue = 300 × £15 = £4,500. Total cost = Fixed cost + (Variable cost per unit × quantity) = £2,500 + (300 × £5) = £2,500 + £1,500 = £4,000. Profit = Total revenue − Total cost = £4,500 − £4,000 = £500. Therefore the firm earns a profit of £500 at 300 units, which is above break-even.
答案与解析：盈亏平衡产量 = 固定成本 / (售价 − 单位可变成本) = 2,500 / (15 − 5) = 2,500 / 10 = 250 支。当产量为 300 支时，总收益 = 300 × 15 = 4,500 英镑。总成本 = 固定成本 + (单位可变成本 × 数量) = 2,500 + (300 × 5) = 2,500 + 1,500 = 4,000 英镑。利润 = 4,500 − 4,000 = 500 英镑。因此，该企业在 300 支时盈利 500 英镑，超过了盈亏平衡点。
4. Market Failure – Negative Externalities | 市场失灵——负外部性
Question: Explain how the production of chemicals can create negative externalities in production. Illustrate why the free market outcome leads to overproduction relative to the social optimum, and suggest one government policy to correct this market failure.
问题：解释化工生产如何产生生产的负外部性。说明为何自由市场结果相对于社会最优会导致过度生产，并提出一项纠正该市场失灵的政府政策。
vate cost (MPC) curve lies to the right of the marginal social cost (MSC) curve. The market equilibrium occurs where demand (MPB = MSB) equals MPC, giving output Qm. The socially efficient output Qs is lower, where demand equals MSC. Because the firm ignores the external costs, Qm > Qs, resulting in overproduction and a deadweight welfare loss. To address this, the government can impose an indirect tax equal to the marginal external cost at Qs, shifting the MPC curve upwards to align with MSC. This internalises the externality and moves production towards the socially optimum level.
答案与解析：化工生产常将污染物排放到河流或空气中，对环境、野生动植物和人类健康造成损害。这些外部成本不由企业承担，因此私人生产成本低于真实的社会成本。在图形中，边际私人成本 (MPC) 曲线位于边际社会成本 (MSC) 曲线的右侧。市场均衡点在需求 (MPB = MSB) 等于 MPC 处，产量为 Qm。社会有效产量 Qs 更低，位于需求等于 MSC 处。由于企业忽视外部成本，Qm 大于 Qs，导致过度生产和无谓福利损失。为纠正这一问题，政府可征收相当于 Qs 处边际外部成本的间接税，使 MPC 曲线上移与 MSC 对齐，从而内部化外部性，使产量趋向社会最优水平。
5. Government Intervention – Indirect Tax | 政府干预——间接税
Question: A government imposes a specific tax on each litre of petrol sold. Using a supply and demand diagram, analyse how the tax affects the market price paid by consumers, the price received by producers, and the equilibrium quantity. Evaluate the effectiveness of this tax in reducing petrol consumption.
问题：政府对每升售出的汽油征收从量税。运用供求图分析该税收如何影响消费者支付的市场价格、生产者收到的价格以及均衡数量。评估该税收在减少汽油消费方面的有效性。
Answer and explanation: A specific tax shifts the supply curve vertically upwards by the amount of the tax. The new equilibrium price paid by consumers (Pc) is higher than the original price (Pe), and the price received by producers (Pp) is lower by the tax amount, once the market settles. Equilibrium quantity falls from Qe to Qt. The effectiveness depends heavily on the price elasticity of demand. Since petrol tends to have a low price elasticity
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