IB CCEA Economics Unit Test Paper | IB CCEA 经济单元测试卷

📚 IB CCEA Economics Unit Test Paper | IB CCEA 经济单元测试卷

This practice unit test paper is designed for Economics students following the IB Diploma Programme or CCEA A-Level specifications. It covers core microeconomic and macroeconomic concepts, including demand and supply, elasticity, government intervention, market failure, and macroeconomic objectives. The paper mimics the style of typical unit assessments, helping you consolidate knowledge and prepare for internal school tests or mock examinations. Use this resource to self-assess your understanding and identify areas for further revision.

本单元练习测试卷专为学习IB文凭课程或CCEA A-Level经济学课程的学生设计。试卷涵盖微观与宏观经济学的核心概念，包括需求与供给、弹性、政府干预、市场失灵以及宏观经济目标。试卷模拟了典型单元测验的风格，帮助你巩固知识，为校内测试或模拟考试做好准备。利用这份资源进行自我评估，发现需要进一步复习的薄弱环节。

1. Examination Instructions | 考试须知

This paper consists of four sections: Section A (Multiple Choice Questions), Section B (Short‑Answer Questions), Section C (Data Response Question), and Section D (Essay Question). Answer all questions. The total time allowed is 90 minutes. The maximum mark is 60. Marks for each question are shown in square brackets.

本试卷包含四个部分：第一部分（选择题）、第二部分（简答题）、第三部分（数据分析题）和第四部分（论述题）。所有题目均需作答。考试时间为90分钟。满分为60分。每题分数标注在方括号内。

Read each question carefully before you start writing. Where calculations are required, show all your working. In essay responses, use economic terminology accurately and support your arguments with relevant diagrams where appropriate.

开始答题前，请仔细阅读每个问题。涉及计算时，请展示全部解题步骤。在论述题中，请准确使用经济学术语，并适当借助相关图表支持你的论点。

You may use a non‑programmable calculator. Start each section on a new page in your answer booklet.

你可以使用非编程计算器。每部分需从答题本新的一页开始作答。

2. Section A: Multiple Choice Questions (5 × 2 marks) | 第一部分：选择题（5 × 2分）

Select the most appropriate answer for each question.

请为每道题选择最合适的答案。

1. The law of demand states that, ceteris paribus, as the price of a good rises:

1. 需求定律指出，在其他条件不变的情况下，当一种商品的价格上升时：

A. quantity demanded increases	A. 需求量增加
B. quantity demanded decreases	B. 需求量减少
C. demand shifts to the right	C. 需求曲线向右移动
D. demand becomes more elastic	D. 需求变得更有弹性

2. A government imposes a specific tax on a good with perfectly inelastic demand. The burden of the tax will fall:

2. 政府对一种需求完全无弹性的商品征收从量税。税收负担将落在：

A. entirely on producers	A. 完全由生产者承担
B. equally on consumers and producers	B. 消费者和生产者平均分担
C. entirely on consumers	C. 完全由消费者承担
D. mainly on the government	D. 主要由政府承担

3. Which of the following is most likely to cause a rightward shift of the supply curve for organic vegetables?

3. 以下哪一项最有可能导致有机蔬菜的供给曲线向右移动？

A. An increase in consumer incomes	A. 消费者收入增加
B. A subsidy paid to organic farmers	B. 向有机农户支付补贴
C. A health report promoting the benefits of organic food	C. 一份宣传有机食品益处的健康报告
D. An increase in the price of chemical fertilisers	D. 化肥价格上涨

4. The table below shows the national income data for a hypothetical economy. What is the value of GDP at market prices?

4. 下表为一个假想经济的国民收入数据。按市场价格计算的GDP是多少？

Item	项目	$ billion
Consumption	消费	520
Investment	投资	180
Government spending	政府支出	210
Exports	出口	150
Imports	进口	130

A. $930 bn	A. 9300亿美元
B. $1,060 bn	B. 10600亿美元
C. $1,190 bn	C. 11900亿美元
D. $920 bn	D. 9200亿美元

5. A negative externality in production arises when:

5. 生产的负外部性产生于：

A. social costs are less than private costs	A. 社会成本小于私人成本
B. social costs exceed private costs	B. 社会成本大于私人成本
C. private costs exceed social costs	C. 私人成本大于社会成本
D. social benefits exceed private benefits	D. 社会收益大于私人收益

3. Section B: Short‑Answer Questions (3 × 4 marks) | 第二部分：简答题（3 × 4分）

1. Define ‘price elasticity of demand’ (PED) and write the formula. Explain what a PED value of 0.8 indicates about the responsiveness of quantity demanded to a price change. [4]

1. 定义“需求价格弹性”（PED）并写出公式。解释PED值为0.8时表明需求量对价格变动的反应程度如何。[4分]

2. Distinguish between a ‘public good’ and a ‘private good’. Use the characteristics of non‑rivalry and non‑excludability to support your answer. [4]

2. 区分“公共物品”与“私人物品”。运用非竞争性和非排他性特征来支持你的答案。[4分]

3. With the help of a diagram, explain how a maximum price (price ceiling) set below the equilibrium price can lead to a market disequilibrium. [4]

3. 借助图表，解释设定在均衡价格以下的最高限价（价格上限）如何导致市场失衡。[4分]

4. Section C: Data Response Question (18 marks) | 第三部分：数据分析题（18分）

Study the following information and answer the questions that follow.

阅读以下信息，并回答后续问题。

The market for locally roasted coffee beans in a small city is represented by the demand and supply schedules below.

一个小城市本地烘焙咖啡豆的市场由以下需求与供给表表示。

Price per kg ($)	Quantity demanded (kg per week)	Quantity supplied (kg per week)
10	800	200
15	600	400
20	450	450
25	300	550
30	180	600

(a) Identify the equilibrium price and equilibrium quantity. [2]

(a) 确定均衡价格和均衡数量。[2分]

(b) Calculate the price elasticity of demand (PED) when the price increases from $15 to $20. Show your working and interpret the result. [6]

(b) 计算当价格从15美元上涨到20美元时的需求价格弹性（PED）。展示计算过程并解释结果。[6分]

(c) Suppose the government introduces a per‑unit subsidy of $5 to coffee producers. Using the data, explain how this subsidy is likely to affect the equilibrium price and quantity. Illustrate your answer with a diagram. [10]

5. Section D: Essay Question (25 marks) | 第四部分：论述题（25分）

‘Indirect taxes are the most effective policy to correct market failure arising from negative externalities in consumption.’ To what extent do you agree with this statement? Justify your answer with reference to real‑world examples and alternative policy measures. [25]

“间接税是纠正消费负外部性所导致的市场失灵最有效的政策。”你在多大程度上同意这一说法？请结合现实案例和其他政策措施来论证你的观点。[25分]

6. Answer Key: Multiple Choice | 参考答案：选择题

1. Answer: B. Quantity demanded decreases. The law of demand states an inverse relationship between price and quantity demanded – higher price leads to a contraction along the demand curve, not a shift.

1. 答案：B。需求量减少。需求定律表明价格与需求量呈反向关系——更高的价格导致沿需求曲线收缩，而非曲线移动。

2. Answer: C. Entirely on consumers. When demand is perfectly inelastic, consumers are unable to change quantity demanded in response to price changes, so they bear the full tax burden.

2. 答案：C。完全由消费者承担。当需求完全无弹性时，消费者无法因价格变化而调整需求量，因此承担全部税收负担。

3. Answer: B. A subsidy paid to organic farmers. Subsidies lower production costs, increasing willingness and ability to supply at each price, shifting the supply curve to the right. Other options affect demand or increase costs.

3. 答案：B。向有机农户支付补贴。补贴降低生产成本，提高了在每个价格下的供给意愿和能力，使供给曲线右移。其他选项影响需求或增加成本。

4. Answer: A. $930 bn. Using the expenditure method:
GDP = C + I + G + (X − M) = 520 + 180 + 210 + (150 − 130) = 930.

4. 答案：A。9300亿美元。使用支出法：GDP = C + I + G + (X − M) = 520 + 180 + 210 + (150 − 130) = 930。

5. Answer: B. Social costs exceed private costs. A negative externality in production occurs when the social cost (private cost plus external cost) is greater than the private cost alone, leading to overproduction.

5. 答案：B。社会成本大于私人成本。生产的负外部性发生在社会成本（私人成本加外部成本）高于私人成本时，导致过度生产。

7. Short‑Answer Solutions | 简答题答案

1. PED measures the responsiveness of quantity demanded to a change in price.

1. 需求价格弹性（PED）衡量需求量对价格变化的反应程度。

PED = % change in quantity demanded / % change in price

PED = 需求量变化的百分比 / 价格变化的百分比

A PED of 0.8 means demand is inelastic: a 1% rise in price leads to a 0.8% fall in quantity demanded. Total revenue would increase if price rises.

PED为0.8意味着需求缺乏弹性：价格每上升1%，需求量下降0.8%。若涨价，总收益将增加。

2. A private good is both rivalrous and excludable (e.g. a cup of coffee). A public good is non‑rivalrous (consumption by one person does not reduce availability for others) and non‑excludable (it is impossible to prevent non‑payers from consuming it), such as street lighting. These characteristics lead to the free‑rider problem, meaning public goods would be under‑provided in a free market.

2. 私人物品具有竞争性和排他性（如一杯咖啡）。公共物品具有非竞争性（一人消费不会减少他人可用量）和非排他性（无法阻止未付费者消费），例如路灯。这些特征导致搭便车问题，意味着公共物品在自由市场中供给不足。

3. A price ceiling set below equilibrium (P_max < P_e) creates excess demand (a shortage). At the lower price, quantity demanded rises while quantity supplied falls, producing a persistent gap. This can lead to black markets and rationing. Diagram should show the horizontal ceiling line below equilibrium, with Qd > Qs highlighted.

3. 限制在均衡价格以下的最高限价（P_max < P_e）会造成超额需求（短缺）。在更低的价格下，需求量增加，供给量减少，形成持续缺口。这可能导致黑市和配给制。图表应展示低于均衡点的水平限价线，并标出Qd > Qs。

8. Data Response Solutions | 数据分析题答案

(a) Equilibrium occurs where quantity demanded equals quantity supplied: price = $20, quantity = 450 kg per week.

(a) 均衡出现在需求量等于供给量时：价格 = 20美元，数量 = 每周450公斤。

(b) Using the midpoint (arc) method for PED:
%ΔQd = [(450 − 600) / ((600+450)/2)] × 100 = (−150/525) × 100 ≈ −28.57%
%ΔP = [(20 − 15) / ((15+20)/2)] × 100 = (5/17.5) × 100 ≈ 28.57%

(b) 使用中点（弧）法计算PED：
需求量变化百分比 = [(450 − 600) / ((600+450)/2)] × 100 = (−150/525) × 100 ≈ −28.57%
价格变化百分比 = [(20 − 15) / ((15+20)/2)] × 100 = (5/17.5) × 100 ≈ 28.57%

PED = | −28.57% / 28.57% | = 1.0 (unitary elastic)

Interpretation: Demand is unit elastic over this price range — the percentage change in quantity demanded equals the percentage change in price. Total revenue remains unchanged.

解释：在这一价格区间内需求具有单位弹性——需求量变化的百分比等于价格变化的百分比。总收益保持不变。

(c) A $5 per‑unit subsidy reduces producers’ costs, effectively shifting the supply curve vertically downward by $5. At each quantity, the price at which producers are willing to supply is lower. This creates a new equilibrium with a lower market price and a higher equilibrium quantity. For example, whereas before producers supplied 450 kg at $20, after the subsidy they would be willing to supply that quantity at a price of $15 (keeping the same net revenue). The new equilibrium can be estimated by adding $5 to the supply price for each quantity. The market price paid by consumers falls (though by less than $5 if demand is not perfectly elastic), and quantity traded increases. Diagram should show a rightward shift of the supply curve, with the new equilibrium price lower and quantity higher.

(c) 每单位5美元的补贴降低了生产者的成本，实际上使供给曲线垂直向下平移5美元。在每个数量下，生产者愿意供货的价格更低。这产生了一个新的均衡点，市场价格更低，均衡数量更高。例如，此前生产者在20美元时供应450公斤，补贴后他们愿意以15美元的价格供应这一数量（保持相同的净收入）。新的均衡可以通过在每个数量上加上5美元至供给价格来估算。消费者支付的市场价格下降（如果需求并非完全弹性，降幅小于5美元），交易数量增加。图表应显示供给曲线向右移动，新的均衡价格更低、数量更高。

9. Essay Marking Guidance | 论述题评分指导

This essay requires critical evaluation. High‑scoring responses should: define indirect taxes and illustrate how they internalise the externality (e.g. tax on sugary drinks, tobacco). Discuss the effectiveness using the concepts of elasticity, information gaps, and the extent of the externality. Examine limitations: regressive nature, black markets, administrative costs. Compare at least two alternative policies such as regulation (banning advertising), tradable permits, or minimum prices. A balanced conclusion should state the conditions under which indirect taxes are effective and when other measures might be preferable. Clear diagrams (e.g. negative consumption externality graph with tax shifting MPC to MSC) are expected.

本题要求进行批判性评价。高分答案应：定义间接税并阐述其如何内化外部性（如含糖饮料税、烟草税）。运用弹性、信息缺口以及外部性的程度等概念讨论其有效性。审视局限性：累退性、黑市、管理成本。比较至少两种替代政策，如管制（禁止广告）、可交易许可证或最低价格。均衡的结论应阐明间接税在何种条件下有效，以及在何种情况下其他措施可能更优。期望有清晰的图表（例如消费负外部性图形，税款使MPC移向MSC）。

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IB CCEA Economics Unit Test Paper | IB CCEA 经济单元测试卷