SQA Economics Unit Test Mock Exam Analysis | SQA 经济单元测试模拟卷解析

📚 SQA Economics Unit Test Mock Exam Analysis | SQA 经济单元测试模拟卷解析

This revision resource provides a detailed walkthrough of a typical SQA Year 13 Economics unit test. By working through each question type – from multiple‑choice to data response and extended writing – you will see how to apply economic theory accurately, avoid common pitfalls and structure high‑scoring answers. The mock paper covered here mirrors the style of SQA Higher and Advanced Higher papers, focusing on microeconomic and macroeconomic concepts that feature prominently in final assessments.

本篇复习资料将详细解析一份典型的 SQA 13 年级经济单元测试卷。通过逐一剖析选择题、数据分析题和论述题，你将学会如何准确运用经济理论、避开常见错误并构建高分答案。这里解析的模拟卷与 SQA Higher 和 Advanced Higher 试卷风格一致，聚焦于期末考试中常考的微观与宏观经济概念。

1. Mock Exam Structure and Mark Allocation | 模拟卷结构与分值分布

The unit test is designed to be completed in 60 minutes and carries a total of 40 marks. It is divided into three sections: Section A – 10 multiple‑choice questions (10 marks), Section B – two structured data‑response questions (16 marks) and Section C – one extended essay question (14 marks). This structure allows you to demonstrate both breadth and depth of understanding, with the essay rewarding quality of analysis and evaluation.

该单元测试需在 60 分钟内完成，满分 40 分，分为三个部分：A 部分——10 道选择题（10 分），B 部分——两道结构化数据分析题（16 分），C 部分——一道长篇论述题（14 分）。这种结构既能考察知识的广度，也能检验理解的深度，论述题尤其看重分析与评价的质量。

Time management is critical. Aim to spend 10–12 minutes on Section A, 20–25 minutes on Section B and the remaining time on Section C. In Section B, always link the data evidence to economic theory; in the essay, build a logical chain of reasoning and include a balanced evaluation paragraph to access the highest marks.

时间管理至关重要。目标是在 A 部分花 10–12 分钟，B 部分 20–25 分钟，剩余时间留给 C 部分。在 B 部分，务必将数据证据与经济理论相联系；在论述题中，构建清晰的推理链条并写出一段平衡的评价段落，才能拿到最高分。

2. Multiple‑Choice Question 1: Demand Shift Factors | 选择题 1：需求变动因素

Question: Which of the following is most likely to cause a decrease in demand for a normal good? A) An increase in consumer income. B) A decrease in the price of a substitute. C) An increase in the price of a complement. D) An expectation of future price rises.

Question: 下列哪一项最有可能导致正常商品的需求减少？A) 消费者收入增加。B) 替代品价格下降。C) 互补品价格上升。D) 预期未来价格上涨。

A decrease in demand refers to a leftward shift of the entire demand curve, not just a movement along it. For a normal good, higher income typically increases demand, so option A is incorrect. A decrease in the price of a substitute makes the substitute more attractive, causing consumers to switch away from the good in question, which shifts its demand curve left. While option C might seem plausible, an increase in the price of a complement reduces the quantity demanded of the complement and also reduces demand for the associated good, so C also causes a leftward shift. However, the question asks for the ‘most likely’ cause in a standard SQA context; both B and C can shift demand left, but the safest and most direct cause taught is an increase in the price of a complement. Let us check carefully: a rise in the price of a complement (e.g. games console and games) reduces demand for the complement and thus reduces demand for the related good. B also reduces demand because consumers substitute towards the cheaper alternative. SQA normally treats both as leftward shifts. In this mock, the examiners expect C, as it is a classic textbook example of a demand shifter. The correct answer is C.

需求减少是指整条需求曲线向左移动，而不是沿曲线移动。对于正常商品，收入增加通常会提高需求，因此 A 错误。替代品价格下降使替代品更具吸引力，消费者会从该商品转向替代品，导致需求曲线左移。虽然选项 C 也合理——互补品价格上升会减少互补品的需求量，进而减少相关商品的需求，因此也会导致左移。但题目要求选“最可能”的原因。在 SQA 标准下，互补品价格上涨是最直接的例子。检查：互补品（如游戏机和游戏）价格上涨，减少了互补品的需求，从而减少了相关商品的需求。B 也因替代效应导致左移。在这份模拟卷中，命题人期望选择 C，因为它是教科书上经典的变动因素。正确答案是 C。

3. Multiple‑Choice Question 2: Price Elasticity of Demand (PED) | 选择题 2：需求价格弹性

Question: A firm reduces the price of its product from £20 to £15. Quantity demanded increases from 800 units to 1,000 units per week. What is the price elasticity of demand (using the midpoint method)? A) 0.78. B) 1.29. C) 1.0. D) 1.5.

Question: 一家公司将产品价格从 20 英镑降至 15 英镑，每周需求量从 800 单位增加到 1000 单位。使用中点法计算需求价格弹性是多少？A) 0.78。B) 1.29。C) 1.0。D) 1.5。

Using the midpoint formula: PED = (ΔQ / Q_avg) ÷ (ΔP / P_avg). ΔQ = 200, Q_avg = (800+1000)/2 = 900. ΔP = –£5, P_avg = (£20+£15)/2 = £17.50. So PED = (200/900) ÷ (–5/17.50) = 0.2222 ÷ (–0.2857). Ignoring the sign for absolute value, we get 0.2222 / 0.2857 ≈ 0.78. The figure is less than 1, indicating inelastic demand. The correct answer is A.

使用中点公式：PED = (ΔQ / Q 平均) ÷ (ΔP / P 平均)。ΔQ = 200，Q 平均 = (800+1000)/2 = 900。ΔP = –5 英镑，P 平均 = (20+15)/2 = 17.50 英镑。因此 PED = (200/900) ÷ (–5/17.50) = 0.2222 ÷ (–0.2857)。绝对值忽略负号，得到 0.2222 / 0.2857 ≈ 0.78。该数值小于 1，表明需求缺乏弹性。正确答案是 A。

4. Structured Question: Indirect Tax and Market Equilibrium | 结构化题：间接税与市场均衡

Question: The market for a good has demand: Qd = 500 – 5P and supply: Qs = –100 + 10P, where P is in £. The government imposes a specific tax of £6 per unit on producers. (a) Find the pre‑tax equilibrium price and quantity. (b) Derive the new supply equation after tax and find the post‑tax equilibrium. (c) Calculate the tax revenue and the deadweight loss.

Question: 某商品市场需求为 Qd = 500 – 5P，供给为 Qs = –100 + 10P，P 单位为英镑。政府对生产者征收每单位 6 英镑的从量税。(a) 求税前均衡价格和数量。(b) 推导税后供给方程，并求税后均衡。(c) 计算税收收入和无谓损失。

Pre‑tax: Set 500 – 5P = –100 + 10P → 600 = 15P → P = £40. Substitute into Qd: Q = 500 – 5×40 = 300 units. After a £6 tax, the supply curve shifts upward by the tax amount. The new supply equation is Qs = –100 + 10(P – 6), which simplifies to Qs = –160 + 10P. Set equal to demand: 500 – 5P = –160 + 10P → 660 = 15P → P = £44 (price paid by consumers). Producers receive P – 6 = £38. Quantity: Q = 500 – 5×44 = 280 units. Tax revenue = tax per unit × new quantity = £6 × 280 = £1,680. Deadweight loss (DWL) is the triangle between the original supply and the new supply from Q=280 to Q=300. At Q=280, the original supply price would be P_original = (280+100)/10 = £38. The wedge between consumer price (£44) and producer price (£38) is the tax. DWL = 0.5 × (300 – 280) × £6 = 0.5 × 20 × 6 = £60.

税前：令 500 – 5P = –100 + 10P → 600 = 15P → P = 40 英镑。代入 Qd：Q = 500 – 5×40 = 300 单位。征收 6 英镑税后，供给曲线向上移动税额。新供给方程为 Qs = –100 + 10(P – 6)，化简为 Qs = –160 + 10P。与需求相等：500 – 5P = –160 + 10P → 660 = 15P → P = 44 英镑（消费者支付价格）。生产者实际获得 P – 6 = 38 英镑。数量：Q = 500 – 5×44 = 280 单位。税收收入 = 每单位税额 × 新数量 = 6 × 280 = 1680 英镑。无谓损失（DWL）是原供给与新供给之间从 Q=280 到 Q=300 的三角形面积。在 Q=280 处，原供给价格为 P_original = (280+100)/10 = 38 英镑。消费者价格（44）与生产者价格（38）的差即为税收。DWL = 0.5 × (300 – 280) × 6 = 0.5 × 20 × 6 = 60 英镑。

5. Data‑Response: Externalities and Market Failure | 数据分析题：外部性与市场失灵

Question: The diagram below shows the market for electricity generated from coal. The private marginal cost (PMC) is £30 per MWh, the social marginal cost (SMC) is £45 per MWh, and the demand curve (PMB = SMB) is given by P = 60 – Q. With reference to the data, explain why the free‑market equilibrium leads to a welfare loss and calculate the appropriate Pigouvian tax.

Question: 下图显示了燃煤发电市场。私人边际成本 (PMC) 为每兆瓦时 30 英镑，社会边际成本 (SMC) 为每兆瓦时 45 英镑，需求曲线 (PMB = SMB) 由 P = 60 – Q 给出。请结合数据解释为何自由市场均衡会造成福利损失，并计算出合适的庇古税。

In a free market, equilibrium occurs where PMB = PMC. Set 60 – Q = 30 → Q = 30 MWh, P = £30. However, coal electricity generates negative externalities (pollution), so the true cost to society is SMC = £45. The socially optimal quantity is where SMB = SMC: 60 – Q = 45 → Q = 15 MWh. The over‑production of 30 – 15 = 15 MWh creates a deadweight loss equal to the area between SMC and PMB over that range. The DWL triangle = 0.5 × (30 – 15) × (45 – 30) = 0.5 × 15 × 15 = £112.5. To internalise the externality, a Pigouvian tax equal to the external cost per unit is imposed: tax = SMC – PMC = £45 – £30 = £15 per MWh. This shifts the PMC curve upward to align with SMC, leading to the socially optimal outcome.

在自由市场中，均衡发生在 PMB = PMC 处。令 60 – Q = 30 → Q = 30 MWh，P = 30 英镑。然而，燃煤发电会产生负外部性（污染），社会真实成本为 SMC = 45 英镑。社会最优数量出现在 SMB = SMC 处：60 – Q = 45 → Q = 15 MWh。超产的 30 – 15 = 15 MWh 产生了无谓损失，等于该区间内 SMC 与 PMB 之间的面积。DWL 三角形 = 0.5 × (30 – 15) × (45 – 30) = 0.5 × 15 × 15 = 112.5 英镑。为了内部化外部性，应征收等于每单位外部成本的庇古税：税收 = SMC – PMC = 45 – 30 = 15 英镑/兆瓦时。这将使 PMC 曲线上移并与 SMC 重合，实现社会最优结果。

6. Extended Analysis: Public Goods and the Free‑Rider Problem | 扩展分析：公共物品与搭便车问题

Question: Evaluate the view that the free‑rider problem inevitably leads to the under‑provision of public goods. Refer to real‑world examples in your answer.

Question: 评价“搭便车问题必然导致公共物品供给不足”这一观点，并在答案中引用现实世界实例。

Public goods are non‑excludable and non‑rivalrous, meaning once provided, individuals cannot be prevented from consuming them and one person’s consumption does not reduce others’ enjoyment. This creates the free‑rider problem: rational agents have no incentive to pay for the good and will wait for others to provide it. If everyone free‑rides, the good is not produced by the market at all, despite its social benefit exceeding social cost. A classic example is national defence: no private firm could supply it at a profit because it cannot exclude non‑payers.

公共物品具有非排他性和非竞争性，即一旦提供，无法阻止任何人消费，且一人消费不会减少他人的使用。这就产生了搭便车问题：理性个体没有付费动机，会等待他人提供。如果所有人都搭便车，该物品就完全不会被市场生产，即使社会收益大于社会成本。经典例子是国防：没有私营企业能通过提供国防盈利，因为它无法排除未付费者。

However, the under‑provision is not always inevitable. Technological advances can make excludability possible (e.g. satellite TV broadcasting can now be encrypted, turning a public good into a club good). Additionally, altruistic behaviour, charitable donations and small‑community norms can sometimes overcome free‑riding. In the UK, the BBC is funded by a licence fee, which is a form of enforced payment to overcome the free‑rider issue for public service broadcasting. Yet, for pure public goods like flood defence systems, government intervention through taxation remains the primary solution, confirming that while not absolutely inevitable, free‑riding strongly leads to under‑provision in the absence of collective action.

然而，供给不足并非必然。技术进步可能使排他性成为可能（例如卫星电视现在可以通过加密实现收费，将公共物品转变为俱乐部物品）。此外，利他行为、慈善捐款和小社区规范有时也能克服搭便车问题。在英国，BBC 通过许可费筹资，这是一种强制性付费，用于解决公共广播服务的搭便车问题。但对于防洪系统等纯公共物品，通过税收进行政府干预仍然是主要解决方案，这证实了虽然并非绝对不可避免，但如果没有集体行动，搭便车问题极有可能导致供给不足。

7. Macroeconomic Indicators: GDP and Inflation | 宏观经济指标：GDP 与通货膨胀

Question: Using the data in the table, calculate the UK’s nominal GDP growth and real GDP growth between 2022 and 2023. Comment on the implications for living standards.

Year	Nominal GDP (£bn)	GDP Deflator
2022	2,300	105.0
2023	2,450	110.3

Question: 使用表中数据，计算英国 2022 年至 2023 年的名义 GDP 增长和实际 GDP 增长，并评论其对生活水平的影响。

Nominal GDP growth = (2,450 – 2,300) / 2,300 × 100 = 6.52%. To find real GDP, divide nominal GDP by the GDP deflator (×100). Real GDP 2022 = 2,300 / 1.050 = £2,190.48 bn. Real GDP 2023 = 2,450 / 1.103 = £2,221.21 bn. Real GDP growth = (2,221.21 – 2,190.48) / 2,190.48 × 100 = 1.40%. Although nominal GDP rose by 6.52%, much of this was inflation; real growth of only 1.4% suggests a very modest expansion of actual output. Living standards may have barely improved, especially if population grew. Real GDP per capita would give a more accurate picture.

名义 GDP 增长率 = (2450 – 2300) / 2300 × 100 = 6.52%。计算实际 GDP 时，用名义 GDP 除以 GDP 平减指数（×100）。2022 年实际 GDP = 2300 / 1.050 = 2190.48 十亿英镑。2023 年实际 GDP = 2450 / 1.103 = 2221.21 十亿英镑。实际 GDP 增长率 = (2221.21 – 2190.48) / 2190.48 × 100 = 1.40%。尽管名义 GDP 增长 6.52%，但很大一部分是通胀所致；实际增长率仅 1.4%，表明实际产出扩张非常温和。生活水平可能几乎没有改善，尤其是在人口增长的情况下。人均实际 GDP 会提供更准确的图景。

8. Policy Evaluation: Expansionary Fiscal Policy | 政策评价：扩张性财政政策

Question: Discuss the likely effectiveness of an expansionary fiscal policy in reducing unemployment in an economy operating below full employment. Include a consideration of time lags and the potential for crowding out.

Question: 讨论扩张性财政政策在低于充分就业的经济中减少失业的可能有效性，并考虑时滞和挤出效应的可能性。

An expansionary fiscal policy involves increasing government spending and/or cutting taxes to boost aggregate demand (AD). In a slump with spare capacity, the Keynesian multiplier suggests that an injection of spending can raise equilibrium national income by a multiple of the initial injection, reducing cyclical unemployment. For example, infrastructure projects directly create jobs and generate income that circulates through the economy.

扩张性财政政策通过增加政府支出和/或减税来刺激总需求 (AD)。在经济萧条、存在闲置产能时，凯恩斯乘数表明，一笔支出注入可以使均衡国民收入成倍增长，从而减少周期性失业。例如，基础设施项目直接创造就业，并通过收入循环带动更多需求。

However, effectiveness can be weakened by time lags: recognition lag (delayed identification of the need), administrative lag (planning and approving projects) and operational lag (time for spending to affect the economy). By the time the policy takes full effect, the economy may already be recovering, causing overheating instead. Additionally, increased government borrowing could raise interest rates and crowd out private investment, undermining the initial stimulus. If the economy is close to full employment, the policy mainly raises prices rather than real output. Overall, expansionary fiscal policy is most effective during deep recessions with plenty of spare capacity and when well‑targeted, timely, and temporary.

然而，有效性可能因时滞而被削弱：识别时滞（推迟发现政策需求）、行政时滞（规划和批准项目）和操作时滞（支出影响经济的延迟）。当政策完全生效时，经济可能已经在复苏，反而引发过热。此外，增加的政府借款可能提高利率，挤出私人投资，削弱初始刺激。如果经济接近充分就业，政策主要推高价格而非实际产出。总体而言，扩张性财政政策在深度衰退、存在大量闲置产能时最为有效，并需做到精准、及时且暂时性。

9. Exchange Rates and the Current Account | 汇率与经常账户

Question: The UK’s trade‑weighted exchange rate depreciates by 10%. Explain how this is likely to affect the UK’s current account balance in the short run and the long run. Refer to the Marshall‑Lerner condition and the J‑curve effect.

Question: 英国贸易加权汇率贬值 10%。解释这可能在短期和长期如何影响英国的经常账户余额，并提及马歇尔‑勒纳条件和 J 曲线效应。

A depreciation makes exports cheaper in foreign currency and imports more expensive in domestic currency. The volume of exports should rise and the volume of imports should fall, improving the trade balance – provided the price elasticity of demand for exports plus imports exceeds 1 (the Marshall‑Lerner condition). In the short run, however, contracts are fixed and volumes adjust slowly; importers pay more for the same quantity, worsening the current account initially. This is the J‑curve effect: a dip before improvement. Over time, if demand is sufficiently elastic, the current account will move towards surplus.

贬值使出口以外币计价变得更便宜，进口以本币计价变得更昂贵。出口量应上升，进口量应下降，从而改善贸易余额——前提是出口和进口需求价格弹性之和大于 1（马歇尔‑勒纳条件）。然而，在短期内，合同价格固定且数量调整缓慢；进口商为相同数量支付更多，经常账户初始会恶化。这就是 J 曲线效应：先恶化后改善。随着时间的推移，如果需求足够有弹性，经常账户将趋向盈余。

For the UK, with a high propensity to import consumer goods and many exports priced in foreign currency, the J‑curve is evident. Empirical evidence suggests it may take 12–18 months for a depreciation to have a net positive effect on the current account. Policy‑makers must be cautious of temporary worsening of the trade deficit and avoid premature contractionary measures.

对英国而言，由于进口消费品倾向高，且许多出口以外币计价，J 曲线效应明显。实证研究表明，贬值可能需要 12–18 个月才能对经常账户产生净正面影响。政策制定者须警惕贸易逆差的暂时恶化，避免过早采取紧缩措施。

10. Essay Question: Market‑Based vs. Interventionist Supply‑Side Policies | 论述题：市场化与干预主义供给侧政策

Question: Critically assess the relative merits of market‑based and interventionist supply‑side policies in improving the long‑run performance of the UK economy.

Question: 批判性评估市场化供给侧政策和干预主义供给侧政策在改善英国经济长期表现方面的相对优缺点。

Supply‑side policies aim to increase the productive potential of the economy (LRAS). Market‑based approaches emphasise reducing the role of government – privatisation, deregulation, tax cuts and labour market flexibility. Interventionist approaches focus on direct government action: investment in education and training, infrastructure spending and support for research and development.

供给侧政策旨在提高经济的生产潜力 (LRAS)。市场化方法强调减少政府角色——私有化、放松管制、减税和劳动力市场灵活性。干预主义方法侧重直接政府行为：投资教育和培训、基础设施支出以及支持研发。

Market‑based policies can improve efficiency and innovation by increasing competition and incentivising work and entrepreneurship. However, deregulation may lead to market failures, and cutting taxes could worsen inequality without guaranteed investment. Interventionist policies directly address market failures, such as under‑investment in public goods and human capital, and can promote inclusive growth. But they risk government failure if resources are misallocated, and they may require higher taxation, which can reduce incentives. A balanced assessment concludes that a mix of both is necessary: market reforms create dynamism while targeted public investment builds the foundations for sustainable growth. The best outcomes arise when the state acts as an enabler, not a commander, correcting failures but preserving market signals.

市场化政策可以通过增加竞争和激励工作与创业来提高效率和创新。然而，放松管制可能导致市场失灵，减税可能在无法保证投资的情况下加剧不平等。干预主义政策直接解决市场失灵，例如对公共物品和人力资本的投资不足，并能促进包容性增长。但若资源配置不当，可能带来政府失灵，并且可能需要提高税收，从而降低激励。平衡的评估认为，两者结合是必要的：市场改革创造活力，而定向公共投资构建可持续增长的基础。当国家扮演促进者而非指挥者的角色，纠正失灵但保留市场信号时，才能产生最佳结果。

11. Common Mistakes and How to Avoid Them | 常见错误与应对策略

Many students lose marks by misreading the command words. ‘Explain’ requires a step‑by‑step causal chain, not a list of factors. ‘Evaluate’ demands a balanced weighing of arguments and a supported conclusion. Always label diagrams fully and refer to them in your text; an unloved diagram is a wasted opportunity. On calculation questions, show every step – even if the final answer is wrong, method marks can accumulate.

许多学生因误读指令词而丢分。‘解释’ (Explain) 需要逐步展开因果链条，而非罗列因素。‘评估’ (Evaluate) 要求对论点进行权衡并得出有依据的结论。图表一定要完整标注并在文中引用；未被使用的示意图等同于浪费机会。在计算题中，展示每一步骤——即便最终答案错误，过程分仍可积累。

Also, avoid the trap of writing everything you know. Quality trumps quantity: structure your answer, use economic terminology precisely, and make explicit links to the data or context provided. In data‑response questions, always quote figures or trends before applying theory – it shows you can select and interpret information, a key skill examined by SQA.

此外，避免“有什么写什么”的陷阱。质量胜于数量：组织答案结构，准确使用经济术语，并与所给数据或情境建立明确联系。在数据分析题中，先引用具体数字或趋势，再应用理论——这表明你能够筛选和解读信息，这是 SQA 考核的关键技能。

Practising under timed conditions with a full mock paper is one of the most effective revision strategies. Compare your answers to a mark scheme, identify gaps and rewrite the weaker sections. This active approach builds the precision and confidence needed for the real exam.

在限时条件下完成整套模拟卷是最有效的复习策略之一。将答案与评分标准对照，找出差距并重写薄弱部分。这种主动式练习能培养正式考试中所需的精准度与自信心。

Published by TutorHao | Economics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）

SQA Economics Unit Test Mock Exam Analysis | SQA 经济单元测试模拟卷解析