📚 Case Study Practice for Year 11 WJEC Economics | Year 11 WJEC经济案例分析实战演练
Case study questions form the backbone of WJEC GCSE Economics exams. They test not only your ability to recall facts but to apply, analyse and evaluate economic ideas in a real-world scenario. In this article, we walk through a complete case study on the proposed sugar tax, demonstrating how to structure answers, use evidence and develop higher-order thinking skills. Whether you are preparing for Unit 1 or Unit 2, the techniques shown here will help you access top marks.
案例分析题是WJEC GCSE经济考试的核心。它不仅考察你对事实的记忆，更要求你将经济理念应用于真实情境，进行分析与评估。本文以拟议中的含糖饮料税为案例，完整演示如何组织答案、运用证据并发展高阶思维能力。无论你在准备第一单元还是第二单元，这里展示的技巧都将帮助你冲击高分。
1. Understanding the Case Context | 理解案例背景
Before writing anything, read the case material twice. Underline the product, the market, the economic problem and any policy options mentioned. For example, the government is considering a tax on sugary drinks to reduce obesity. Note key facts: current consumption levels, health costs, price elasticity and who would be affected.
在动笔之前，请将案例材料读两遍。用下划线标出产品、市场、经济问题以及提到的任何政策选项。例如，政府正考虑对含糖饮料征税以减少肥胖。记录关键事实：当前消费水平、健康成本、价格弹性以及受影响的人群。
Create a quick mind map linking these facts to economic concepts you know. This prevents you from missing important links later.
快速画一个思维导图，将这些事实与你学过的经济概念关联起来。这能防止你在后续答题时遗漏重要联系。
2. Spotting Economic Concepts | 识别关键经济概念
Every case study is built around core concepts such as scarcity, opportunity cost, demand, supply, externalities and market failure. In the sugar tax example, negative externalities from overconsumption of sugar lead to market failure. The tax is an indirect tax aimed at internalising the externality.
每个案例都围绕核心概念构建，如稀缺性、机会成本、需求、供给、外部性与市场失灵。在糖税案例中，糖分过度消费产生的负外部性导致了市场失灵。这一税收是旨在使外部性内部化的间接税。
Furthermore, concepts like price elasticity of demand (PED) are crucial. If demand for sugary drinks is inelastic, the tax may not reduce consumption much but will raise significant revenue. If elastic, consumption falls sharply. Recognising these concepts allows you to produce precise analysis.
此外，需求价格弹性（PED）等概念至关重要。如果含糖饮料的需求缺乏弹性，税收可能不会大幅减少消费，但会带来可观的财政收入。如果富有弹性，消费则会急剧下降。识别这些概念能让你进行精准的分析。
3. Interpreting Data and Charts | 解读数据与图表
You will often be given tables, bar charts or line graphs. In our sugar tax case, imagine a table showing annual per capita consumption of sugary drinks in the UK: 2015 – 110 litres, 2020 – 95 litres, 2025 (projected with tax) – 78 litres. Always describe the trend first, then calculate percentage changes to support your point.
你经常会遇到表格、条形图或折线图。在我们的糖税案例中，设想一张表格显示英国人均含糖饮料年消费量：2015年—110升，2020年—95升，2025年（征税后预测）—78升。先描述趋势，再计算百分比变化以支撑你的观点。
From 2015 to 2020, consumption fell by 13.6%. The tax is projected to accelerate this decline, bringing a further 17.9% drop. Use numbers precisely: ‘a fall from 110 to 78 litres represents a 29% overall reduction’. Such quantification impresses examiners.
从2015年到2020年，消费下降了13.6%。预计税收会加速这一下降，再带来17.9%的降幅。准确使用数字：“从110升降至78升表示总体上减少了29%”。这样的量化会给考官留下深刻印象。
4. Drawing Demand and Supply Diagrams | 绘制供求图分析
In the exam, a well-labelled diagram can earn multiple marks. For the sugar tax, draw a leftward shift in the supply curve due to the indirect tax (S₁ to S₂ + tax). Show the new equilibrium with a higher price and lower quantity. Label P₁, P₂, Q₁, Q₂, and shade the government tax revenue rectangle.
考试中，一张标注清晰的图表可以赢得数分。针对糖税，画出因间接税导致供给曲线左移（S₁ 至 S₂ + tax）。标出价格更高、数量更低的新均衡点。标注 P₁, P₂, Q₁, Q₂，并用阴影标出政府税收收入的矩形区域。
Even if you are not asked to draw a diagram, a sketched one in your planning space helps you structure the analysis. Remember to include the external cost curve (MSC > MPC) if the question focuses on externalities, and show the welfare gain from the tax when consumption falls.
即使题目不要求画图，在草稿区画一张简图也有助于你组织分析。如果问题聚焦外部性，记得画出外部成本曲线（MSC > MPC），并展示因税收减少消费而带来的福利增益。
5. Analysing Impacts on Consumers and Producers | 分析对消费者和生产者的影响
Consumers face higher prices, which reduces their real income and may alter their consumption patterns. Some consumers may switch to diet drinks or water, while low-income households might be disproportionately affected if they spend a higher share of income on such drinks. This is regressive impact.
消费者面临更高的价格，这降低了他们的实际收入，并可能改变其消费模式。部分消费者可能转向无糖饮料或水，而低收入家庭若在含糖饮料上支出占收入比例较高，则可能受更大冲击。这属于累退性影响。
Producers of sugary drinks may see a decrease in sales and profit. Some could reformulate products to avoid the tax, driving innovation. However, smaller producers with tight margins might struggle, potentially leading to job losses in the sector. Both sides must be considered to show evaluation.
含糖饮料的生产者可能面临销量与利润下降。一些厂商可能通过改良产品配方来避税，从而推动创新。然而，利润率较低的小型生产商可能陷入困境，甚至导致该行业就业岗位减少。要体现评估能力，必须兼顾双方分析。
6. Evaluating Government Intervention | 评估政府干预
A sugar tax aims to reduce negative externalities such as higher NHS costs from obesity-related illnesses. The tax revenue could be hypothecated to fund health programmes, creating a double dividend. Yet, if demand is inelastic, consumption may not fall enough to significantly improve health outcomes.
糖税旨在减少负外部性，例如与肥胖相关疾病造成的较高 NHS 费用。税收收入可专项用于资助健康项目，产生双重红利。然而，如果需求缺乏弹性，消费量可能下降不足，无法显著改善健康结果。
Moreover, the tax might create a black market or encourage cross-border shopping. The effectiveness depends on the size of the tax and the availability of substitutes. A high tax is more effective but also more politically contentious. Always weigh these factors in your evaluation.
此外，征税可能催生黑市，或刺激跨境购物。其有效性取决于税收规模与替代品的可获性。高税率更有效，但也更具政治争议。在你的评估中，务必权衡这些因素。
7. Considering Stakeholders | 考虑利益相关者
Identify and rank the stakeholders. In this case: consumers, producers, government, healthcare system, workers in the soft drinks industry, and society at large. For each, explain whether they gain or lose, and to what extent.
识别并对利益相关者排序。在此案例中：消费者、生产者、政府、医疗系统、软饮料行业工人以及整个社会。针对每一方，解释他们是受益还是受损，及其程度如何。
For instance, the government benefits from extra tax revenue and possibly lower healthcare spending in the long run. Society benefits if public health improves. However, consumers who value choice may feel their freedom is eroded. A mature evaluation acknowledges both winners and losers and makes a justified judgement on the net effect.
例如，政府得益于额外的税收收入，并可能长期削减医疗支出。如果公共卫生改善，社会受益。然而，看重选择自由的消费者可能觉得自由受到侵蚀。成熟的评估会承认赢家与输家，并对净影响做出有理有据的判断。
8. Making a Balanced Conclusion | 做出均衡的结论
A strong conclusion does not simply repeat previous points but makes a clear, reasoned judgement. For the sugar tax, you might conclude that while the tax is a useful tool to internalise externalities, its regressive nature and limited impact on obesity suggest it should be combined with other measures, such as public education and subsidies for healthy foods.
有力的结论并非简单重复前文论点，而是做出清晰、有论证的判断。对于糖税，你可能会总结：尽管该税是内部化外部性的有效工具，但其累退性及对肥胖的有限影响意味着，它应与公共教育、健康食品补贴等其他措施结合使用。
Use phrases like ‘On balance’, ‘The most significant factor is…’, or ‘Despite some drawbacks, the evidence suggests…’. This shows you are capable of synthesising the case details into a final, evaluative statement – exactly what top-band answers require.
使用“总体而言”、“最重要的因素是……”或“尽管存在某些不足，证据表明……”等表述。这表明你能够综合案例细节，形成最终的评价性陈述——这正是高分答案所要求的。
9. Practice Walkthrough: Sugar Tax | 实战演练：糖税案例
Let us apply the steps to a sample question: ‘Evaluate the case for a tax on sugary drinks in the UK. Use the data provided and your own economic knowledge.’
让我们对一道样题应用上述步骤：“评估在英国对含糖饮料征税的理由。请使用提供的数据及你自身的经济学知识。”
Step 1: Identify the market failure. Overconsumption of sugar leads to obesity, costing the NHS an estimated £6 billion annually. This is a negative externality in consumption.
第一步：识别市场失灵。糖分过度消费导致肥胖，估计每年给 NHS 带来60亿英镑的成本。这属于消费中的负外部性。
Step 2: Use the data. Suppose a 20 pence per litre tax is proposed. Current consumption is 95 litres per capita, price is £1 per litre. Assume PED is estimated at -0.4 (inelastic). The tax raises price by 20% to £1.20, and quantity demanded falls to about 87.4 litres per capita (a 8% drop). Tax revenue per person = £17.48 annually.
第二步：使用数据。假设提议每升征税20便士。当前消费量为95升/人，价格为1英镑/升。假设需求价格弹性估计为 -0.4（缺乏弹性）。征税使价格上升20%至1.20英镑，人均需求量降至约87.4升（下降8%）。人均年税收为17.48英镑。
Step 3: Analyse the impact. The fall in quantity reduces external costs, but by only 8%. Revenue can fund anti-obesity campaigns. However, the tax is regressive – lower-income groups spend a larger proportion of their income on soft drinks.
第三步：分析影响。数量下降减少了外部成本，但幅度仅为8%。税收收入可用于资助反肥胖运动。然而，该税具有累退性——低收入群体在软饮料上的支出占收入比重更大。
Step 4: Evaluate alternatives. Could a minimum price per unit of sugar be more targeted? What about banning advertising to children? A combination of policies might work better. Also, consider possible unintended consequences: consumers switching to other high-sugar foods.
第四步：评估替代方案。设定每单位糖的最低价格是否更具针对性？禁止向儿童投放广告呢？政策组合可能更有效。同时，还要考虑意想不到的后果：消费者转向其他高糖食品。
Step 5: Conclude. A sugar tax alone is unlikely to solve obesity but can be part of a broader strategy. Its effectiveness hinges on the tax rate and the availability of healthier substitutes. The evidence supports a cautiously positive stance, provided it is combined with education and subsidies for reformulation.
第五步：得出结论。单靠糖税不太可能解决肥胖问题，但它可以成为更广泛战略的组成部分。其有效性取决于税率及更健康替代品的可获性。证据支持谨慎积极的立场，前提是与教育和产品改良补贴相结合。
10. Common Mistakes and How to Avoid Them | 常见错误与避免方法
Mistake 1: Merely describing the case without using economic terms. Fix: Always link facts to theory – mention PED, externalities, government failure.
错误一：仅仅描述案例而不用经济术语。对策：始终将事实与理论联系——提到需求价格弹性、外部性、政府失灵。
Mistake 2: One-sided arguments. Fix: Force yourself to write at least one ‘However’ paragraph that considers the opposite view or limitations.
错误二：片面论述。对策：迫使自己至少写一段“然而”段落，考虑相反观点或局限性。
Mistake 3: Ignoring the data. Fix: Quote numbers directly and calculate simple ratios or percentage changes. Data shows you can apply knowledge.
错误三：忽视数据。对策：直接引用数字，计算简单的比率或百分比变化。使用数据能展示你的应用能力。
Mistake 4: Vague conclusions. Fix: Use evaluative phrases and state clearly which argument outweighs the other, and under what conditions.
错误四：结论模糊。对策：使用评价性表述，明确指出哪个论点更重要，以及在什么条件下成立。
Mistake 5: Rushing into writing without planning. Fix: Spend 3–5 minutes outlining your answer. A clear structure makes your argument flow logically.
错误五：仓促动笔，不加规划。对策：花3至5分钟拟出答题提纲。清晰的结构使论证更具逻辑性。
11. Time Management in the Exam | 考试中的时间管理
WJEC GCSE Economics papers give you limited time per mark. For a 6-mark case study question, allocate roughly 8 minutes. Divide this into: 1 minute reading and planning, 5 minutes writing analysis, 2 minutes for evaluation and checking.
WJEC GCSE经济考试每分答题时间有限。对于一道6分的案例分析题，大致分配8分钟。可细分为：1分钟审题列提纲，5分钟撰写分析，2分钟评估与检查。
Use the mark scheme to guide depth. A simple statement may get 1 mark, a developed point with data 2 marks, and an evaluative point with justified judgement 3 marks. Aim to consistently reach the higher levels by weaving in words like ‘because’, ‘therefore’, ‘however’, and ‘this means that’.
根据评分标准决定深度。一个简单陈述可能得1分，一个有数据支持的展开论述得2分，而一个有合理判断的评价性论点可得3分。通过嵌入“因为”、“因此”、“然而”、“这意味着”等词语，力争持续达到更高分数层次。
12. Final Tips for Case Study Success | 案例分析成功的终极贴士
Treat each case study as a story where you are the economic consultant. Ask yourself: What is the core problem? Who is affected? What does the data reveal? What solutions exist? And crucially, which solution is most justified given the evidence?
将每个案例分析视作一个故事，你就是经济顾问。问自己：核心问题是什么？谁受到影响？数据揭示了什么？存在哪些解决方案？最关键的是，根据证据，哪个解决方案最具合理性？
Practice past papers regularly, timing yourself strictly. After writing, mark your own work using the official mark scheme, noting where you could have added more analysis or evaluation. Over time, this reflective practice builds the instinct to think like an economist under pressure.
定期练习往年真题，严格计时。写完后，对照官方评分标准自行批改，注意哪里可以补充更多分析或评估。久而久之，这种反思性练习会培养你在压力下像经济学家一样思考的本能。
Published by TutorHao | Economics Revision Series | aleveler.com
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