KS3 Cambridge Economics: Case Study Practice & Application | KS3 剑桥经济学：案例分析实战演练

📚 KS3 Cambridge Economics: Case Study Practice & Application | KS3 剑桥经济学：案例分析实战演练

Economics is not just about memorising definitions – it is about understanding how people, businesses and governments make choices in a world of limited resources. Case studies bring these ideas to life, showing how economic concepts apply to real-world situations. This article will guide you through practical case study exercises tailored for the KS3 Cambridge Economics curriculum, helping you develop the analytical skills needed to explain economic problems and decisions with confidence. Each exercise comes with step-by-step guidance in both English and Chinese, so you can practise thinking like an economist.

经济学不只是背定义，而是要理解在资源有限的世界里，个人、企业和政府如何做出选择。案例研究把这些概念变得生动起来，展现经济原理如何在真实情境中应用。本文将带你进行专为KS3剑桥经济学课程设计的案例实战演练，培养你解释经济问题和决策的分析能力。每个练习都配有英文和中文的逐步指导，让你练习像经济学家一样思考。

---

1. What Is a Case Study in Economics? | 经济学中的案例分析是什么？

A case study in economics is a detailed examination of a real or realistic scenario. It might describe a small bakery deciding what to produce, a government introducing a new tax or a teenager choosing how to spend pocket money. The goal is to apply economic principles – such as scarcity, opportunity cost or supply and demand – to explain what is happening and predict outcomes.

经济学中的案例分析是对真实或贴近现实的情境进行详细研究。它可能描述一家小面包店决定生产什么、政府实施新税或一位少年如何支配零花钱。其目标是用稀缺性、机会成本、供需等经济原理解释现象并预测结果。

Case studies help you:

案例分析能帮助你：

• Connect theory to everyday life.
• 将理论与日常生活联系起来。
• Practise identifying economic problems and solutions.
• 练习识别经济问题和解决方案。
• Improve written reasoning and evaluation skills.
• 提高书面推理和评估能力。
• Prepare for exam-style questions that ask ‘Explain’ or ‘Discuss’.
• 为要求”解释”或”讨论”的考试题型做好准备。

---

2. Why Case Studies Matter in KS3 Economics | 为什么案例分析对KS3经济学至关重要

At KS3 level, Cambridge Economics introduces core concepts that form the foundation for IGCSE and beyond. Case studies make abstract ideas tangible. For example, instead of just stating ‘the price of a good rises when demand increases’, a case study lets you see how this happens when a new smartphone is launched and queues form outside shops.

在KS3阶段，剑桥经济学引入了为IGCSE及更高层次奠定基础的核心概念。案例研究让抽象理念变得具体可感。例如，与其只是陈述”需求增加时商品价格会上涨”，不如通过案例亲眼看到一款新智能手机发布时店外排起长队，价格如何随之变化。

By working through cases, you learn to:

通过分析案例，你将学会：

• Spot key economic players: households, firms and governments.
• 识别关键经济主体：家庭、企业和政府。
• Recognise trade-offs and decisions made under scarcity.
• 认出在稀缺条件下做出的权衡与决策。
• Use diagrams or tables to organise information, even mentally.
• 使用图表或表格整理信息，哪怕只是在脑中。
• Write structured answers using the ‘PEEL’ method (Point, Evidence, Explanation, Link).
• 用PEEL结构（观点、证据、解释、联系）写出有条理的答案。

---

3. The Four-Step Approach to Analysing a Case Study | 分析案例的四步法

Before diving into examples, adopt this simple framework every time you encounter an economic case:

在接触具体案例之前，每次遇到经济案例都请采用这套简单框架：

Step 1: Identify the basic economic problem. What is scarce? Who is making the choice?

第一步：识别基本经济问题。什么稀缺？谁在做选择？

Step 2: Apply relevant concepts. Think of opportunity cost, incentives, elasticity, market structures or government intervention.

第二步：应用相关概念。想想机会成本、激励、弹性、市场结构或政府干预。

Step 3: Use evidence from the case. Quote numbers, dates or specific details given.

第三步：使用案例中的证据。引用给出的数字、日期或具体细节。

Step 4: Evaluate. Consider short-run vs long-run, different stakeholders or unintended consequences.

第四步：评估。考虑短期与长期、不同利益相关方或意外后果。

---

4. Case 1: Scarcity and Choice – The Bakery in a Small Town | 案例1：稀缺性与选择 – 小镇面包店

Scenario (read in English first, then Chinese): A small bakery has only one oven that can bake 20 loaves of bread or 40 cakes each morning. The owner notices customers are asking for more cakes, but bread is a daily essential for many families. Flour, time and labour are limited.

情境：一家小面包店只有一个烤箱，每天早晨最多能烤20条面包或40个蛋糕。店主发现顾客对蛋糕的需求在增加，但面包是许多家庭的每日必需品。面粉、时间和劳动力都有限。

Question 1: What is the basic economic problem here?

问题1：这里的基本经济问题是什么？

Answer: Scarcity. The oven’s capacity, the baker’s time and the amount of flour are limited resources, while wants for both bread and cakes are unlimited. The bakery cannot produce as much as everyone wants.

答案：稀缺性。烤箱的容量、面包师的时间和面粉数量都是有限的资源，而人们对面包和蛋糕的欲望是无限的。面包店无法生产出所有人想要的那么多。

Question 2: What is the opportunity cost if the bakery decides to produce only cakes?

问题2：如果面包店决定只生产蛋糕，机会成本是什么？

Answer: The opportunity cost is the 20 loaves of bread that could have been baked instead. The next best alternative forgone is the bread, along with the satisfaction and nutrition it would have provided to customers.

答案：机会成本是本可以烘烤的20条面包。被放弃的次优选择就是面包，以及它本可为顾客带来的满足感和营养。

Question 3: Suggest one factor the owner should consider when choosing what to bake.

问题3：建议店主在选择烘烤什么时应考虑的一个因素。

Answer: The owner should compare the profit margin on each product. If a cake sells at a higher price and costs only slightly more to make, producing more cakes might be wiser. But if bread brings steady, loyal customers who also buy other items, losing bread might reduce overall revenue in the long run.

答案：店主应该比较每种产品的利润率。如果蛋糕售价更高而成本只稍微多一点点，多生产蛋糕可能更明智。但如果面包能带来稳定忠诚的顾客，他们还会买其他商品，失去面包长期可能减少总收入。

---

5. Case 2: Demand and Supply – The Smartphone Market | 案例2：需求与供给 – 智能手机市场

Scenario: A popular brand releases a new smartphone model with a much-improved camera. At the same time, a shortage of microchips limits production. Before release, the pre-order queue reaches 500,000 and the company sets a launch price of £799.

情境：一个热门品牌发布了一款摄像头大幅升级的新智能手机。同时，芯片短缺限制了生产。发布前，预订队列已达50万人，公司将发售价格定为799英镑。

Question 4: Using demand and supply, explain why the launch price is set high.

问题4：运用需求与供给，解释为什么发售价格定得高。

Answer: Demand for the new phone is very high because of strong brand loyalty and a desirable new feature (the camera). Meanwhile, supply is constrained by the chip shortage, meaning fewer units can be produced. High demand combined with limited supply puts upward pressure on price. The firm can set a high price and still sell out.

答案：新手机的需求非常高，因为品牌忠诚度强且新摄像头功能令人期待。与此同时，芯片短缺导致供应受限，能生产的数量更少。高需求碰上有限的供应给价格带来上升压力。公司可以定高价而依然售罄。

Question 5: Illustrate how the market might change after six months.

问题5：阐述六个月后市场可能会如何变化。

Answer: After six months, the initial excitement may cool down and competitors might launch similar models, reducing demand for this particular phone. Chip supply could improve, allowing higher production. Unless the firm restricts supply further, the price is likely to fall to clear the market. Some retailers might offer discounts.

答案：六个月后，最初的热度可能消退，竞争者可能推出类似机型，降低了对这款手机的需求。芯片供应可能改善，让产量得以提高。除非公司进一步限制供应，价格很可能下跌以出清市场。一些零售商会提供折扣。

---

6. Case 3: Opportunity Cost – Lily’s Decision | 案例3：机会成本 – 莉莉的决策

Scenario: Lily has £30 saved from her birthday. She is torn between buying a video game she has wanted for months and treating her two best friends to a cinema trip. The game costs exactly £30, while the cinema trip would cost £15 per person (Lily plans to pay for all three tickets) – but £30 only covers two tickets, so she cannot afford both options fully.

情境：莉莉存了30英镑生日钱。她在买一直想要的电子游戏和请两位好朋友看电影之间犹豫不决。游戏正好30英镑，而电影票每人15英镑（莉莉打算给三人都买），但30英镑只够两张票，无法完全负担两个选择。

Question 6: What is the opportunity cost if Lily buys the video game?

问题6：如果莉莉买了电子游戏，机会成本是什么？

Answer: The opportunity cost is the cinema trip with her friends. More precisely, it is the enjoyment and shared experience she would have gained from the outing, plus the goodwill of treating her friends. Even though she cannot afford all three tickets, she could choose to pay for two and ask friends to contribute, but the next best alternative given up is still the cinema experience.

答案：机会成本是与朋友一起看电影的经历。更准确地说，是她本可以从外出活动中获得的乐趣、分享体验以及请客带来的友谊好感。尽管她买不起三张票，但她可以选择买两张让朋友凑钱，但被放弃的次优选择仍然是看电影的体验。

Question 7: Explain how scarcity influences Lily’s choice.

问题7：解释稀缺性如何影响莉莉的选择。

Answer: Lily’s limited money (£30) is the scarce resource. Her unlimited wants (a game and a social outing) exceed what she can afford. She must make a choice, highlighting the fundamental economic problem: finite resources force trade-offs.

答案：莉莉有限的金钱（30英镑）就是稀缺资源。她无限的欲望（游戏和社交外出）超过了她的支付能力。她必须做出选择，这突显了基本经济问题：有限资源迫使权衡取舍。

---

7. Case 4: Market Structures – Local Cafe vs Chain | 案例4：市场结构 – 本地咖啡馆与连锁店

Scenario: On High Street, there is a single independent coffee shop, ‘Brew & Bean’, run by a family. It sells high-quality, handcrafted drinks and pastries. Recently, a large chain ‘GlobalGrind’ opened two doors away, offering lower prices because it buys beans in bulk and uses automated machines. Brew & Bean notices a 30% drop in customers within a month.

情境：在商业街上，有一家家庭经营的独立咖啡馆’Brew & Bean’，出售高品质手工饮品和糕点。最近，大型连锁店’GlobalGrind’在相隔两个门面处开业，因其大量采购咖啡豆并使用全自动机器，价格更低。一个月内Brew & Bean的顾客减少了三成。

Use a table to compare the two businesses in terms of market structure features:

用表格从市场结构特征比较这两家企业：

Feature	Brew & Bean (Independent)	GlobalGrind (Chain)
Number of sellers	One in the local area, but many independent cafes overall / 当地一家，但总体有许多独立咖啡馆	Many branches worldwide, large market share / 全球众多门店，市场份额大
Type of product	Differentiated: handcrafted, unique flavour, personal service / 差异化：手工、独特风味、个性化服务	Standardised: same menu, same taste globally / 标准化：全球相同菜单、相同口味
Barriers to entry	Low: small capital needed, easy to start / 低：所需资本少，容易起步	High: huge investment, brand recognition, economies of scale / 高：巨额投资、品牌认知、规模经济
Pricing power	Limited: must charge enough to cover costs, some loyal customers / 有限：必须定够高以覆盖成本，有一些忠实顾客	Significant: can set low prices to drive out rivals / 很强：可定低价驱逐竞争对手

Question 8: Explain which market structure the coffee shop market resembles, using evidence.

问题8：用证据解释咖啡馆市场近似哪种市场结构。

Answer: The market resembles monopolistic competition. There are many sellers (independent cafes and chains), products are differentiated (Brew & Bean’s handcrafted drinks versus GlobalGrind’s standardised ones), and there are relatively low barriers to entry for small cafes, though larger chains enjoy some monopoly power due to brand and cost advantages. Competition focuses on quality, service and location.

答案：该市场近似垄断竞争。卖家众多（独立咖啡馆与连锁店），产品有差异（Brew & Bean的手工饮品与GlobalGrind的标准化产品），对小型咖啡馆进入壁垒较低，不过大连锁因品牌和成本优势享有一定垄断力量。竞争集中在质量、服务和地段。

---

8. Case 5: Government Intervention – Impact of a Sugar Tax | 案例5：政府干预 – 糖税的影响

Scenario: The government introduces a tax of 20 pence per litre on sugary fizzy drinks to reduce obesity. Before the tax, a 2-litre bottle cost £1.20. After the tax, producers raise the price to £1.50. Sales drop by 15% in the first year, but the government collects £300 million, which it uses to fund school sports.

情境：政府为减少肥胖对含糖汽水征收每升20便士的税。征税前，一瓶2升装汽水售价1.20英镑；征税后，生产商将价格提高到1.50英镑。第一年销量下降15%，但政府征得3亿英镑税款，用于资助学校体育。

Question 9: What type of intervention is this, and what is its primary aim?

问题9：这是哪种干预措施，其主要目标是什么？

Answer: This is an indirect tax (a tax on goods rather than on income). Its primary aim is to correct a negative externality – the social cost of obesity and health problems – by making sugary drinks more expensive, thereby reducing consumption (the ‘discouraging’ effect).

答案：这是一种间接税（对商品征税而非对收入征税）。其主要目标是纠正负外部性——肥胖和健康问题的社会成本——通过让含糖饮料更贵来降低消费（”抑制”效应）。

Question 10: Explain two effects of this tax using evidence from the case.

问题10：利用案例中的证据解释这种税的两个效应。

Answer: First, the price increase from £1.20 to £1.50 shows the tax is partly passed on to consumers, making them pay 30 pence more. Second, the 15% fall in sales indicates that demand for sugary drinks is responsive to price – the tax succeeded in reducing quantity demanded. Additionally, the £300 million revenue gave the government money to fund positive health initiatives, like school sports, which can further reduce obesity.

答案：首先，价格从1.20英镑涨到1.50英镑表明税收部分转嫁给了消费者，使他们多付30便士。其次，销量下降15%说明对含糖饮料的需求对价格有反应——税成功地减少了需求量。此外，3亿英镑税收使政府有钱资助积极的健康项目，如学校体育，从而进一步减少肥胖。

---

9. Common Mistakes When Tackling Case Studies | 案例分析中的常见错误

Even strong students stumble here. Watch out for these pitfalls:

即使成绩优秀的学生也会在此失分。注意以下陷阱：

Mistake 1: Describing the situation without using economics vocabulary. Simply retelling the story is not enough – you must apply terms like ‘scarcity’, ‘opportunity cost’, ‘shift in demand curve’ or ‘price elasticity’.

错误1：描述情况却不使用经济学词汇。简单复述故事并不够——必须运用”稀缺性””机会成本””需求曲线移动”或”价格弹性”等术语。

Mistake 2: Ignoring the data. If a case gives numbers (e.g., 20 loaves, 40 cakes, 15% drop), quote them directly to support your point.

错误2：忽略数据。如果案例给出了数字（如20条面包、40个蛋糕、下降15%），要直接引用来支持你的观点。

Mistake 3: Focusing only on one side. In evaluation, you must mention winners and losers, or short-term vs long-term effects. For example, a sugar tax helps health but may hurt small soft drink businesses.

错误3：只关注一面。在评估中，必须提及受益方与受损方，或短期与长期影响。例如，糖税有益健康但可能伤害小型软饮料企业。

Mistake 4: Not structuring answers. Use short paragraphs, connective phrases (‘As a result’, ‘In contrast’, ‘Therefore’) and a clear sequence.

错误4：答案缺乏结构。应使用短段落、连接短语（”结果””相比之下””因此”）和清晰的顺序。

---

10. Practice Challenge: Mixed Case – The School Canteen Conundrum | 实战挑战：混合案例 – 学校食堂难题

Now try this combined scenario using all the skills practised. A school canteen has a fixed budget of £500 per week to buy ingredients. It could offer a choice between a healthy salad bar (costs £3 per meal to produce, can serve 200 students) and a fast-food counter (burgers and chips, costs £1.80 per meal, can serve 300 students). The school wants to promote healthy eating, but student surveys show 70% prefer fast food. The head teacher is considering a rule that only healthy options be sold on Mondays and Wednesdays.

现在用所练技能试试这个组合情景。某学校食堂每周有500英镑固定预算采购食材。它可以在健康沙拉吧（生产成本每份3英镑，可供200名学生）和快餐柜台（汉堡和薯条，成本每份1.80英镑，可供300名学生）之间选择。学校想倡导健康饮食，但学生调查显示70%更喜欢快餐。校长正考虑一项规定：周一和周三只出售健康选项。

Your task: Answer the following in full sentences.

你的任务：用完整句子回答以下问题。

English: Identify the scarce resource. (1 mark) / 中文：识别稀缺资源。（1分）

Answer: The scarce resource is the weekly budget of £500, which limits how many meals can be produced. Time and kitchen space may also be scarce but are not stated. / 答案：稀缺资源是每周500英镑的预算，它限制了能生产多少份餐食。时间和厨房空间可能也有限但未提及。

English: Calculate the opportunity cost if the canteen uses the entire budget on the fast-food counter. (2 marks) / 中文：如果食堂将全部预算用于快餐柜台，计算机会成本。（2分）

Answer: With £500 budget, the fast-food counter can produce £500 ÷ £1.80 = about 277 meals (assuming no other costs). The opportunity cost is the healthy salad bar meals forgone. If the same budget spent on salad bar yields £500 ÷ £3 = 166 meals, the opportunity cost is 166 healthy meals. / 答案：用500英镑预算，快餐柜台可生产500 ÷ 1.80 ≈ 277份餐（假设无其他成本）。机会成本是被放弃的健康沙拉吧餐食。如果把预算全用于沙拉吧，可提供500 ÷ 3 ≈ 166份，所以机会成本是166份健康餐。

English: Explain one demand-side reason why 70% of students prefer fast food. (3 marks) / 中文：解释70%学生偏好快餐的一个需求侧原因。（3分）

Answer: Students’ tastes and preferences heavily influence their demand. Fast food is often seen as tastier, more filling and familiar. The high percentage indicates a strong preference for this option, which shifts the demand curve for fast food to the right. Price may also matter: at £1.80 per meal, it is more affordable than a £3 salad, so the quantity demanded is higher partly due to the lower price. / 答案：学生的口味和偏好极大地影响他们的需求。快餐通常被视作更美味、更饱腹且更熟悉。高比例表明对这一选项的强烈偏好，使得快餐的需求曲线向右移动。价格可能也起作用：每份1.80英镑比3英镑的沙拉更实惠，所以需求量较高部分源于低价。

English: Evaluate the head teacher’s rule: would it be effective in encouraging healthy eating? (4 marks) / 中文：评估校长的规定：它能否有效鼓励健康饮食？（4分）

Answer: On one hand, forcing two days of only healthy options directly increases salad bar consumption, perhaps exposing students to healthier food and shifting long-term preferences. Revenue on those days will come from salad sales, though some students might bring packed lunch instead, reducing total canteen sales. On the other hand, if students feel resentful, they may buy even more fast food on the other three days – a rebound effect. The rule might also lead to longer queues at the salad bar if capacity cannot meet demand. Overall, the rule can be a start, but its success depends on marketing the healthy option, keeping prices affordable and ensuring the salad bar is appealing; otherwise, it could reduce canteen revenue and student satisfaction without a lasting change in eating habits. / 答案：一方面，强制两天只供应健康选项直接增加了沙拉吧的消费，可能让学生接触更健康的食品并改变长期偏好。那两天的收入将来自沙拉销售，但可能会有学生自带午餐，从而降低食堂总销量。另一方面，如果学生感到不满，他们可能在另外三天购买更多快餐——产生反弹效应。若沙拉吧产能无法满足需求，还可能导致排队时间变长。总体而言，这项规定可以作为一个开始，但其成功取决于对健康选项的宣传、保持价格亲民以及确保沙拉吧吸引人；否则，可能会降低食堂收入和学生的满意度，且无法带来持久的饮食习惯改变。

---

11. How to Improve Your Case Study Skills | 如何提升案例分析能力

Regular practice is key. Try these tips:

定期练习是关键。试试以下建议：

• Read news articles about business, taxes or consumer trends and ask yourself: What is the economic issue here? Write a short paragraph applying one core concept.
• 阅读关于商业、税收或消费趋势的新闻，问自己：这里的经济问题是什么？写一小段话，运用一个核心概念。
• Swap cases with a classmate. Answer each other’s questions and then compare how you used concepts differently.
• 与同学交换案例。彼此回答对方的问题，然后比较你们运用概念的方式有何不同。
• Create your own mini cases based on family decisions (e.g., holiday choice, mobile phone plan). Teaching someone else reinforces learning.
• 根据家庭决策（例如度假选择、手机套餐）自创小案例。教别人会加深自己的学习。
• Always plan your answer before writing: jot down the concept, the evidence and the evaluation point.
• 写作前务必先计划：草草记下概念、证据和评估点。

---

12. Putting It All Together – Key Takeaways | 总结 – 要点回顾

Case studies transform you from a passive learner into an active economic thinker. Remember the four steps: identify the scarcity or problem, apply concepts, use specific data and evaluate. With every case you work through, you sharpen your ability to see the world through an economist’s eyes – and that is a skill that lasts far beyond the classroom.

案例分析能将你从被动学习者转变为主动的经济思考者。牢记四步：识别稀缺性或问题、应用概念、使用具体数据并评估。每完成一个案例，你都在磨练以经济学家眼光看世界的能力——这一技能将远超课堂受用。

Keep practising with the cases above, and don’t hesitate to ask ‘What is the opportunity cost?’ or ‘Who benefits and who loses?’ in everyday situations. That habit is the hallmark of a strong economics student.

坚持用上述案例练习，并在日常生活中大胆发问”机会成本是什么？”或者”谁受益、谁受损？”。这一习惯正是一名优秀经济学学生的标志。

Published by TutorHao | Economics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）