📚 Case Study Practice: Year 8 Cambridge Economics | 案例分析实战演练
Welcome to this practical case study walkthrough designed especially for Year 8 Cambridge Economics students. In this article, we will examine a realistic and engaging scenario – Tom’s Lemonade Stand – to apply fundamental economic concepts such as scarcity, opportunity cost, factors of production, costs, demand, pricing and profit. By working through each step, you will learn how to analyse a simple business situation just like a real economist. Let’s get started!
欢迎来到这个专为剑桥八年级经济学学生设计的案例分析实战演练。在这篇文章中，我们将分析一个真实有趣的场景——汤姆的柠檬水摊——来运用稀缺性、机会成本、生产要素、成本、需求、定价和利润等基本经济概念。通过逐步练习，你将学会像真正的经济学家一样分析一个简单的商业情境。让我们开始吧！
1. Introducing the Case | 案例介绍
Tom is a Year 8 student who wants to earn some extra pocket money during the summer holidays. He decides to set up a lemonade stand in the local park on sunny weekends. Tom has saved £20 from his birthday money, which he can use to start the business. He will need to buy lemons, sugar, disposable cups, a large jug, ice and some cardboard to make a sign. He also has a small folding table at home that he can borrow for free. Tom hopes that by selling refreshing lemonade, he can make a nice profit.
汤姆是一名八年级学生，想在暑假期间赚些额外的零花钱。他决定在晴朗的周末到当地公园摆一个柠檬水摊。汤姆用生日红包攒下了 20 英镑，可以作为创业资金。他需要购买柠檬、糖、一次性杯子、一个大水壶、冰块以及一些用来制作招牌的纸板。家里还有一张闲置的小折叠桌，可以免费使用。汤姆希望通过售卖清爽的柠檬水赚到一笔不错的利润。
2. Identifying Scarce Resources | 识别稀缺资源
In economics, the basic problem is scarcity – our wants are unlimited, but the resources to satisfy them are limited. Tom faces several scarce resources: his start‑up money is only £20, his time on the weekend is limited, the number of sunny days in the summer is finite, and even the space in the park might be limited if other people want to use the same spot. Because of scarcity, Tom cannot have everything he wants and must make careful choices.
在经济学中，基本问题是稀缺性——我们的欲望是无限的，但满足欲望的资源是有限的。汤姆就面临着几种稀缺资源：他的启动资金只有 20 英镑，周末时间有限，夏季的晴朗天数有限，甚至公园的场地也可能稀缺，因为其他人也可能想在同一位置摆摊。由于稀缺性的存在，汤姆不可能拥有一切，必须做出谨慎的选择。
3. Opportunity Cost in Decisions | 决策中的机会成本
Every choice Tom makes involves an opportunity cost – the value of the next best alternative given up. If Tom decides to use his £20 to buy lemons and sugar, he cannot use that £20 to purchase the new video game controller he has had his eye on. The opportunity cost of investing in the lemonade stand is the enjoyment he would have gained from the game controller. Similarly, if he spends Saturday selling lemonade, the opportunity cost is the fun he could have had playing football with his friends. Thinking about opportunity cost helps Tom decide whether the lemonade stand is really the best use of his money and time.
汤姆做出的每一个选择都包含着机会成本——即所放弃的次优替代品的价值。如果汤姆决定用这 20 英镑购买柠檬和糖，他就无法用它去买心仪已久的新游戏手柄。投资柠檬水摊的机会成本，就是他从游戏手柄中获得的乐趣。同样，如果他用周六时间卖柠檬水，机会成本就是与朋友踢足球的快乐。考虑机会成本可以帮助汤姆判断柠檬水摊是否真的是金钱和时间的最佳用途。
4. Factors of Production | 生产要素
Every business relies on the four factors of production: land, labour, capital and enterprise. For Tom’s lemonade stand, the land is the park area where he sets up his table; labour is his own effort in preparing the lemonade, serving customers and cleaning up; capital includes the physical tools such as the folding table, the jug, cups and his cash box; and enterprise is Tom’s business idea, his willingness to take risks and his skill in organising all the other factors. Even a small stand shows how these factors work together.
任何企业都依赖四大生产要素：土地、劳动力、资本和企业。对于汤姆的柠檬水摊，土地是他在公园摆摊的场地；劳动力是他自己制作柠檬水、服务顾客和清理的付出；资本包括折叠桌、水壶、杯子和收银盒等实物工具；企业则是指汤姆的商业创意、承担风险的意愿以及组织协调其他要素的能力。即便是一个小摊子，也能展示这些要素如何协同工作。
5. Fixed and Variable Costs | 固定成本与可变成本
Tom’s costs can be divided into fixed costs and variable costs. Fixed costs do not change with the number of cups sold. For example, the jug (£5) and the materials for the sign (£1) are one-off fixed costs, totalling £6. His table is free, so it does not count as a cost. Variable costs depend directly on how much lemonade he makes. Each cup requires half a lemon, a spoonful of sugar and a disposable cup, costing approximately £0.30 per cup. The table below summarises the costs.
汤姆的成本可以分为固定成本和可变成本。固定成本不随销售杯数的变化而改变。例如，水壶（5 英镑）和招牌材料（1 英镑）是一次性固定成本，合计 6 英镑。他的桌子是免费的，因此不算成本。可变成本直接取决于生产多少杯柠檬水。每杯需要半个柠檬、一勺糖和一个一次性杯子，每杯成本约 0.30 英镑。下表总结了这些成本。
| Cost Type | Item | Amount |
|---|---|---|
| Fixed Cost | Jug | £5.00 |
| Fixed Cost | Sign materials | £1.00 |
| Variable Cost | Per cup (lemon, sugar, cup) | £0.30 |
成本类型 | 项目 | 金额
固定成本：水壶 £5.00，招牌材料 £1.00；可变成本：每杯（柠檬、糖、杯子）£0.30。
6. Understanding Demand | 理解需求
Demand for lemonade depends on several factors. On a hot, sunny day, many people walking in the park will want a cold drink, so demand will be high. If the weather is cloudy or rainy, very few people will want lemonade, and demand will fall. The price of substitutes also matters: if an ice cream van is parked nearby selling cold treats at a lower price, some customers might buy ice cream instead. In general, there is an inverse relationship between price and quantity demanded – if Tom raises his price, he will probably sell fewer cups.
对柠檬水的需求取决于几个因素。在炎热晴朗的日子里，许多在公园散步的人会想要一杯冷饮，因此需求量很大。如果天气多云或下雨，很少人会想喝柠檬水，需求就会下降。替代品的价格也很重要：如果附近停着一辆冰淇淋车，以更低的价格售卖冷饮，一些顾客可能就会去买冰淇淋。一般来说，价格与需求量之间存在反向关系——如果汤姆提高价格，他卖出的杯数很可能会减少。
7. Setting the Price | 确定价格
Tom needs to decide how much to charge per cup. He considers the costs and what customers are willing to pay. He notices that a similar drink in the café costs around £2.00, but as a small stand he can charge a little less. He decides to set a price of £1.50 per cup, which is well above his variable cost of £0.30, so each sale makes a good contribution. If the weather is favourable, he hopes to sell around 50 cups in a day, generating enough revenue to cover all his costs and leave a healthy profit.
汤姆需要决定每杯收取多少钱。他考虑了成本和顾客愿意支付的价格。他注意到咖啡馆里类似饮品售价约 2.00 英镑，但作为小摊位，他可以定价稍低。他决定每杯定价 1.50 英镑，这远高于 0.30 英镑的可变成本，因此每笔销售都有不错的贡献。如果天气好，他希望在一天内卖出约 50 杯，从而产生足够收入覆盖所有成本并留下可观利润。
8. Calculating Profit or Loss | 计算利润或亏损
Profit is the reward for taking a risk. To find Tom’s profit, we use the simple formula:
Profit = Total Revenue – Total Cost
Total Revenue is the price × quantity sold. If Tom sells 50 cups at £1.50 each, his total revenue is 50 × £1.50 = £75. His total variable cost is 50 × £0.30 = £15. Adding the fixed cost of £6 gives a total cost of £21. Therefore, his profit is £75 – £21 = £54. However, if the weather turns bad and he sells only 10 cups, total revenue would be £15, total cost would be £3 + £6 = £9, leaving a much smaller profit of £6. This shows how sensitive profit is to sales volume.
利润是承担风险的回报。要计算汤姆的利润，我们使用简单的公式：利润 = 总收入 – 总成本。总收入是价格 × 销售数量。如果汤姆以每杯 1.50 英镑卖出 50 杯，总收入为 50 × £1.50 = £75。总可变成本为 50 × £0.30 = £15，加上固定成本 £6，总成本为 £21。因此，他的利润为 £75 – £21 = £54。然而，如果天气转坏只卖出 10 杯，总收入则为 £15，总成本为 £3 + £6 = £9，利润仅为 £6。这表明利润对销售量非常敏感。
9. The Role of Competition | 竞争的作用
If another student, Lucy, also opens a lemonade stand in the same park, Tom will face direct competition. Customers now have a choice, and they might go to whichever stand offers a lower price or a better‑tasting drink. Competition might force Tom to reduce his price to £1.20 per cup, which would squeeze his profit margin. He could respond by differentiating his product – for example, by offering a “strawberry lemonade” flavour or a loyalty card system. Competition encourages businesses to become more efficient and to think creatively about how to attract customers.
如果另一个学生露西也在同一个公园开柠檬水摊，汤姆将面临直接竞争。顾客现在有了选择，他们可能会去价格更低或味道更好的摊位。竞争可能迫使汤姆将价格降到每杯 1.20 英镑，这会压缩他的利润空间。他可以通过产品差异化来应对——例如，推出“草莓柠檬水”口味或推出积分卡制度。竞争促使企业提高效率，并创造性地思考如何吸引顾客。
10. Evaluation and Conclusion | 评估与结论
This case study shows how even a simple lemonade stand involves almost all the key concepts of Year 8 economics. Tom had to manage scarce resources, weigh opportunity costs, combine factors of production, control his costs, understand demand, set a smart price and respond to competition. By calculating profit and considering “what‑if” scenarios, he can make better decisions. Always remember that real businesses, from corner shops to multinational companies, face the same economic questions. Practising with small case studies like this one builds strong analytical skills that will serve you well throughout your economics course.
这个案例表明，即使是一个简单的柠檬水摊，也几乎涉及了八年级经济学的所有关键概念。汤姆必须管理稀缺资源、权衡机会成本、组合生产要素、控制成本、理解需求、设定明智的价格以及应对竞争。通过计算利润并考虑“假定”情景，他可以做出更好的决策。请始终记住，从街角小店到跨国公司，现实中的企业都面临同样的经济问题。像这样通过小型案例分析进行演练，可以培养强大的分析技能，这将在你的整个经济学课程中大有裨益。
Published by TutorHao | Economics Revision Series | aleveler.com
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