📚 Case Study Practical Drill | 案例分析实战演练
Case studies are a powerful way to apply economic theory to real-world situations. In Year 8 Economics, you will encounter scenarios that require you to think like an economist — identifying scarce resources, weighing up choices, and predicting how people respond to incentives. This article provides a practical drill to sharpen your case study analysis skills.
案例分析是将经济理论应用于现实情境的强大方法。在八年级经济学中，你会遇到各种场景，需要像经济学家一样思考——识别稀缺资源、权衡选择，并预测人们如何对激励做出反应。本文提供了一次实战演练，帮助你提升案例分析的能力。
1. What is a Case Study in Economics? | 什么是经济学案例分析？
A case study in economics presents a short story about an economic problem or decision facing an individual, a business, or a government. It typically includes background data, constraints, and the choices available. Your task is to use economic concepts to explain what is happening and to suggest the best course of action.
经济学案例分析讲述一个关于个人、企业或政府面临的经济问题或决策的短篇故事。它通常包含背景数据、限制条件和可用的选择。你的任务是用经济概念来解释正在发生的事情并提出最佳行动方案。
The goal is not simply to describe events, but to uncover the economic logic behind them. This means identifying who is making decisions, what scarce resources are involved, and what trade-offs they face. A good case study answer uses specific terms like opportunity cost, demand, or incentives.
目标不仅仅是描述事件，而是揭示其背后的经济逻辑。这意味着要找出谁是决策者，涉及哪些稀缺资源，以及他们面临怎样的权衡。一份好的案例分析答案会使用像机会成本、需求或激励这样的专门术语。
In an exam, you might be given a paragraph about a lemonade stand, a school fundraiser, or a family budget. Practising with such cases helps you move from memorising definitions to applying economics in a way that mirrors how real economists work.
在考试中，你可能会得到关于柠檬水摊、学校筹款或家庭预算的一段文字。通过此类案例进行练习，有助于你从记忆定义转向像真正的经济学家那样应用经济学。
2. Key Economic Concepts to Apply | 需要应用的关键经济概念
Before diving into case studies, it is helpful to refresh the core concepts you will use repeatedly. These ideas form the economist's toolkit.
在进行案例分析之前，先复习一下你会反复使用的核心概念会很有帮助。这些理念构成了经济学家的工具箱。
| English Concept | 中文概念 | Brief Meaning |
|---|---|---|
| Scarcity | 稀缺性 | Limited resources against unlimited wants — the basic economic problem. |
| Choice | 选择 | Deciding how to use scarce resources among alternatives. |
| Opportunity cost | 机会成本 | The next best alternative given up when a choice is made. |
| Demand | 需求 | The willingness and ability to buy a good or service at different prices. |
| Supply | 供给 | The willingness and ability to produce and sell a good or service. |
| Price mechanism | 价格机制 | The system where prices adjust to balance demand and supply. |
| Incentives | 激励 | Rewards or penalties that influence people's choices. |
Familiarity with these terms is essential, but the real skill lies in recognising how they interact in a given story. For instance, a price rise might be caused by a supply shock and simultaneously change the incentive for consumers to switch to a substitute.
熟悉这些术语很重要，但真正的技巧在于识别它们在特定故事中是如何相互作用的。例如，价格上涨可能是由供给冲击引起的，同时改变了消费者转向替代品的激励。
3. Step-by-Step Approach to Analysing a Case | 案例分析的步骤
A systematic approach prevents you from missing key points. Follow these four steps whenever you tackle a case study.
系统化的方法可以防止你遗漏关键点。每次处理案例分析时，请遵循以下四个步骤。
Step 1: Identify the economic problem. Read the case carefully and underline what the decision-maker wants to achieve and what limits them. Look for clues about scarce resources, such as money, time, or raw materials.
第一步：识别经济问题。仔细阅读案例，画出决策者想要达成的目标以及限制他们的条件。寻找有关稀缺资源（如金钱、时间或原材料）的线索。
Step 2: Determine the relevant concepts. Ask yourself: does this situation involve supply and demand, opportunity cost, or incentives? Pick two or three that best fit. Avoid throwing in every concept you know.
第二步：确定相关概念。问自己：这种情况是否涉及供需、机会成本或激励？选择最贴切的两到三个概念。避免把你所知道的每个概念都扔进去。
Step 3: Apply the concepts with evidence. Explain how each concept works in the case. For example, 'The opportunity cost of choosing the school play over extra maths tutoring is the improved grade in maths that is given up.' Always link back to the details.
第三步：结合证据应用概念。解释每个概念在案例中是如何起作用的。例如，“选择学校话剧而放弃额外数学辅导的机会成本，就是放弃了的数学成绩提高。”始终要联系案例中的细节。
Step 4: Draw a conclusion or recommend a decision. Based on your analysis, state what the decision-maker should do and why. If the case asks for a prediction, explain the likely outcome using economic logic.
第四步：得出结论或提出建议。根据你的分析，说明决策者应该怎么做以及为什么。如果案例要求做出预测，就用经济逻辑解释可能的结果。
4. Case Study 1: The Ice Cream Stand Dilemma | 案例一：冰淇淋摊的困境
Imagine you own an ice cream stand at a busy beach. The summer season is short, so you must earn enough profit to last the whole year. This year, the price of sugar, a key ingredient, has doubled. Your regular customers are school children who have a limited amount of pocket money. You are considering whether to raise your ice cream price from £1.50 to £2.00 per scoop.
设想你在一个繁忙的海滩上经营一个冰淇淋摊。夏季很短，因此你必须赚取足以维持全年的利润。今年，关键原料糖的价格翻了一番。你的常客是一群零花钱有限的小学生。你正在考虑是否将每球冰淇淋的价格从1.50英镑提高到2.00英镑。
This case contains multiple economic elements. You face higher costs, meaning your profit margin is squeezed. Your customers have a budget constraint, so they react to price changes. The beach has other ice cream sellers too, creating competition. Your decision will affect quantity demanded and total revenue.
这个案例包含多个经济要素。你面临成本上升，意味着你的利润空间受到挤压。你的顾客存在预算约束，因此他们会对价格变化做出反应。海滩上还有其他冰淇淋卖家，这就产生了竞争。你的决定会影响需求量和总收入。
5. Analysing Scarcity and Choice in Case 1 | 分析案例一中的稀缺与选择
Scarcity appears in several forms here. The limited summer season means time is scarce: you cannot sell ice cream all year round. Sugar is scarce because its price has risen, reflecting either a poor harvest or increased global demand. Finally, your customers' pocket money is scarce, so they must make choices about how to spend it.
稀缺在这里以多种形式出现。短暂的夏季意味着时间是稀缺的：你无法全年销售冰淇淋。糖是稀缺的，因为其价格上涨了，这反映了收成不好或全球需求增加。最后，顾客的零花钱是稀缺的，所以他们必须就如何花钱做出选择。
Choice comes into play when you decide how to respond to the sugar price hike. You could absorb the cost and keep the price at £1.50, hoping to sell many scoops. Alternatively, you could raise the price to £2.00 and accept that some customers might stop buying. Each option uses your scarce resources (ingredients, time, and effort) in a different way.
当你决定如何应对糖价上涨时，选择就出现了。你可以自己消化成本，维持1.50英镑的价格，希望能卖出很多球。或者，你可以将价格提高到2.00英镑，并接受一些顾客可能会停止购买这一事实。每个选项都以不同的方式使用你的稀缺资源（原料、时间和精力）。
Customers also face a choice. With a fixed amount of pocket money, a higher ice cream price leaves them with less to spend on other treats, such as sweets or drinks. They must therefore decide whether the enjoyment of one extra scoop is worth giving up something else.
顾客也面临着选择。在零花钱固定的情况下，冰淇淋价格越高，他们能花在其他零食（如糖果或饮料）上的钱就越少。因此，他们必须决定多享受一球冰淇淋是否值得放弃其他东西。
6. Opportunity Cost in the Ice Cream Stand | 案例一中的机会成本
Opportunity cost is the heart of this decision. If you raise the price to £2.00, the opportunity cost is the potential loss of customers who cannot afford the higher price. You might earn a higher profit per scoop, but total revenue could fall if many customers switch to a rival stand or buy nothing.
机会成本是该决策的核心。如果你把价格提高到2.00英镑，机会成本就是可能失去那些负担不起更高价格的顾客。你每球可能赚取更高的利润，但如果许多顾客转向竞争对手的摊点或完全不买，总收入可能会下降。
If you keep the price at £1.50, the opportunity cost is the extra profit you could have made from each scoop. Since your ingredient costs have risen, your profit per scoop becomes smaller. You would need to sell many more scoops to compensate. The trade-off is between a higher profit margin and a larger customer base.
如果你维持1.50英镑的价格，机会成本就是你原本可以从每球中赚取的额外利润。由于原料成本上升，你每球的利润变得更小。你就需要卖出多得多的球数来弥补。权衡是在更高的利润率与更大的客户群之间进行的。
For the school children, the opportunity cost of buying a £2.00 ice cream might be forgoing two small bags of sweets they usually enjoy. If they value those sweets highly, they will cut back on ice cream, causing your quantity demanded to drop. Economists call this the substitution effect.
对于小学生来说，购买一个2.00英镑冰淇淋的机会成本可能是放弃他们通常享用的两小袋糖果。如果他们很看重那些糖果，就会减少购买冰淇淋，导致你的需求量下降。经济学家称此为替代效应。
7. Case Study 2: The School Canteen Price Increase | 案例二：学校食堂涨价
A secondary school decides to increase the price of a hot lunch from £2.00 to £2.50 due to rising food costs. The canteen is the only place to buy a hot meal on campus, but students are allowed to bring a packed lunch from home. In the first month after the price rise, 20% fewer students buy hot lunches. Some start bringing sandwiches, while others go to a nearby bakery during the lunch break.
一所中学决定由于食材成本上涨，将热午餐的价格从2.00英镑提高到2.50英镑。食堂是校园内唯一能买到热饭的地方，但学生可以自带盒装午餐。涨价后的第一个月，购买热午餐的学生减少了20%。一些学生开始自带三明治，另一些则在午休时间去附近的面包店。
This case sets up a classic demand-side reaction. The school canteen acts as a supplier with some market power because it is the only on-site option. However, the existence of substitutes — packed lunches and the bakery — means students are not forced to accept the higher price. The canteen manager must now reconsider the pricing strategy.
这个案例引发了典型的需求侧反应。学校食堂作为供应商，由于是校内唯一选择而拥有一定的市场力量。然而，替代品的存在——自带的盒装午餐和面包店——意味着学生并非被迫接受更高的价格。食堂经理现在必须重新考虑定价策略。
8. Demand and Supply in the Canteen Case | 食堂案例中的需求与供给
We can analyse this event using the demand and supply model. The supply of hot lunches has not changed — the canteen can still produce roughly the same number of meals. What has changed is the price, which rose from £2.00 to £2.50. According to the law of demand, when the price of a good rises, the quantity demanded falls, ceteris paribus.
我们可以用供需模型来分析这一事件。热午餐的供给没有变化——食堂仍然能生产大致相同数量的饭菜。变化的是价格，从2.00英镑涨到了2.50英镑。根据需求定律，在其他条件不变的情况下，价格上涨，需求量就会下降。
In this case, the 20% drop in quantity demanded confirms the theory. Students demonstrate that their demand for canteen food is price elastic — meaning they are quite responsive to price changes. This is because suitable substitutes (packed lunch, bakery items) are readily available. If there were no substitutes, the fall would be smaller, and demand would be inelastic.
在这个案例中，需求量下降20%证实了该理论。学生们显示出他们对食堂食物的需求是富有价格弹性的——也就是说，他们对价格变化相当敏感。这是因为合适的替代品（自带午餐、面包店食品）很容易获得。如果没有替代品，降幅会更小，需求就会是缺乏弹性的。
On a demand and supply diagram, the supply curve would be vertical or steep in the short run. The price increase is shown as a movement along the demand curve, resulting in a lower equilibrium quantity. The canteen's total revenue from lunches will likely fall, because the percentage drop in quantity demanded (20%) is greater than the percentage rise in price (25%).
在供需图中，供给曲线在短期内是垂直或陡峭的。价格上涨表现为沿着需求曲线的移动，导致均衡数量下降。食堂从午餐中获得的总收入很可能会下降，因为需求量下降的百分比（20%）大于价格上涨的百分比（25%）。
9. Evaluating the Impact on Students | 评估对学生的影响
The price rise forces students to re-evaluate their choices. A student who switches to a packed lunch avoids the £2.50 expense, but now uses time at home to prepare it. The opportunity cost of this saved money is the lost leisure time in the morning or evening. For some students, that time is highly valuable because of homework or hobbies.
涨价迫使学生重新评估他们的选择。改带盒装午餐的学生避免了2.50英镑的开销，但现在要花在家准备的时间。这笔省下来的钱的机会成本就是早晨或晚上损失的闲暇时间。对于某些学生来说，由于家庭作业或爱好，这段时间是非常宝贵的。
Those who go to the bakery face a different trade-off. The bakery may offer a pastry for £1.80, which is cheaper than the canteen, but perhaps less nutritious. Here, the opportunity cost of saving money is a potentially less balanced diet. Students must consider not just the money price, but also the quality of the meal.
那些去面包店的学生面临不同的权衡。面包店可能以1.80英镑的价格出售糕点，比食堂便宜，但可能营养不够均衡。在这里，省下钱的机会成本可能就是相对不那么均衡的饮食。学生不仅要考虑金钱价格，还要考虑饭菜的质量。
From the canteen's perspective, the drop in customers may lead to a review of portion sizes or menu variety. If they want to win back students, they could introduce a 'meal deal' that lowers the effective price per item, changing the perceived opportunity cost for students.
从食堂的角度看，顾客的减少可能导致重新评估份量大小或菜品多样性。如果想赢回学生，可以推出“套餐优惠”，降低每样物品的有效价格，从而改变学生感知到的机会成本。
10. Case Study 3: Allocating Pocket Money | 案例三：零花钱的分配
Emma receives £10 per week as pocket money. She loves reading comic books (£3 each) and also enjoys buying snacks at school (£1.50 per snack). Additionally, she wants to save £2 per week towards a new bicycle. This week, a new comic issue is released that she really wants, but she has already bought one snack and saved her £2. She has £5 remaining.
艾玛每周得到10英镑零花钱。她喜欢看漫画书（3英镑一本），也喜欢在学校买零食（1.50英镑一份）。此外，她想每周存2英镑用来买一辆新自行车。本周，一本她非常想要的新漫画发行了，但她已经买了一份零食并存了2英镑。她还剩5英镑。
This personal finance case highlights scarcity, budgeting, and opportunity cost in an everyday setting. Emma's £10 budget is a scarce resource because her wants exceed her income. She must make rational choices to maximise her satisfaction, or utility.
这个个人理财案例在日常场景中突出了稀缺性、预算约束和机会成本。艾玛的10英镑预算是一种稀缺资源，因为她的需求超过了她的收入。她必须做出理性的选择，使自己的满足感（即效用）最大化。
11. Decision-Making and Trade-offs | 决策与权衡
Emma's remaining £5 forces a trade-off. She could buy the new comic for £3, leaving £2 that she could either save extra or spend on another snack. If she buys the comic, the opportunity cost might be giving up two snacks this week, or reducing her saving beyond the planned £2. Alternatively, she could skip the comic and instead buy two snacks and keep her saving on track.
艾玛剩下的5英镑迫使她做出权衡。她可以花3英镑买新漫画，剩下2英镑既可以额外存起来，也可以再买一份零食。如果她买了漫画，机会成本可能是本周放弃两份零食，或者在计划存2英镑的基础上减少储蓄。另一种选择是，她不买漫画，而是买两份零食并照常存钱。
Economists think at the margin here. What is the additional benefit of that one comic compared with the next-best use of £3? The marginal benefit is the enjoyment of reading the story. The marginal cost is the value of the best alternative — perhaps a second snack and an extra pound saved towards the bicycle, which brings her closer to her long-term goal.
经济学家会在边际上进行思考。与对这3英镑的次优用途相比，购买这本漫画书的额外收益是什么？边际收益就是从阅读故事中获得的乐趣。边际成本则是最佳替代选择的价值——可能是一份额外的零食和额外存一英镑用于购买自行车，这能让她更接近自己的长期目标。
If Emma decides to buy the comic and skip one snack, she is weighing her short-term desire for reading against the short-term enjoyment of food. Her saving goal remains untouched, so she still invests in her future. This shows that opportunity cost does not always involve money — it involves the satisfaction given up from the next best alternative.
如果艾玛决定买漫画而放弃一份零食，她就是在用阅读的短期渴望来权衡食物的短暂享受。她的储蓄目标安然无恙，所以她仍然在为未来投资。这说明机会成本并不总是涉及金钱——它涉及的是放弃的次优选择所带来的满足感。
12. Conclusion: Becoming a Young Economist | 结语：成为小经济学家
Case studies like the ice cream stand, school canteen, and pocket money allocation help you see that economics is not just about graphs and definitions — it is about understanding people's everyday decisions. By practising the four-step approach, you train your brain to spot scarcity, evaluate trade-offs, and use opportunity cost as a lens.
像冰淇淋摊、学校食堂和零花钱分配这样的案例分析，能帮助你认识到经济学不只是图表和定义——它关乎理解人们的日常决策。通过练习四步法，你训练大脑去发现稀缺性、评估权衡，并以机会成本为透镜进行分析。
Whenever you face a new case, remember to be specific: name the scarce resource, identify who is choosing, state the alternatives, and explain what is given up. Use demand and supply when prices change, and discuss incentives when behaviour shifts. The more you practise, the more natural economic thinking becomes.
每当你面对一个新的案例时，记住要具体：说出稀缺资源的名称，确定是谁在做选择，列出各种选项，并解释放弃了什么。当价格变化时使用需求与供给，当行为改变时讨论激励。你练习得越多，经济思维就越自然。
These skills will prepare you not only for exams but for real-life money decisions. Start by analysing small choices around you — why your local shop lowers prices before closing, or why your parents compare prices before buying. You are already living in an economic world; case studies simply give you the language to describe it.
这些技能不仅能让你应对考试，还能帮你面对现实生活中的金钱决策。从分析你周围的小选择开始吧——为什么你家附近的店铺会在关门前降价，或者为什么你父母在购买前会比较价格。你已经生活在一个经济世界中；案例分析只是给了你描述它的语言。
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