📚 Case Study Practical Exercises | 案例分析实战演练
Case studies bring economics to life. By examining real-world scenarios, you can practise applying concepts such as scarcity, opportunity cost, supply and demand, and market structures. This article presents a series of practical exercises designed for Year 7 AQA Economics students. Each case is followed by clear explanations to help you master the key ideas.
案例分析让经济学变得生动。通过研究现实场景，你可以练习运用稀缺性、机会成本、供给与需求以及市场结构等概念。本文为 Year 7 AQA 经济学生设计了一系列实战练习，每个案例都有清晰的解释，帮助你掌握核心思想。
1. Scarcity in Action: Tom’s Lemonade Stand | 稀缺性实战：汤姆的柠檬水小摊
Tom wants to set up a lemonade stand after school. He has exactly £5 in his pocket and only one hour before dinner. This situation captures the economic problem of scarcity – his resources (money and time) are limited while his wants (to sell as much lemonade as possible) are unlimited.
汤姆想在放学后摆一个柠檬水小摊。他口袋里只有恰好 5 英镑，并且晚饭前只有一小时。这种情况体现了经济学的稀缺性问题——他的资源（金钱和时间）有限，而他的欲望（尽可能多卖柠檬水）是无限的。
With £5, Tom must decide how to allocate his money. He can buy lemons for £2, sugar for £1, and a cardboard sign for £2. If he buys all three, he spends £5 exactly. But is that the best use? Perhaps he could use a free sign and spend the extra £2 on more lemons. Every choice involves a trade-off, which leads to the next core concept: opportunity cost.
有了 5 英镑，汤姆必须决定如何分配这笔钱。他可以花 2 英镑买柠檬、1 英镑买糖和 2 英镑买一块硬纸板招牌。如果全部购买，正好花光所有钱。但这是最好的用途吗？也许他可以用免费的招牌，把额外的 2 英镑花在更多柠檬上。每一个选择都涉及权衡，这就引出了下一个核心概念：机会成本。
The opportunity cost of buying the sign is the next best alternative given up – in this case, two extra bags of lemons that could have produced more lemonade and earned more revenue. Recognising opportunity cost helps Tom think like an economist.
购买招牌的机会成本是放弃的次优替代方案——在这里是两袋额外的柠檬，它们本可以生产更多柠檬水并带来更多收入。认识到机会成本有助于汤姆像经济学家一样思考。
- Scarcity means not having enough resources to satisfy all needs and wants.
- 稀缺性意味着没有足够的资源来满足所有需要和欲望。
- Trade-offs force us to choose between alternatives.
- 权衡迫使我们在不同选项之间做出选择。
- Opportunity cost is the value of the next best option sacrificed.
- 机会成本是被牺牲掉的次优选择的价值。
2. Opportunity Cost: Choosing a Hobby | 机会成本：选择爱好
Sarah loves both playing football and painting. Her local clubs meet at the same time on Saturday mornings, so she can only join one. After much thought, she chooses football. The opportunity cost of this decision is the enjoyment and skill development she would have gained from painting.
莎拉既喜欢踢足球又喜欢画画。她当地的俱乐部都在周六上午同一时间活动，因此她只能参加一个。深思熟虑后，她选择了足球。这个决策的机会成本是她本可以从画画中获得的乐趣和技能发展。
This simple scenario shows that opportunity cost is not always about money. It can be the loss of time, happiness, or personal growth. Sarah’s choice also reveals her preferences – she values football more. In economics, our choices reflect what we value most given our limited resources.
这个简单的场景表明，机会成本并不总是与金钱有关。它可以是时间、快乐或个人成长的损失。莎拉的选择也显示了她的偏好——她更看重足球。在经济学中，我们的选择反映了在给定有限资源的情况下我们最看重的东西。
When you make a decision, always ask: ‘What am I giving up?’ The answer is your opportunity cost. Governments and businesses use the same logic when allocating budgets.
当你做决定时，一定要问自己：“我放弃了什么？”答案就是你的机会成本。政府和企业分配预算时也使用同样的逻辑。
3. Factors of Production: Baking Cookies | 生产要素：烤饼干
A local bakery makes delicious cookies. Let us identify the four factors of production involved. First, land: the wheat for flour, sugar cane, and water are natural resources. Second, labour: the baker’s physical and mental effort to mix, bake and pack. Third, capital: the industrial oven, mixing bowls and delivery van. Fourth, enterprise: the owner who brings the other factors together, takes risks and innovates with new recipes.
当地一家面包店制作美味的饼干。我们来识别其中涉及的四种生产要素。第一，土地：用于面粉的小麦、甘蔗和水都是自然资源。第二，劳动力：面包师混合、烘焙和包装的体力和脑力劳动。第三，资本：工业烤箱、搅拌碗和送货车。第四，企业：将其他要素组合在一起、承担风险并创新新配方的店主。
All factors work together. Without land, there are no ingredients; without labour, the dough remains unmixed; without capital, production is slow; and without enterprise, nobody organises the business. The reward for each factor is also different: land earns rent, labour earns wages, capital earns interest, and enterprise earns profit.
所有要素协同工作。没有土地就没有原料；没有劳动力面团就不会被混合；没有资本生产就会缓慢；没有企业就没有人组织经营。每种要素的回报也不同：土地获得地租，劳动获得工资，资本获得利息，企业获得利润。
Understanding these factors helps you see how everything in an economy is connected. Next time you eat a cookie, think about who and what made it possible.
理解这些要素有助于你看到经济中万物如何相连。下次你吃饼干的时候，想想是谁以及什么使它成为可能。
4. Demand and Supply: Concert Tickets | 需求与供给：音乐会门票
A famous K-pop band announces a concert in London. The venue has only 5,000 seats. Over 50,000 fans try to buy tickets on the release day. This is a textbook case of high demand and fixed supply. The result? Ticket prices soar on resale websites because the quantity demanded far exceeds the quantity supplied at the original price.
一支著名的 K-pop 乐队宣布在伦敦举办演唱会。场馆只有 5,000 个座位。超过 50,000 名粉丝在发售日抢购门票。这就是高需求与固定供给的教科书案例。结果呢？门票在转售网站上价格飙升，因为在原价下需求量远超供给量。
In economics, the law of demand states that as price rises, quantity demanded usually falls, and vice versa – but here passion pushes demand to extreme. The law of supply shows that at higher prices, producers wish to offer more; but in the short term, the number of seats is fixed. This imbalance creates a shortage, allowing ticket scalpers to charge higher prices.
在经济学中，需求定律指出，当价格上升时，需求量通常会下降，反之亦然——但在这里，热情将需求推向极致。供给定律表明，在价格更高时，生产者愿意提供更多；但短期内，座位数量是固定的。这种不平衡造成了短缺，使票贩子能够收取更高的价格。
When the market cannot adjust quickly, we see scarcity in action. The high price acts as a signal to the band to consider larger venues next time. Price is a powerful messenger in a market economy.
当市场无法快速调整时，我们就看到了稀缺性在起作用。高价向乐队发出信号，提示他们下次考虑更大的场馆。在市场经济中，价格是一个强大的信使。
5. Price Mechanism: Smartphone Sale | 价格机制：智能手机折扣
An electronics store reduces the price of a popular smartphone from £600 to £450. Shoppers rush to buy, and stocks run low. Here, the lower price signals consumers to buy more. The shop notices the trend and orders more units from the supplier, while the manufacturer boosts production. This self-adjusting chain is the price mechanism at work.
一家电器店将一款畅销智能手机的价格从 600 英镑降至 450 英镑。购物者蜂拥抢购，库存很快见底。在这里，较低的价格向消费者发出了多买的信号。商店注意到这一趋势，向供应商追加订单，而制造商则增加了产量。这个自我调整的链条就是价格机制在起作用。
The price mechanism has three functions: signalling（发送信号）, incentive（激励） and rationing（配给）. The sale price signals consumers that the phone is cheaper, which incentivises them to buy. As stocks fall, the lower availability rations the remaining phones to those willing to pay quickly. Meanwhile, higher demand incentivises the producer to allocate more resources to this phone model.
价格机制有三个功能：发送信号、激励和配给。折扣价格向消费者发出手机更便宜的信号，激励他们购买。随着库存下降，低可获得性将剩余的手机配给给愿意迅速付款的人。同时，更高的需求激励生产者将更多资源分配给这款手机。
Without any central planner, the market solves the fundamental questions of what, how and for whom to produce. The humble sale tag is a real-world display of economic coordination.
无需任何中央计划者，市场就解决了生产什么、如何生产和为谁生产的基本问题。一张小小的打折牌就是经济协调的真实展现。
6. Market Structures: Compare Two Shops | 市场结构：比较两家商店
On the same high street, a large chain supermarket competes with a small family-run convenience store. The supermarket buys in bulk and can negotiate lower wholesale prices, so it sells milk at £0.90 per litre. The independent shop, with smaller volumes, pays more and must charge £1.10. This difference reflects market power and competition.
在同一个商业街上，一家大型连锁超市与一家小型家庭便利店竞争。超市批量采购，可以谈判获得更低的批发价，因此牛奶售价为每升 0.90 英镑。独立小店由于进货量小，成本更高，必须卖 1.10 英镑。这种差异反映了市场力量和竞争程度。
The supermarket operates in a structure closer to monopolistic competition or even oligopoly locally, with many product lines but huge scale. The small shop is more like a perfect competitor in some respects but relies on convenience and personal service to attract customers who value proximity over price.
超市的运营结构更接近垄断竞争甚至地方寡头，产品线多，规模巨大。小店在某些方面更像完全竞争者，但依赖便利性和人情服务来吸引那些看重地理位置而非价格的顾客。
Consumers benefit from choice. You might pop into the small shop for a quick snack, accepting the higher price, or walk further to the supermarket for a weekly shop to save money. Both shops fulfil different needs, showing that markets can have diverse structures that coexist.
消费者从选择中受益。你可能会为了快速买零食而走进小店，接受较高的价格，或者为了每周采购省钱而多走几步去超市。两家店满足不同的需求，这表明市场可以拥有多样并存的结构。
7. Specialisation and Trade: School Canteen | 专业化与贸易：学校食堂
In your school canteen, staff specialise in cooking, serving, and cleaning. They do not also teach lessons or fix the plumbing – that would be inefficient. This division of labour allows each worker to become faster and more skilled in their specific task, increasing overall productivity.
在你们学校食堂，工作人员专门从事烹饪、服务和清洁工作。他们不同时去教书或修水管——那样效率会很低。这种劳动分工让每个工人在其特定任务上变得更熟练、更高效，从而提高了整体生产力。
Specialisation also applies to students and teachers. Students specialise in learning; teachers specialise in delivering knowledge. The school then acts as a mini-economy where everyone exchanges their specialised services. Cash may not change hands directly, but trade occurs: the school provides facilities and teaching in return for future contributions to society.
专业化也适用于学生和老师。学生专注于学习，老师专注于传授知识。学校便像一个微型经济体，每个人都在交换他们专业化的服务。现金也许不会直接易手，但交易确实发生：学校提供设施和教学，以换取对社会的未来贡献。
The benefits of specialisation are huge, but it also creates interdependence. If a key cook calls in sick, the canteen struggles. Economies must balance the gains from specialisation with the need for resilience.
专业化的好处巨大，但它也造成了相互依赖。如果关键厨师请病假，食堂就会陷入困境。经济体必须在专业化的收益与韧性的需求之间取得平衡。
8. Budgeting: Saving for a Bike | 预算：存钱买自行车
Jack receives £5 pocket money each week. He dreams of buying a mountain bike costing £100. Without a plan, he might spend all his money on sweets and apps, delaying his goal indefinitely. By creating a simple budget, Jack can track income and expenses, and decide how much to save each week.
杰克每周收到 5 英镑零花钱。他梦想买一辆价值 100 英镑的山地自行车。没有计划的话，他可能把钱都花在糖果和应用程序上，无限推迟目标。通过制定一个简单的预算，杰克可以跟踪收入和支出，并决定每周存多少钱。
If Jack saves the full £5 each week, he reaches £100 in 20 weeks. But if he still wants a treat, he might save £3 and spend £2, extending the wait to about 34 weeks. This trade-off illustrates opportunity cost: the treat today means waiting longer for the bike.
如果杰克每周存下全部 5 英镑，他将在 20 周后达到 100 英镑。但如果他还想享受一点零食，他可能存 3 英镑、花 2 英镑，那么等待时间将延长至大约 34 周。这个权衡说明了机会成本：今天的零食意味着为自行车等待更久。
Budgeting is a fundamental economic skill. It forces you to prioritise needs over wants and to understand that every financial decision has a future consequence. Governments and businesses use budgets on a huge scale, but the logic is the same.
预算是一项基本的经济技能。它迫使你分清需要和欲望的优先级，并理解每个财务决策都会对未来产生影响。政府和企业大规模使用预算，但逻辑相同。
9. Economic Decisions: Family Holiday | 经济决策：家庭假期
The Ahmed family is planning a summer holiday. They have a limited budget of £1,200 and must choose between a beach resort in Spain or a camping trip in Wales. Both options bring joy, but they must evaluate costs, travel time, and the experiences offered. This is a classic economic decision-making problem.
艾哈迈德一家正在计划暑假度假。他们的预算有限，为 1,200 英镑，必须在西班牙的海滨度假村和威尔士的露营旅行之间做出选择。两个选项都带来快乐，但必须评估费用、旅行时间和提供的体验。这是一个经典的经济决策问题。
Using a cost-benefit analysis, the family lists pros and cons. Spain is warm and relaxing but more expensive and involves flights. Wales is cheaper and closer, allowing more activities with leftover money. The opportunity cost of choosing Spain is the camping adventures and extra savings; choosing Wales costs the sunshine and pools.
通过成本效益分析，这家人列出了利弊。西班牙温暖、放松，但更贵且涉及机票。威尔士更便宜、更近，剩余的钱可以用于更多活动。选择西班牙的机会成本是露营冒险和额外的储蓄；选择威尔士则牺牲了阳光和泳池。
In the end, they pick Wales and use the saved money for a weekend city break later. This demonstrates how rational choices maximise satisfaction given constraints. All economic agents – households, firms, governments – go through a similar thought process.
最终，他们选择了威尔士，并把省下的钱用于之后的城市周末游。这展示了理性选择如何在约束下最大化满足感。所有经济主体——家庭、企业、政府——都经历类似的思考过程。
10. Externalities: Park Cleanup | 外部性：公园清理
The community park has become littered because some visitors do not use bins. This creates a negative externality: a cost imposed on others who suffer from an unclean environment. The local council organises a volunteer cleanup day. Volunteers gain nothing in cash, but the community enjoys a cleaner park – a positive externality.
社区公园因部分游客不用垃圾桶而变得垃圾成堆。这产生了一种负外部性：强加给其他人的成本，使他们承受肮脏的环境。当地议会组织了一次志愿清理日。志愿者没有获得任何现金回报，但社区享有了更清洁的公园——一种正外部性。
In this case, the private cost of littering to the litterer is near zero, but the social cost is high. When private costs and social costs diverge, markets fail to allocate resources efficiently. The volunteer cleanup is a simple solution, but often governments intervene with fines or education campaigns to correct externalities.
在这个案例中，乱扔垃圾者的私人成本接近于零，但社会成本却很高。当私人成本与社会成本出现分歧时，市场无法有效配置资源。志愿清理是一种简单的解决方案，但政府通常会通过罚款或教育宣传来纠正外部性。
Externalities are everywhere: pollution from factories is negative, while bees kept for honey pollinate nearby crops and create positive externalities for farmers. Recognising them helps us design better policies.
外部性无处不在：工厂的污染是负外部性，而养蜂采蜜的蜜蜂为附近作物授粉，则为农民创造了正外部性。认识到外部性有助于我们设计更好的政策。
11. Case Study: The Local Supermarket | 综合案例：本地超市
Let us bring many concepts together through a single case: a large supermarket in a medium-sized town. The supermarket must decide what products to stock, how to price them, how many staff to hire, and how to deal with competition from a discount store nearby. Every decision involves the core economic principles we have studied.
让我们通过一个综合案例把许多概念串联起来：一座中等城镇的一家大型超市。该超市必须决定进什么货、如何定价、雇用多少员工，以及如何应对附近折扣店的竞争。每一个决策都涉及我们学过的核心经济原理。
Demand and supply determine the prices of fresh bread and seasonal fruits. The price mechanism signals to the manager when to discount near-expiry items. Scarcity appears during supply chain disruptions, pushing prices up. The supermarket uses specialisation: bakers bake, cashiers check out, and the entrepreneur-coordinator oversees strategy.
需求和供给决定了新鲜面包和时令水果的价格。价格机制向经理发出信号，告知何时对临期商品打折。供应链中断时出现稀缺性，推高价格。超市运用专业化：面包师烤面包，收银员结账，企业协调者监督战略。
Opportunity cost is considered daily: shelf space given to one brand cannot be used for another. The store also manages externalities by charging for plastic bags to reduce litter. Finally, the supermarket’s budget allocates money between wages, electricity, and stock – just like Jack saving for his bike.
机会成本每天都在被考虑：货架空间给了某个品牌，就无法用于另一个品牌。超市还通过塑料袋收费来管理外部性，减少垃圾。最后，超市的预算在工资、电费和库存之间分配资金——就像杰克存钱买自行车一样。
This case shows that economics is not a collection of disconnected theories but a toolkit for understanding everyday life. By applying the concepts to a familiar setting, you turn into a thoughtful observer of the economy.
这个案例表明，经济学不是互不相干理论的集合，而是理解日常生活的工具包。通过将概念应用到熟悉的环境中，你会变成一个有思想的经济观察者。
12. Review and Reflection | 复习与反思
Throughout these exercises, you have practised identifying scarcity, measuring opportunity cost, analysing markets, and evaluating economic decisions. Each small case study reinforces the idea that economics begins with observing the world around you critically.
通过这些练习，你已经练习了识别稀缺性、衡量机会成本、分析市场和评估经济决策。每个小案例研究都强化了这样一个观点：经济学始于批判性地观察你周围的世界。
Now it is your turn. Find a simple economic choice in your own life – perhaps choosing between two snacks, or a shop changing its prices. Write down the scenario, identify the economic principles involved, and share your findings. The best way to learn economics is to do economics.
现在轮到你了。在你自己的生活中找一个简单的经济选择——也许是在两种零食之间做选择，或者某家商店改变了价格。写下这个场景，识别涉及的经济原理，并分享你的发现。学习经济学的最佳方式就是去实践经济学。
Keep asking questions, build your economic vocabulary, and remember that every choice has a cost and every market a story. With these case studies as your guide, you are well prepared for your AQA course and beyond.
持续提问，积累你的经济学词汇，并记住每一个选择都有成本，每一个市场都有一个故事。以这些案例研究为指引，你已为 AQA 课程及未来做好了充分准备。
Published by TutorHao | Economics Revision Series | aleveler.com
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