📚 Cambridge Year 7 Economics Key Terms Memory Guide | 剑桥七年级经济学词汇术语速记指南
Welcome to your go-to memory toolkit for Cambridge Year 7 Economics. Mastering the language of economics is like learning the rules of a new game - once you know the key terms, everything starts to make sense. In this guide, we break down the most important vocabulary from the syllabus and attach vivid images, silly stories and simple acronyms to help them stay in your brain. Every term is defined in plain English, paired with its Chinese meaning, and followed by a memory trick you can reuse in class, in homework and in tests. Let's turn tricky words into unforgettable friends.
欢迎来到剑桥七年级经济学词汇的专属记忆工具箱。掌握经济学语言就像学习一款新游戏的规则——一旦你认识了关键术语，一切都会豁然开朗。在本指南中，我们将梳理课程中最重要的词汇，并为它们配上生动的画面、有趣的故事和简单的首字母缩略词，让它们牢牢印在你的脑海中。每个术语都会用通俗的英文解释，并配上中文含义，再附上一个可以在课堂、作业和考试中反复使用的记忆技巧。让我们把难记的词语变成难忘的朋友。
1. Needs and Wants | 需要与欲望
Every economics course starts with two simple words: needs and wants. Needs are the things a person must have in order to survive - food, water, shelter, clothing, warmth and basic health care. Wants are things that make life more enjoyable but are not essential for survival - a new game, fizzy drinks, a pair of branded trainers or a mobile phone upgrade. The key idea is that needs are limited and similar for everyone, while wants are unlimited and different for every person.
每一门经济学课程都从两个简单的词开始：需要与欲望。需要是一个人为了生存必须拥有的东西——食物、水、住所、衣服、保暖和基本医疗。欲望是让生活更愉快、但并非生存必需的东西——一款新游戏、汽水、一双名牌运动鞋，或者换一部新手机。关键点是：需要是有限的，而且对每个人都差不多；欲望却是无限的，而且因人而异。
Memory trick: 'Needs keep you breathing, wants keep you shopping.' To remember the list of needs, use the silly sentence 'Wise Foxes Sit Calmly Watching Hills' - Water, Food, Shelter, Clothes, Warmth, Health. Say it out loud three times and the list is yours.
记忆技巧：'需要让你活下去，欲望让你买不停。'要记住需要的清单，可以用一句傻句子 'Wise Foxes Sit Calmly Watching Hills'（聪明的狐狸安静地坐着看山丘）——水 Water、食物 Food、住所 Shelter、衣服 Clothes、保暖 Warmth、健康 Health。大声念三遍，这张清单就是你的了。
Exam tip: If a question asks you to 'explain the difference between needs and wants', always give one definition plus one clear example for each term. Definitions alone rarely earn full marks.
考试提示：如果题目要求'解释需要与欲望的区别'，一定要为每个术语写一个定义加一个清晰的例子。只写定义通常拿不到满分。
2. Scarcity and Choice | 稀缺性与选择
Scarcity means that there are not enough resources to satisfy all our wants. It is the reason we must make choices every day. When you only have £2 and want both chocolate and a comic, you face scarcity. Choice is the decision you make about how to use your limited money or time. Picture a 'scarce city' where everyone is thirsty but there is just one water fountain - you must choose to queue or walk away. Scarcity is the basic economic problem that sits at the centre of the whole subject.
稀缺性意味着没有足够的资源来满足我们所有的欲望。这正是我们每天都必须做出选择的原因。当你只有 2 英镑，却既想要巧克力又想要漫画书时，你就面临着稀缺性。选择就是你决定如何使用有限金钱或时间的行为。想象一座'稀缺之城'，人人都口渴，却只有一个饮水机——你必须选择是排队等候还是走开。稀缺性是整个学科的核心，即基本经济问题。
Unlimited wants + Limited resources → Scarcity → Choice → Opportunity cost
Memory trick: scarcity is not the same as a shortage. A shortage happens when there is not enough of something for a short time (the shop has sold out of bread today). Scarcity is permanent and affects everyone, everywhere, forever. Link the two ideas with the phrase 'Scarcity forces Choice' - both words begin with the sound 's-k', so they travel together in your memory.
记忆技巧：稀缺性不等于短缺。短缺是指某样东西短时间内不够（今天面包卖完了）。稀缺性则是永久的，影响每个人、每个地方、任何时候。用一句话把两个概念连起来：'Scarcity forces Choice'（稀缺迫使人选择）——两个词都以 's-k' 音开头，所以在记忆里它们总是一起出现。
A second useful image: think of a school canteen with 300 students and only 100 sandwiches. The sandwiches are scarce, so the school must choose a rule - first come, first served, or one per class. Every rationing rule is really a choice.
再来一个有用的画面：想象学校食堂有 300 名学生，却只有 100 个三明治。三明治是稀缺的，所以学校必须选一个规则——先到先得，还是一个班一个。每一条分配规则本质上都是一个选择。
3. Opportunity Cost | 机会成本
Opportunity cost is the value of the next best alternative that you give up when you make a choice. It is the most important phrase in Year 7 economics, because it turns every decision into a trade-off. If you spend your £2 on a comic, the opportunity cost is the chocolate bar you did not buy. If you revise economics for an hour, the opportunity cost is the hour of football you did not play. Notice that opportunity cost is never money alone - it can be time, effort or enjoyment.
机会成本是指当你做出选择时，所放弃的次优选项的价值。它是七年级经济学中最重要的短语，因为它把每一个决定都变成了取舍。如果你把 2 英镑花在漫画书上，机会成本就是那块你没买的巧克力。如果你花一小时复习经济学，机会成本就是你没踢的那一小时足球。注意，机会成本从来不只是钱——它也可以是时间、精力或乐趣。
Opportunity cost = value of the next best alternative given up
Memory trick: 'OC = the Next Best Choice' s: the finger you put down is the opportunity cost. Always describe it as a full sentence: 'he opportunity cost of buying the comic was the chocolate bar I could have bought instead.'
记忆技巧：'OC = the Next Best Choice'（机会成本＝次优选择）。伸出两根手指：放下的那根就是机会成本。描述时永远写成完整句子：'买漫画书的机会成本，是我本来可以买的那块巧克力。'
| Choice made | Opportunity cost |
| 政府建一所新医院 | 用同样资金本可修建的那条新铁路 |
| Staying up late to finish homework | The sleep you gave up |
| A country using land for housing | The farm produce that land could have grown |
4. Factors of Production | 生产要素
Factors of production are the resources used to make goods and provide services. There are four of them: land (all natural resources, including water, minerals and soil), labour (the human effort, both physical and mental, used in production), capital (man-made goods used to make other goods, such as machines, tools and factories) and enterprise (the risk-taking and decision-making done by the person who starts and runs a business). Each factor earns a reward.
生产要素是指用来生产商品和提供服务的资源，共有四种：土地（所有自然资源，包括水、矿产和土壤）、劳动（生产中投入的人体努力，包括体力与脑力）、资本（用于生产其他商品的人造物品，如机器、工具和工厂）以及企业家才能（创办和经营企业的人所承担的冒险与决策）。每种要素都会获得相应的报酬。
Land → rent | Labour → wages | Capital → interest | Enterprise → profit
Memory trick: use the word 'CELL' - Capital, Enterprise, Land, Labour. A cell is the smallest building block of life, and CELL is the smallest building block of production. To remember the rewards, think of a landlord who rents land, a worker who earns wages, a bank that charges interest and an entrepreneur who keeps the profit.
记忆技巧：记住单词 'CELL'——Capital 资本、Enterprise 企业家才能、Land 土地、Labour 劳动。细胞是生命的最小构成单位，而 CELL 是生产的最小构成单位。记住报酬时，可以想：地主收租金 rent、工人拿工资 wages、银行收利息 interest、企业家赚利润 profit。
Common mistake: money in a savings account is not capital in this technical sense. Capital means the tools and machines used in production. Watch out for this in multiple-choice questions.
常见错误：存在银行里的钱在经济学意义上不算资本。资本指的是用于生产的工具和机器。做选择题时要特别小心这一点。
5. Goods and Services | 商品与服务
Goods are physical, tangible items that you can touch, store and carry home - a textbook, a bicycle, a loaf of bread. Services are intangible actions done for you by someone else - a haircut, a bus journey, a dentist's check-up. Economists also divide goods into free goods, which are unlimited and cost nothing to consume, such as air and sunlight, and economic goods, which are scarce and must be paid for.
商品是有形的、可以触摸、储存并带回家的实物——一本教科书、一辆自行车、一条面包。服务是别人为你完成的、无形的行为——理发、坐公交车、看牙医。经济学家还把物品分为自由物品，即无限供应、消费时无需付费的，例如空气和阳光；以及经济物品，即稀缺、必须付费购买的物品。
Memory trick: 'Goods you can grab, services you can feel.' If you can drop it on your foot, it is a good. If someone has to do it for you, it is a service. For the free good test, ask yourself: 'Would anyone ever pay for it?' Nobody buys air, so air is a free good - but bottled water is an economic good, because the bottle costs money to produce.
记忆技巧：'Goods you can grab, services you can feel.'（商品抓得住，服务感受得到。）如果它能砸到你的脚，它就是商品。如果必须有人替你做，它就是服务。判断自由物品的方法是问自己：'会有人为它付钱吗？'没人买空气，所以空气是自由物品；但瓶装水是经济物品，因为生产瓶子要花钱。
Consumer goods are bought by households for final use; capital goods are bought by businesses to help produce other goods. A pizza is a consumer good, but the oven that baked it is a capital good.
消费品由家庭购买并最终使用；资本品由企业购买，用来帮助生产其他商品。披萨是消费品，而烤它的烤箱是资本品。
6. Producers, Consumers and Specialisation | 生产者、消费者与专业化
A producer is a person or business that makes goods or provides services. A consumer is a person who buys and uses goods and services to satisfy their wants. Specialisation means concentrating on one particular job, product or skill instead of trying to do everything. When specialisation happens inside a factory - one worker cuts, one worker sews, one worker packs - economists call it the division of labour.
生产者是制造商品或提供服务的个人或企业。消费者是购买并使用商品和服务来满足自身欲望的人。专业化是指专注于某一项工作、产品或技能，而不是什么都做。当专业化发生在工厂内部时——一个人裁剪、一个人缝纫、一个人包装——经济学家称之为分工。
Why does specialisation help? It raises productivity, because workers repeat one task and become faster and more skilled. It saves time, because workers do not keep switching tools. It also makes machinery easier to use. But there are disadvantages: work can become boring and repetitive, and if one part of the chain stops, the whole production line stops. Producers and consumers are also interdependent - producers need consumers to buy their output, and consumers need producers for the things they cannot make themselves.
专业化为什么有帮助？它提高生产率，因为工人重复同一项任务，会变得更快、更熟练。它节省时间，因为工人不必反复更换工具。它也让机器更容易使用。但也有缺点：工作可能变得枯燥重复；而且只要链条上的一个环节停止，整条生产线都会停下来。生产者与消费者也是相互依存的——生产者需要消费者购买产品，消费者也需要生产者提供自己无法制造的东西。
Memory trick: 'Do One Thing Well' - the initials spell DOTW, which you can picture as a dot in the middle of a big web: one small point, connected to everything else. That is specialisation inside an interdependent economy.
记忆技巧：'Do One Thing Well'（把一件事做到最好）——首字母 DOTW，可以想象成一张大网中央的一个点：一个很小的位置，却连接着所有其他部分。这就是相互依存经济中的专业化。
7. Barter, Money and Exchange | 以物易物、货币与交换
Exchange means trading something you have for something you want. Before money existed, people used barter - swapping goods and services directly, for example trading three eggs for one loaf of bread. Barter has a serious problem called the double coincidence of wants: both people must want exactly what the other person has, at exactly the same time. That is very unlikely, which is why money was invented.
交换是指用你拥有的东西去换取你想要的东西。在货币出现之前，人们使用以物易物——直接交换商品和服务，例如用三个鸡蛋换一条面包。以物易物有一个严重的问题，叫做需求的双重巧合：双方必须恰好同时想要对方所拥有的东西。这种可能性非常低，所以货币被发明了出来。
Money = medium of exchange + unit of account + store of value + means of deferred payment
Memory trick: remember the four functions of money with the silly story 'My Uncle Sells Doughnuts' - Medium of exchange, Unit of account, Store of value, Deferred payment. If you can remember a doughnut-selling uncle, you can remember all four functions.
记忆技巧：用一句傻故事记住货币的四大职能：'My Uncle Sells Doughnuts'（我叔叔卖甜甜圈）——交换媒介 Medium of exchange、计价单位 Unit of account、价值储藏 Store of value、延期支付手段 Deferred payment。只要记住这位卖甜甜圈的叔叔，四个职能就全在脑子里了。
Note that money must be portable, durable, divisible, hard to counterfeit and generally accepted. Economics questions often ask why a specific item, such as seashells or gold, worked well or badly as money - answer using those five qualities.
注意，货币必须具备便携、耐用、可分割、难以伪造和普遍被接受等特性。经济学习题常问某种物品（如贝壳或黄金）作为货币好在哪里、差在哪里——回答时用上这五个特性。
8. Demand, Supply and Markets | 需求、供给与市场
A market is any place or system where buyers and sellers meet to exchange goods and services. Markets can be local, like a Saturday street market; national, like a country's supermarket chains; or global, like the market for oil. Demand is the quantity of a good that consumers are willing and able to buy at each price. Supply is the quantity that producers are willing and able to sell at each price.
市场是买卖双方相遇并交换商品和服务的任何场所或系统。市场可以是本地的，比如周六的街头集市；可以是全国的，比如一个国家的连锁超市；也可以是全球性的，比如石油市场。需求是消费者在每个价格下愿意并且能够购买的数量。供给是生产者在每个价格下愿意并且能够出售的数量。
The law of demand: when the price of a good rises, the quantity demanded usually falls, and when the price falls, the quantity demanded usually rises. The law of supply works the other way: a higher price gives producers an incentive to supply more. Demand and supply together decide what is produced, how much is produced and who gets it.
需求定律：当商品价格上涨时，需求量通常下降；价格下降时，需求量通常上升。供给定律正好相反：更高的价格会激励生产者提供更多。需求与供给共同决定了生产什么、生产多少以及谁来获得这些产品。
Memory trick: 'D for Down, S for Sky.' Demand slopes down towards the ground; supply slopes up towards the sky. Sketch the two lines side by side once, in your own handwriting, and your hand will remember the shape even when your brain is nervous in a test.
记忆技巧：'D for Down, S for Sky.'（D 朝下，S 朝天。）需求曲线向下斜，供给曲线向上斜。亲手把这两条线并排画一次，考试紧张时你的手也会记得它们的形状。
9. Price and Equilibrium | 价格与均衡
Price is the amount of money a buyer pays and a seller receives for one unit of a good or service. Price carries information: it tells consumers whether something is cheap or expensive, and it tells producers whether it is worth making more. Where the demand curve crosses the supply curve, the market is in equilibrium - the price at which the quantity consumers want to buy equals the quantity producers want to sell.
价格是买方为一单位商品或服务支付、卖方收到的货币金额。价格携带信息：它告诉消费者某样东西是便宜还是昂贵，也告诉生产者是否值得多生产。当需求曲线与供给曲线相交时，市场处于均衡状态——在这个价格下，消费者想买的数量恰好等于生产者想卖的数量。
If the price is above equilibrium, there is a surplus: sellers cannot shift all their stock, so they cut prices. If the price is below equilibrium, there is a shortage: buyers want more than is available, so prices are pushed up. Prices therefore act like a signal and an incentive, moving the market back towards equilibrium.
如果价格高于均衡价格，就会出现过剩：卖家卖不掉全部存货，于是降价。如果价格低于均衡价格，就会出现短缺：买家想买的数量超过供应量，于是价格被推高。因此价格既像信号，又像激励，把市场推回均衡状态。
Total revenue = Price × Quantity sold | Profit = Total revenue − Total cost
Memory trick: draw an X. Where the two lines cross, prices stop being pushed up or down - that is 'X marks the equilibrium spot'. For calculations, remember that revenue is a multiplication, and profit is what is left after costs are subtracted.
记忆技巧：画一个大 X。两条线交叉的地方，价格不再被推高或压低——这就是 'X marks the equilibrium spot'（X 标记均衡点）。做计算题时记住：收入是乘法，利润是扣掉成本之后剩下的部分。
10. Income, Spending and Saving | 收入、支出与储蓄
Income is the money a person receives, usually in exchange for work, but also from interest, rent or gifts. Spending is the money used to buy goods and services. Saving is the part of income that is not spent. For most households the three are linked by a simple rule: income minus spending equals saving. If spending is greater than income, a person must borrow, and borrowing usually means paying interest later.
收入是一个人获得的货币，通常来自工作，也可以来自利息、租金或赠予。支出是用于购买商品和服务的钱。储蓄是没有被花掉的那部分收入。对大多数家庭来说，三者由一个简单规则连在一起：收入减去支出等于储蓄。如果支出大于收入，就必须借贷，而借贷通常意味着以后要支付利息。
Saving = Income − Spending
A budget is a plan showing expected income and expected spending over a period, such as a week or a month. Budgets help people avoid debt and reach goals. Interest is the price of borrowing money, and it is also the reward for saving money in a bank. Interest rates are usually given as a percentage per year, so you can calculate simple interest by multiplying the amount by the rate.
预算是显示某一时期（如一周或一个月）预期收入与预期支出的计划。预算能帮助人们避免负债并实现目标。利息是借钱的价格，也是把钱存进银行所获得的报酬。利率通常以每年百分比表示，因此可以用本金乘以利率来计算单利。
Memory trick: 'Pay Yourself First.' Imagine a payslip where the very first envelope is labelled SAVING, and only then does money go to spending. For interest, remember 'I for Interest, I for In and I for Incentive' - interest goes into your account if you save, and out of your pocket if you borrow.
记忆技巧：'Pay Yourself First.'（先给自己付钱。）想象一张工资单，第一个信封上写着 SAVING（储蓄），之后剩下的钱才用于支出。关于利息，记住 'I for Interest, I for In, I for Incentive'——存钱时利息流进你的账户，借钱时利息流出你的口袋。
11. Government, Taxes and Public Goods | 政府、税收与公共品
The government plays a large role in an economy. It collects taxes, spends money on public services, makes laws and sometimes provides goods directly. A tax is a compulsory payment to the government. Examples include income tax, which is paid on the money people earn, and VAT, which is added to the price of many goods and services. Taxes are the main source of government revenue.
政府在经济中扮演着重要角色。它征税、把钱花在公共服务上、制定法律，有时还直接提供商品。税收是向政府缴纳的强制性付款。例子包括所得税（就人们赚到的钱缴纳）和增值税（加在许多商品和服务的价格上）。税收是政府收入的主要来源。
A public good is a good that would not be provided by private firms in the right amount, because it is hard to charge for it and one person's use does not reduce another person's use. Street lighting and national defence are classic examples. The government also builds roads, runs schools and hospitals, and pays benefits to people who need support. Sometimes it gives a subsidy, which is a payment to a producer to lower costs and encourage more
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