📚 Year 9 Cambridge Economics: Key Terms Memorisation Guide | Year 9剑桥经济：词汇术语速记指南
Mastering economics starts with understanding its language. For Year 9 Cambridge students, memorising terms such as scarcity, opportunity cost, and elasticity can feel overwhelming. This guide turns vocabulary into simple, memorable hooks using acronyms, stories, and visual tricks. Each term is explained and then linked to a quick memory device so you can instantly recall it in class and exams.
学好经济学从理解它的语言开始。对于Year 9剑桥学生来说，记住稀缺性、机会成本、弹性等术语可能令人望而生畏。本指南将词汇转化为简单的速记钩子——缩略词、故事和视觉技巧。每个术语先解释，再配上一个快速记忆装置，让你在课堂和考试中瞬间想起。
1. Scarcity and the Basic Economic Problem | 稀缺性与基本经济问题
Scarcity is the fundamental economic problem: limited resources cannot satisfy unlimited human wants. Because of scarcity, every society must decide what to produce, how to produce it, and for whom to produce. This trio of questions is the core of the basic economic problem.
稀缺性是基本的经济问题：有限的资源无法满足无限的人类欲望。由于稀缺性，每个社会都必须决定生产什么、如何生产以及为谁生产。这三位一体的问题是基本经济问题的核心。
Memory hook: Picture a SCARCE slice of pizza – Society Cannot Avoid Resource Choices Ever. The smaller the pizza, the harder the choices.
记忆钩子：想象一块SCARCE（稀缺）的比萨——Society（社会）Cannot（无法）Avoid（避免）Resource（资源）Choices（选择）Ever（永远）。比萨越小，选择就越艰难。
2. Needs, Wants and Opportunity Cost | 需求、欲望与机会成本
Needs are essentials for survival, such as food, water, and shelter. Wants are desires that are not necessary for survival, like a new smartphone. Opportunity cost is the next best alternative forgone when a choice is made.
需求是生存必需品，例如食物、水、住所。欲望是超出生存所需的渴望，比如新款手机。机会成本是做出选择时所放弃的次优替代品。
Memory hook: Think of NEEDS as 'Never Ending Essentials for Daily Survival' – N.E.E.D.S. For opportunity cost, remember it as 'The One That Got Away' – you chose Option A, so the value of the best Option B you sacrificed is your opportunity cost. Use the phrase 'Cost of saying no to the next best thing'.
记忆钩子：把NEEDS想成'Never Ending Essentials for Daily Survival'（永不终结的日常生存必需品）——N.E.E.D.S.。机会成本可以记作'溜掉的那个'——你选了方案A，那么你牺牲的最佳方案B的价值就是机会成本。守住这句话：'对次优选项说“不”的代价'。
3. Factors of Production | 生产要素
The four factors of production are Land (natural resources), Labour (human effort), Capital (man-made goods used in production), and Enterprise (the willingness to take risks and combine the other factors). The rewards for each are rent, wages, interest, and profit respectively.
四种生产要素是土地（自然资源）、劳动（人力）、资本（用于生产的人造品）和企业（承担风险并组合其他要素的意愿）。各自的报酬分别是地租、工资、利息和利润。
Memory hook: The acronym CELL: Capital, Enterprise, Land, Labour. Or remember 'CELLy the pig' – a pig eating everything: land (soil), labour (snout digging), capital (farm tools), enterprise (the farmer's risk). For rewards, link them: Landlord gets Rent, Labour earns Wages, Capital earns Interest, Entrepreneur gets Profit – 'Really Weird Income Pets'.
记忆钩子：首字母缩略词CELL：Capital（资本）、Enterprise（企业）、Land（土地）、Labour（劳动）。或者记住'CELLy the pig'——一头什么都吃的猪：土地（土壤）、劳动（拱土）、资本（农具）、企业（农民的风险）。报酬联想：Landlord（地主）得Rent（地租），Labour（工人）挣Wages（工资），Capital（资本）获Interest（利息），Entrepreneur（企业家）拿Profit（利润）——'Really Weird Income Pets'（真奇怪的收入宠物）。
4. Production Possibility Frontier (PPF) | 生产可能性边界
A PPF curve shows the maximum combinations of two goods an economy can produce with its existing resources and technology. Points on the curve are efficient, inside are inefficient, and outside are unattainable. Moving along the curve involves an opportunity cost.
PPF曲线展示一个经济体用现有资源和技术能生产的两种商品的最大组合。曲线上的点是有效率的，内部的点是无效率的，外部的点不可达到。沿曲线移动就会产生机会成本。
Memory hook: See the curve as a 'Perfect Pottery Fence'. It marks the boundary of production possibilities. Imagine a potter who can only choose between making vases or bowls. To get more vases, she must give up some bowls – that trade-off is her opportunity cost, shown by moving along the fence.
记忆钩子：把曲线看成'完美陶艺栅栏'。它标出生产可能性的边界。想象一个陶工只能选做花瓶或碗。要多得花瓶就得放弃一些碗——这种取舍就是她的机会成本，表现为沿栅栏移动。
5. Demand and the Law of Demand | 需求与需求定律
Demand is the quantity of a good or service that consumers are willing and able to buy at different prices over a period of time. The law of demand states that, ceteris paribus, as price falls, quantity demanded rises – and vice versa. This inverse relationship is represented by a downward-sloping demand curve.
需求指在一段时间内，消费者在不同价格水平上愿意并能够购买的商品或服务的数量。需求定律指出，其他条件不变时，价格下降则需求量上升，反之亦然。这种反向关系表现为向下倾斜的需求曲线。
Memory hook: 'When Price Drops, Basket Pops' – imagine a sale where the price tag falls, and your shopping basket instantly fills up. Also, D for Demand, D for Downward slope. Remember 'P and Q dance inversely' – P up, Q down; P down, Q up.
记忆钩子：'价格一跌，篮子就爆'——想象打折时价签一降，购物篮立刻塞满。再有，Demand 的 D，代表 Downward（向下）斜率。记住'P与Q反向跳舞'——P升Q降，P降Q升。
6. Supply and the Law of Supply | 供给与供给定律
Supply is the quantity of a good or service that producers are willing and able to offer for sale at different prices. The law of supply says that, ceteris paribus, as the price rises, the quantity supplied increases. The supply curve slopes upward.
供给是生产者愿意并能以不同价格提供销售的商品或服务数量。供给定律指出，其他条件不变，价格上升时供给量增加。供给曲线向上倾斜。
Memory hook: 'Producers Love Profit' – higher prices mean bigger reward, so they make more. Picture an upward staircase: Supply curve goes Up like Stairs. S for Supply, S for Stairs. If demand is a downhill slide, supply is an uphill climb.
记忆钩子：'生产者爱利润'——价格更高意味回报更大，于是他们生产更多。想象上升的楼梯：供给曲线像楼梯一样向上。S for Supply（供给）, S for Stairs（楼梯）。如果需求是下坡滑梯，供给就是上坡攀登。
7. Market Equilibrium | 市场均衡
Market equilibrium occurs where the quantity demanded equals the quantity supplied. The equilibrium price is the price at which the plans of consumers and producers match. There is no excess demand (shortage) or excess supply (surplus) at this point.
市场均衡发生在需求量与供给量相等之处。均衡价格是消费者计划与生产者计划吻合的价格。在该点既无超额需求（短缺），也无超额供给（过剩）。
Memory hook: Think of a seesaw perfectly balanced – 'Equilibrium = Equal Balance' price is too high, a surplus sits on top; if too low, a shortage gap opens at the bottom.
记忆钩子：想象一个完美平衡的跷跷板——'均衡就是平衡'。设想买方和卖方在同一价格上握手。市场如挡风玻璃般清晰。如果价格过高，顶部就压着过剩；如果太低，底部便出现短缺缺口。
8. Price Elasticity of Demand (PED) | 需求价格弹性
PED measures the responsiveness of quantity demanded to a change in price. It is calculated using the formula:
PED 衡量需求量对价格变动的反应程度。它的计算公式为：
PED = %ΔQd / %ΔP
d is price elastic; if PED < 1, demand is price inelastic; if PED = 1, it is unit elastic.
若PED > 1，需求是价格弹性的；若PED < 1，需求是价格非弹性的；若PED = 1，则为单位弹性。
Memory hook: Break the word: 'Elasti-city'. Think of a rubber band – a small price pull gives a big quantity stretch (elastic). A stiff rope barely stretches (inelastic). For perfect inelasticity, picture insulin – price change doesn't alter demand. For elasticity, think of luxury chocolates – a small price drop and demand balloons.
记忆钩子：拆开单词'Elasti-city'（弹性之城）。想象一根橡皮筋——价格的轻微拉扯会让数量大幅伸展（弹性）。一根硬绳几乎不伸长（非弹性）。对于完全非弹性，想象胰岛素——价格变化不影响需求。对于弹性，想象奢侈巧克力——价格稍微下跌，需求就膨胀。
9. Specialisation and Division of Labour | 专业化与劳动分工
Specialisation occurs when individuals, firms, or countries concentrate on producing a limited range of goods or services. Division of labour breaks the production process into small, specific tasks, each performed by different workers. Both raise productivity and efficiency.
专业化发生在个人、企业或国家专注于生产有限范围的商品或服务时。劳动分工将生产过程拆分为细小且特定的任务，由不同工人分别完成。二者都提高生产率和效率。
Memory hook: Visualise a burger assembly line – one person grills patties, another slices buns, a third adds lettuce. That is division of labour, a form of specialisation. The mnemonic 'SPAD' – Specialisation Produces Awesome Division. Remember Adam Smith's pin factory: ten workers each doing a tiny task made thousands more pins than making whole pins alone.
记忆钩子：想象汉堡流水线——一人烤肉饼，一人切面包，另一人加生菜。这就是劳动分工，一种专业化形式。记忆法'SPAD'——Specialisation（专业化）Produces（带来）Awesome（极好的）Division（分工）。牢记亚当·斯密的大头针工厂：十个工人每人做一小工序，比单独制作整针多产出数千枚针。
10. Economic Systems | 经济制度
The three main economic systems are market economy (decisions made by consumers and producers, no government intervention), planned or command economy (government controls all resources and decisions), and mixed economy (a blend of market forces and government involvement).
三种主要经济制度是市场经济（消费者与生产者做决定，无政府干预）、计划或指令经济（政府掌控所有资源和决策）以及混合经济（市场力量与政府参与的结合）。
Memory hook: Imagine three lunch scenarios: a market economy is a food court where you choose freely; a planned economy is a school canteen with one fixed menu; a mixed economy is a cafeteria with some free-choice counters and some regulated healthy-meal sections. Use 'M-P-M' as the order: Market, Planned, Mixed.
记忆钩子：想象三种午餐场景：市场经济是美食广场，你自由选择；计划经济是学校食堂，固定菜单；混合经济是自助餐厅，部分自由选，部分强制健康餐。用M-P-M排序：Market, Planned, Mixed。或者记住'Many People Mix'——市场经济、计划经济和混合经济。
11. Inflation and its Measurement | 通货膨胀及其测量
Inflation is a sustained increase in the general price level of goods and services over time, reducing the purchasing power of money. It is commonly measured by the Consumer Price Index (CPI), which tracks a basket of goods and services purchased by a typical household.
通货膨胀是商品和服务的总体价格水平在一段时间内持续上升的现象，它会削弱货币的购买力。通常用消费者价格指数（CPI）来衡量，它追踪一个典型家庭购买的一篮子商品和服务。
Memory hook: Think of a balloon inflating – each inflation breath makes the price balloon bigger and your money thinner. 'CPI' sounds like 'See Pie' – imagine watching the price of a pie go up every month. 'Basket never gets cheaper' – the CPI basket always costs more if inflation is positive. Remember, too many pesos chasing too few pies.
记忆钩子：想象气球充气——每次通货膨胀的吹气都让价格气球变大，而你的钱变薄。'CPI'听起来像'See Pie'（见派饼）——想象每月看着派饼的价格上涨。'篮子永远不会变便宜'——只要通胀为正，CPI篮子总是更贵。记住，太多比索追逐太少的派。
12. Fiscal and Monetary Policy | 财政与货币政策
Fiscal policy involves government decisions on taxation and spending to influence the economy. Monetary policy is controlled by the central bank, which manages the money supply and interest rates. Expansionary policies boost demand, while contractionary policies cool down an overheating economy.
财政政策涉及政府关于税收和支出的决策以影响经济。货币政策由中央银行控制，管理货币供给和利率。扩张性政策刺激需求，紧缩性政策则给过热的经济降温。
Memory hook: 'Fiscal = Fisc, the old word for treasury chest' – the government opens or closes the chest. 'Monetary = Money matters, managed by the Central Bank' policy; the central bank adjusts the cruise control (interest rates) via monetary policy.
记忆钩子：'Fiscal = Fisc（国库的古语）'——政府打开或关闭宝箱。'Monetary = Money（货币），由中央银行打理'。想象一辆车：政府通过财政政策踩油门（支出）或刹车（税收）；中央银行通过货币政策调节巡航控制（利率）。
Published by TutorHao | Economics Revision Series | aleveler.com
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