📚 Year 12 CAIE Economics: Vocabulary & Terminology Quick-Memory Guide | Year 12 CAIE 经济：词汇术语速记指南
Economics can feel like learning a new language, but the key to exam success is mastering its essential vocabulary. This guide breaks down the core Year 12 CAIE Economics terms into memorable chunks, pairing precise English definitions with Chinese explanations and clever memory hooks. Whether you’re tackling the basic economic problem, demand and supply, or market failure, having a firm grip on terminology will boost your confidence and your marks.
经济学有时像在学一门新语言，但考试成功的关键就在于掌握其核心术语。本指南将 Year 12 CAIE 经济学的基本词汇拆解成容易记忆的模块，将准确的英文定义与中文解释和巧妙的记忆窍门配对。无论你面对的是基本经济问题、需求与供给，还是市场失灵，牢牢掌握术语都能提升你的信心和分数。
1. Scarcity, Choice, and Opportunity Cost | 稀缺性、选择与机会成本
Scarcity refers to the fundamental economic problem of having unlimited wants but limited resources. It forces every economy to answer three questions: what to produce, how to produce, and for whom to produce. Think ‘S’ for scarcity and ‘S’ for ‘supply is short’ – we never have enough to satisfy everyone.
稀缺性是指无限欲望与有限资源之间的矛盾这一基本经济问题。它迫使每一个经济体回答三个问题：生产什么、如何生产、为谁生产。记忆时可将稀缺性的英文 scarcity 与 ‘short supply’（供应不足）联系——我们永远没有足够的产品满足所有人。
Opportunity cost is the value of the next best alternative forgone when a choice is made. Remember it as ‘OC’ – the ‘Other Choice’ you give up. For example, if a government spends £10 billion on a new railway, the opportunity cost is the schools or hospitals that money could have been built.
机会成本是做出选择时所放弃的次优选项的价值。可记为 ‘OC’，即你放弃的 ‘Other Choice’（另一个选择）。例如，如果政府花费 100 亿英镑修建一条新铁路，其机会成本就是本可以用这笔钱建造的学校或医院。
The concept of trade-offs is closely related: it acknowledges that to get more of one good, you must sacrifice some of another. A quick shortcut: opportunity cost = ‘the road not taken’.
权衡取舍的概念与此紧密相连：要获得更多某样商品，就必须牺牲一些其他商品。一个快速记忆法：机会成本 = ‘未选之路’。
2. Factors of Production and Their Rewards | 生产要素及其报酬
Resources are grouped into four factors of production: land (natural resources), labour (workforce), capital (man-made goods used in production), and entrepreneurship (the risk-taking ability to organise the other three). Visualise them as ‘L-L-C-E’ or recall ‘CELL’ by swapping the first letters: Capital-Entrepreneurship-Land-Labour.
资源被分为四种生产要素：土地（自然资源）、劳动力（职工）、资本（用于生产的制成品）和企业家的才能（将其他三种要素组织起来的风险承担能力）。可用首字母 ‘L-L-C-E’ 来记忆，或者调整顺序记成 ‘CELL’：资本-企业家才能-土地-劳动力。
Each factor earns a specific reward: land earns rent, labour earns wages, capital earns interest, and entrepreneurship earns profit. The mnemonic ‘RWIP’ (Rent, Wages, Interest, Profit) can help you recall them in sequence.
每种要素获得特定的报酬：土地获得地租，劳动力获得工资，资本获得利息，企业家才能获得利润。记忆字母组合 ‘RWIP’（地租、工资、利息、利润）可以帮助你按顺序回忆。
Free goods are abundant and have no opportunity cost (like air), while economic goods are scarce and require a sacrifice to obtain. Remember that ‘free’ does not mean ‘at zero price’; it means ‘not scarce’.
免费物品供应充裕且没有机会成本（如空气），而经济物品是稀缺的，获取需要付出代价。记住，’免费’ 并非 ‘价格为零’，而是 ‘不稀缺’。
3. Production Possibility Curve (PPC) | 生产可能性曲线 (PPC)
The Production Possibility Curve (PPC) shows the maximum combinations of two goods an economy can produce with full employment of its resources and a given state of technology. Points inside the curve represent inefficiency or unemployment; points on the curve show productive efficiency; points outside are currently unattainable. Visualise a bow-shaped curve: the outward bow reflects increasing opportunity cost.
生产可能性曲线 (PPC) 展示了一个经济体在资源充分就业且技术水平给定的情况下，所能生产的两种商品的最大组合。曲线以内的点代表效率低下或失业；曲线上的点表示生产效率；曲线外的点目前无法达到。想象一条向外凸出的弓形曲线：曲线向外凸出反映了递增的机会成本。
An outward shift of the whole PPC indicates economic growth, caused by an increase in the quantity or quality of resources, or technological progress. A memory aid: ‘Shift out, grow about’.
整条 PPC 向外移动表示经济增长，原因在于资源数量或质量的提升，或者技术进步。记忆窍门：’曲线外移，经济增长随即来’。
If the PPC shifts outwards only on one axis, that illustrates an improvement in the technology or resources specific to that good. This is often tested in multiple-choice questions – always check which good’s maximum output has changed.
如果 PPC 只沿着一个轴向外移动，则说明仅生产该商品的技术或资源得到改善。这在选择题中经常考查——一定要检查哪种商品的最大产出发生了变化。
4. Demand, Supply, and the Law of Diminishing Marginal Utility | 需求、供给及边际效用递减规律
Demand is the quantity of a good or service that consumers are willing and able to buy at various prices, ceteris paribus. The law of demand states that as price falls, quantity demanded rises, due to the income effect (purchasing power increases) and the substitution effect (consumers switch from relatively more expensive alternatives). Recall D for ‘downward sloping’.
需求是指在其他条件不变的情况下，消费者在不同价格水平上愿意并且能够购买的商品或服务数量。需求规律表明，价格下降，需求量上升，原因在于收入效应（购买力增加）和替代效应（消费者从相对更贵的替代品转换过来）。记住 D 代表 ‘向下倾斜’。
Marginal utility is the extra satisfaction from consuming one additional unit. The law of diminishing marginal utility explains why demand curves slope downwards: as you consume more, the additional satisfaction decreases, so you will only buy more if the price falls to match the lower utility. Think ‘first slice of pizza gives highest pleasure, fifth slice much less’.
边际效用指多消费一单位商品带来的额外满足感。边际效用递减规律解释了需求曲线向下倾斜的原因：随着消费量增加，额外满足感递减，所以只有当价格降到与较低效用相匹配时，你才会多买。试想 ‘第一块比萨饼最香，第五块就没那么诱人了’。
On the supply side, the law of supply says that as price rises, quantity supplied increases, because higher prices mean higher potential profit, making it attractive for firms to expand output. A quick mnemonic: supply slopes ‘up’ like going ‘up’ a ladder to higher profit.
在供给方面，供给规律指出，价格上升，供给量增加，因为高价意味着更高的潜在利润，吸引企业扩大产出。一个简单的记忆法：供给曲线向上倾斜，就像爬 ‘向上’ 的梯子追求更高利润。
5. Determinants of Demand and Supply – Shifters vs Movements | 需求与供给的决定因素——移动与滑动
A movement along the demand or supply curve is caused solely by a change in the good’s own price. A shift of the entire curve results from changes in any other determinant. Remember PASIFIC for demand shifters: Population, Advertising, Substitutes (price of), Income, Fashion/tastes, Interest rates (for borrowed goods), and Complements (price of).
需求量/供给量的变动（沿曲线滑动）仅由商品自身价格变化引起。整条曲线的移动则源自其他任何决定因素的变化。用 PASIFIC 记忆需求移动因素：人口、广告、替代品价格、收入、时尚/偏好、利率（对于借贷购买的商品）和互补品价格。
For supply, the shifters can be recalled with PINTSWC: Productivity, Indirect taxes, Natural factors (weather, disasters), Technology, Subsidies, Wages (cost of production), and the number of Competitors. Each of these changes the cost or ability to produce, shifting supply left or right.
对于供给，移动因素可用 PINTSWC 回忆：生产力、间接税、自然因素（天气、灾害）、技术、补贴、工资（生产成本）以及竞争者数量。其中每一项都会改变生产成本或生产能力，使供给曲线向左或向右移动。
A crucial exam tip: never write that demand ‘increases’ when you mean quantity demanded changes. Use precise language: ‘an increase in demand’ = a rightward shift of the demand curve; ‘an increase in quantity demanded’ = a movement down along the demand curve.
重要的考试提示：当你想表达需求量变化时，绝不要写成需求 ‘增加’。用语要精确：’需求增加’ 指需求曲线向右移动；’需求量增加’ 则是指沿着需求曲线向下滑动。
6. Price Elasticity of Demand (PED) and Its Determinants | 需求的价格弹性 (PED) 及其决定因素
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price. The formula: PED = % change in quantity demanded / % change in price. A PED > 1 is price elastic; PED < 1 is price inelastic; PED = 1 is unit elastic. Virtually all elasticity values are negative but we ignore the minus sign and use absolute values.
需求的价格弹性 (PED) 衡量需求量对价格变化的反应程度。公式：PED = 需求量变化百分比 ÷ 价格变化百分比。PED > 1 为富有弹性；PED < 1 为缺乏弹性；PED = 1 为单位弹性。几乎所有弹性值都是负数，但我们通常忽略负号，使用绝对值。
Factors making demand more elastic include: the availability of close substitutes, luxury vs necessity status, high proportion of income spent, and long time periods. Memory phrase: ‘S-L-I-T’ – Substitutes, Luxury, Income share, Time.
使需求更有弹性的因素包括：相近替代品的可得性、奢侈品而非必需品、支出占收入比例高、以及较长的时间区间。记忆词组：’S-L-I-T’——替代品、奢侈品、收入份额、时间。
PED is vital for firms deciding on price changes. If demand is elastic, a price cut will raise total revenue because the percentage increase in quantity sold outweighs the percentage fall in price. If demand is inelastic, a price rise boosts total revenue. Note the link: total revenue = price × quantity.
PED 对企业制定价格策略至关重要。如果需求富有弹性，降价会提高总收益，因为销售量增加的百分比超过了价格下降的百分比。如果需求缺乏弹性，提价则会增加总收益。记住这层关系：总收益 = 价格 × 数量。
7. Other Elasticities: YED, XED, and PES | 其他弹性：YED, XED 与 PES
Income elasticity of demand (YED) = % change in quantity demanded / % change in income. Normal goods have positive YED; inferior goods have negative YED. For normal goods, YED > 1 indicates a luxury good, while 0 < YED < 1 indicates a necessity. ‘Y’ for ‘your income’ helps recall the income connection.
需求的收入弹性 (YED) = 需求量变化百分比 ÷ 收入变化百分比。正常品的 YED 为正；劣等品的 YED 为负。对于正常品，YED > 1 表明其为奢侈品，0 < YED < 1 则为必需品。’Y’ 可联想为 ‘Your income’（你的收入），帮助记忆收入关联。
Cross elasticity of demand (XED) = % change in quantity demanded of good A / % change in price of good B. If XED > 0, the goods are substitutes; if XED < 0, they are complements. The ‘X’ symbolises crossing over between two goods, just like in substitution.
需求的交叉弹性 (XED) = 商品 A 的需求量变化百分比 ÷ 商品 B 的价格变化百分比。若 XED > 0，两商品为替代品；若 XED < 0，则为互补品。’X’ 象征着两种商品之间的交叉，恰如替代关系一般。
Price elasticity of supply (PES) = % change in quantity supplied / % change in price. Supply is price elastic when PES > 1, and inelastic when PES < 1. Key determinants: spare production capacity, length of production period, stock levels, and time. ‘Would you supply more if price jumped? That’s the elasticity of supply.’
供给的价格弹性 (PES) = 供给量变化百分比 ÷ 价格变化百分比。PES > 1 时供给富有弹性，PES < 1 时缺乏弹性。关键决定因素：闲置产能、生产周期长度、库存水平和时间。’如果价格飙升，你能多供应吗？这就是供给弹性’。
8. Market Equilibrium and Price Mechanism Functions | 市场均衡与价格机制的功能
Market equilibrium occurs where the quantity demanded equals the quantity supplied at a given price. No tendency for change exists at this point. This is the market-clearing price. An easy visual: where demand and supply curves cross, ‘E for Equilibrium and Equal’.
市场均衡发生在给定价格下需求量等于供给量的情况。在这一点上没有变化的趋势，这便是市场出清价格。一个简单的视觉化记忆：需求与供给曲线相交处，’E 代表 Equilibrium 和 Equal’。
Diagrams often show excess demand (shortage) when price is below equilibrium, and excess supply (surplus) when price is above equilibrium. Market forces naturally push the price back toward equilibrium — the ‘invisible hand’ at work.
图表通常展示当价格低于均衡价格时出现超额需求（短缺），当价格高于均衡价格时出现超额供给（过剩）。市场力量会自然将价格推回均衡——’看不见的手’ 在发挥作用。
The price mechanism performs three functions: signalling (prices indicate where resources are needed), incentivising (higher prices encourage production, lower prices encourage consumption), and rationing (scarce resources go to those willing and able to pay). Think ‘SIR’ – Signalling, Incentivising, Rationing.
价格机制履行三个功能：信号功能（价格指示资源需求所在）、激励功能（高价鼓励生产、低价鼓励消费）和配给功能（稀缺资源流向那些愿意且有能力支付的人）。用 ‘SIR’ 来记——信号、激励、配给。
9. Market Failure and Externalities | 市场失灵与外部性
Market failure occurs when the free market, without government intervention, fails to allocate resources efficiently, leading to a net social welfare loss. Main types: externalities, public goods, information gaps, and monopoly power. Remember ‘the market does not always get it right’.
市场失灵是指在没有政府干预的情况下，自由市场无法有效配置资源，从而导致社会净福利损失。主要类型有：外部性、公共物品、信息缺口和垄断势力。记住 ‘市场并不总是对的’。
Externalities are spill-over effects on third parties not directly involved in a transaction. Negative externalities impose external costs (e.g. pollution), causing over-production and over-consumption. Positive externalities yield external benefits (e.g. vaccination), leading to under-production and under-consumption. Think ‘NEG = Nasty Extra Gloom’, ‘POS = Positive Outside Spark’.
外部性是对未直接参与交易的第三方产生的溢出效应。负外部性带来外部成本（如污染），导致过度生产和过度消费。正外部性则产生外部收益（如疫苗接种），导致生产不足和消费不足。联想记忆：’NEG = Nasty Extra Gloom’（令人厌恶的额外阴郁），’POS = Positive Outside Spark’（正面的外部火花）。
Marginal social cost (MSC) = marginal private cost (MPC) + marginal external cost. Marginal social benefit (MSB) = marginal private benefit (MPB) + marginal external benefit. Allocative efficiency occurs where MSB = MSC. A quick formula: ‘S for sum, social = private + external’.
边际社会成本 (MSC) = 边际私人成本 (MPC) + 边际外部成本。边际社会收益 (MSB) = 边际私人收益 (MPB) + 边际外部收益。当 MSB = MSC 时达到配置效率。快速记法：’S 代表总和，社会 = 私人 + 外部’。
10. Public Goods, Free Riders, and Information Failures | 公共物品、搭便车者与信息失灵
Public goods have two key characteristics: non-rivalry (one person’s consumption doesn’t reduce availability for others) and non-excludability (once provided, you cannot stop non-payers from benefiting). A classic example is street lighting. The free-rider problem means private firms won’t supply such goods because they cannot charge everyone, so the government steps in.
公共物品有两大特征：非竞争性（一个人的消费不会减少其他人的可用量）和非排他性（一旦提供，无法阻止未付款者受益）。经典例子是路灯。搭便车问题意味着私人企业不愿提供这类商品，因为他们无法向所有人收费，于是政府介入。
Private goods are both rivalrous and excludable. Quasi-public goods exhibit one of the two public-good characteristics – e.g. a toll road is excludable but largely non-rivalrous until congested. Use ‘RIV-EX’ to quickly recall private good traits; ‘NON-RIV, NON-EX’ for pure public goods.
私人物品兼具竞争性和排他性。准公共物品仅具备公共物品两个特征中的一个——例如收费公路具有排他性，但在拥堵前基本是非竞争性的。用 ‘RIV-EX’ 快速回忆私人物品特征；用 ‘NON-RIV, NON-EX’ 记忆纯公共物品。
Asymmetric information occurs when one party in a transaction knows more than the other. This can lead to adverse selection (before a deal) and moral hazard (after a deal). For example, a used car seller knows more than the buyer (adverse selection); a person with full insurance might take more risks (moral hazard). Think ‘info-gap = market trap’.
信息不对称指交易中一方比另一方掌握更多信息。这可能导致逆向选择（交易前）和道德风险（交易后）。例如，二手车卖家比买家更了解车况（逆向选择）；有全额保险的人可能冒更多风险（道德风险）。记住 ‘信息缺口 = 市场陷阱’。
11. Government Intervention: Taxes, Subsidies, and Price Controls | 政府干预：税收、补贴与价格管制
To correct negative externalities, governments may impose indirect taxes equal to the size of the external cost. This shifts the supply curve leftwards and internalises the externality. A specific tax is a fixed amount per unit; an ad valorem tax is a percentage of the price. Memory tip: ‘SPecific = Per unit’, ‘Ad valorem = Add a %’.
为纠正负外部性，政府可以征收与外部成本等量的间接税。这会使供给曲线向左移动，将外部性内部化。从量税是对每单位征收固定金额；从价税是按价格百分比征收。记忆方法：’SPecific = Per unit’，’Ad valorem = Add a %’。
Subsidies shift the supply curve rightwards, lowering price and increasing quantity. They are used to encourage production of goods with positive externalities, such as renewable energy or education. Remind yourself: ‘Subsidy = Supply slides right’.
补贴使供给曲线向右移动，降低价格并增加数量。补贴用于鼓励生产有正外部性的商品，如可再生能源或教育。自我提示：’Subsidy = Supply slides right（补贴引致供给右滑）’。
Price controls include price ceilings (maximum prices set below equilibrium, causing shortages) and price floors (minimum prices set above equilibrium, resulting in surpluses). Rent controls and minimum wage are typical examples. Visualise the ceiling ‘above your head but below the equilibrium’ – a binding ceiling pushes price down.
价格管制包括价格上限（低于均衡价格的最高限价，导致短缺）和价格下限（高于均衡价格的最低限价，导致过剩）。租金管制和最低工资是典型例子。形象化记忆：天花板 (ceiling) 在你头顶上方，但要低于均衡点——具有约束力的价格上限将把价格拉低。
12. Costs, Revenues, and Profit – The Firm’s Vocabulary | 成本、收益与利润——厂商词汇
In economics, costs take on specific meanings. Total cost (TC) = total fixed cost (TFC) + total variable cost (TVC). Fixed costs do not change with output (e.g. rent); variable costs vary with output. Average cost (ATC) = TC / quantity. Marginal cost (MC) is the cost of producing one more unit – the MC curve always cuts ATC at its minimum point. ‘MC meets ATC at its lowest’ is a vital diagram rule.
在经济学中，成本有特定含义。总成本 (TC) = 总固定成本 (TFC) + 总可变成本 (TVC)。固定成本不随产量变化（如租金）；可变成本随产量变化。平均总成本 (ATC) = TC ÷ 产量。边际成本 (MC) 是多生产一单位产品所带来的成本——MC 曲线总是在 ATC 的最低点与其相交。’MC 在 ATC 最低处相交’ 是一条重要的图示规则。
On the revenue side, total revenue (TR) = price × quantity. Average revenue (AR) = TR / quantity = price, which is also the demand curve. Marginal revenue (MR) is the extra revenue from selling one more unit. For a price-taking firm in perfect competition, AR = MR = demand; a monopolist’s MR lies below AR due to price cuts needed to sell extra units.
在收益方面，总收益 (TR) = 价格 × 数量。平均收益 (AR) = TR ÷ 数量 = 价格，也就是需求曲线。边际收益 (MR) 是多销售一单位产品带来的额外收益。对完全竞争中的价格接受者而言，AR = MR = 需求线；而垄断者的 MR 位于 AR 下方，因为要销售更多产品就必须降价。
Profit maximisation occurs where MR = MC. Normal profit is the minimum reward needed to keep an entrepreneur in the industry – it is a cost of production (included in ATC). Supernormal profit (abnormal profit) is any profit above normal. Keep this distinction clear: normal profit is an implicit cost, not a surplus.
利润最大化发生在 MR = MC 处。正常利润是使企业家留在该行业所需的最低报酬——它是一种生产成本（包含在 ATC 中）。超额利润（超常利润）则是指超过正常利润的部分。要分清这一区别：正常利润是一种隐性成本，而不是剩余。
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