Pre-U CAIE Economics: Vocabulary & Terminology Memorisation Guide | Pre-U CAIE 经济：词汇术语速记指南

📚 Pre-U CAIE Economics: Vocabulary & Terminology Memorisation Guide | Pre-U CAIE 经济：词汇术语速记指南

Mastering economics demands a firm command of its specialist language. This guide breaks down essential Pre-U CAIE terms, offering clear definitions alongside effective memory strategies. Each section pairs an English explanation with its Chinese counterpart, ensuring you build a durable bilingual economic vocabulary.

掌握经济学需要对其专业语言有牢固的掌控。本指南拆解了 Pre-U CAIE 的关键术语，提供清晰的定义和有效的记忆策略。每个部分都将英文解释与中文解释配对，确保你建立起持久的双语经济学词汇库。

1. Understanding Scarcity and Choice | 理解稀缺与选择

The basic economic problem arises from unlimited wants confronting limited resources. Scarcity forces individuals, firms, and governments to make choices, each of which involves a trade-off. Recognising scarcity as the condition that compels decision-making is the first step toward thinking like an economist. It is not merely a shortage but a permanent state where not all goals can be simultaneously achieved.

基本经济问题源于无限的欲望与有限的资源之间的矛盾。稀缺迫使个人、企业和政府做出选择，而每一个选择都涉及权衡。认识到稀缺是迫使做出决策的条件，是像经济学家一样思考的第一步。它不仅仅是短缺，而是一种所有目标不可能同时实现的持续状态。

Choice leads to the concept of opportunity cost, which is the next-best alternative forgone. Every decision has a cost, even if it is not monetary. For memory, associate scarcity with the image of a pie that can never be large enough for everyone’s appetite.

选择引出了机会成本的概念，即被放弃的次优替代方案。每个决策都有成本，即使它不是金钱上的。为了记忆，将稀缺与一个永远无法满足所有人胃口的馅饼形象联系起来。

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2. Opportunity Cost: The Heart of Economics | 机会成本：经济学的核心

Opportunity cost is the value of the single best alternative sacrificed when a choice is made. In CAIE exams, you must move beyond vague definitions and apply the concept to production, consumption, and government policy. For example, a government choosing to build a hospital rather than a school faces the opportunity cost of the educational benefits lost. This cost does not appear in accounting statements, but it is fundamental to rational decision-making.

机会成本是做出选择时牺牲的单一最佳替代方案的价值。在 CAIE 考试中，你必须超越模糊的定义，并将该概念应用于生产、消费和政府政策。例如，一个选择建造医院而非学校的政府面临着失去教育收益的机会成本。这一成本不会出现在会计报表中，但对理性决策却是基础性的。

A powerful memory aid is the question: ‘What did I give up?’ Every time you study economics, you sacrifice leisure time – that is your opportunity cost in action. Linking the abstract term to a personal experience locks it into long-term memory.

一个强大的记忆辅助是问自己：“我放弃了什么？”每次你学习经济学时，你牺牲了休闲时间——那就是你实践中的机会成本。将抽象术语与个人体验联系起来，可将其锁定于长期记忆中。

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3. Demand and Supply: The Market Forces | 需求与供给：市场力量

Demand represents both willingness and ability to purchase a good at a given price over a specific period. The law of demand states an inverse relationship between price and quantity demanded, ceteris paribus. Supply, on the other hand, reflects producers’ readiness to sell, with a direct price–quantity supplied link. Market equilibrium occurs where the two curves intersect, setting the clearing price.

需求代表在特定时期内以给定价格购买某种商品的意愿和能力。需求定律表明，在其他条件不变的情况下，价格与需求量呈反向关系。另一方面，供给反映了生产者的销售意愿，价格与供给量呈正向联系。市场均衡发生在两条曲线相交处，确定了出清价格。

To remember the difference, visualise climbing a supply staircase (higher price, more supplied) and sliding down a demand slide (higher price, less demanded). Shifts of the curves occur due to changes in determinants other than the good’s own price – income, tastes, costs of production, and more. Always ask whether a factor affects buyers’ or sellers’ behaviour to distinguish movements along a curve from shifts of the curve.

为了记住区别，想象爬上一个供给楼梯（价格越高，供给越多）和滑下一个需求滑梯（价格越高，需求越少）。曲线的移动是由于商品自身价格以外的决定因素变化所致——如收入、偏好、生产成本等。始终要问某个因素是否影响买方或卖方行为，以区分沿曲线的移动与曲线的移动。

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4. Elasticities: Measuring Responsiveness | 弹性：衡量反应程度

Elasticity quantifies how much one variable responds to changes in another. Price elasticity of demand (PED) measures consumers’ sensitivity to price changes; the formula is:

PED = %Δ Quantity Demanded ÷ %Δ Price

If |PED| > 1, demand is elastic (responsive); if |PED| < 1, it is inelastic. The result determines whether a price rise will increase or decrease total revenue for the firm.

弹性量化了一个变量对另一个变量变化的反应程度。需求的价格弹性（PED）衡量消费者对价格变动的敏感度；公式为：

PED = 需求量变动百分比 ÷ 价格变动百分比

如果 |PED| > 1，需求富有弹性（反应灵敏）；如果 |PED| < 1，则缺乏弹性。这一结果决定了价格上涨会增加还是减少企业的总收入。

Income elasticity (YED) and cross-price elasticity (XED) extend the idea. YED indicates whether a good is normal or inferior; XED reveals complementarity or substitutability. A mnemonic for YED: ‘My YED tells me if the good is normal or needs an income downgrade.’ For XED, think ‘Cross the street to the substitute shop.’ Price elasticity of supply (PES) follows similar logic but focuses on producers’ capacity to adjust output.

收入弹性（YED）和交叉价格弹性（XED）扩展了这一概念。YED 指示一种商品是正常品还是劣等品；XED 揭示了互补性或替代性。YED 的记忆口诀：“我的 YED 告诉我商品是正常的还是需要收入降级。”对于 XED，设想“过马路去替代品商店”。供给的价格弹性（PES）遵循类似逻辑，但侧重于生产者调整产出的能力。

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5. Market Structures and Competition | 市场结构与竞争

Market structures span a spectrum from perfect competition to monopoly. Perfect competition features many firms, homogeneous products, free entry and exit, and perfect information. Firms are price takers, earning only normal profit in the long run. At the other extreme, a pure monopoly is a single seller with significant barriers to entry, able to set prices and earn supernormal profits.

市场结构涵盖从完全竞争到垄断的范围。完全竞争具有许多厂商、同质产品、自由进出以及完全信息的特点。企业是价格接受者，长期中仅获得正常利润。在另一个极端，纯粹垄断是单一卖方，存在显著进入壁垒，能够设定价格并获得超额利润。

Between these lie monopolistic competition and oligopoly. Monopolistic competition adds product differentiation, giving firms some price-setting power. Oligopoly is characterised by a few interdependent firms, leading to strategic behaviour often modelled by game theory – think of the kinked demand curve. To categorise any market, use the CARMEL checklist: Concentration ratio, Advertising, Regulation, Market share, Entry barriers, Long-run profit.

在这两者之间，存在垄断竞争和寡头垄断。垄断竞争加入了产品差异化，赋予企业一定的定价权。寡头垄断的特征是少数相互依存的企业，导致往往用博弈论建模的策略行为——想想弯折的需求曲线。要分类任何市场，可以使用 CARMEL 清单：集中度、广告、监管、市场份额、进入壁垒、长期利润。

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6. Macroeconomic Objectives: Growth, Inflation, Employment | 宏观经济目标：增长、通胀、就业

Governments typically pursue four broad objectives: stable economic growth, low and stable inflation, low unemployment, and a sustainable balance of payments. Economic growth is measured by the percentage change in real GDP. Inflation is tracked through the Consumer Price Index (CPI) and indicates a sustained rise in the general price level. A moderate inflation target around 2% is common, as deflation can be equally damaging.

政府通常追求四大目标：稳定的经济增长、低且稳定的通货膨胀、低失业率以及可持续的国际收支平衡。经济增长以实际 GDP 的百分比变动来衡量。通货膨胀通过消费者价格指数（CPI）追踪，表示一般价格水平的持续上升。约 2% 的温和通胀目标是常见的，因为通货紧缩同样具有破坏性。

Unemployment arises from different causes – cyclical, structural, frictional. The labour force survey (LFS) measures those actively seeking work. Full employment does not mean zero unemployment; it means that cyclical unemployment is eliminated. The Phillips curve illustrates a short-run trade-off between inflation and unemployment, but the long-run relationship is more complex. Remember: ‘Higher growth can heat the economy, cooking up inflation, while a slump leaves workers idle.’

失业源于不同原因——周期性、结构性、摩擦性。劳动力调查（LFS）衡量那些积极寻找工作的人。充分就业并不意味着零失业；它意味着周期性失业被消除。菲利普斯曲线展示了通胀与失业之间的短期权衡，但长期关系更为复杂。记住：“高增长能让经济过热，熬出通胀，而低迷则让工人闲置。”

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7. Fiscal and Monetary Policy Tools | 财政与货币政策工具

Fiscal policy involves government spending and taxation to influence aggregate demand. Expansionary fiscal policy (higher spending, lower taxes) boosts AD during a recession, while contractionary policy cools an overheated economy. The budget balance (T – G) can be in surplus, deficit, or balanced. The national debt accumulates from past deficits and is a stock variable, unlike the flow deficit.

财政政策涉及政府支出和税收，以影响总需求。扩张性财政政策（增加支出、减税）在经济衰退期间提振总需求，而紧缩性政策则为过热的经济降温。预算平衡（T – G）可以是盈余、赤字或平衡。国家债务由过去的赤字累积而来，是一个存量变量，不同于流量的赤字。

Monetary policy is managed by the central bank, manipulating interest rates, money supply, or exchange rates to achieve price stability. A lower policy rate reduces borrowing costs, stimulating investment and consumption. Quantitative easing (QE) is an unconventional tool where the central bank buys government bonds to inject liquidity. A handy contrast: ‘Fiscal is direct and political; monetary is indirect and technical.’ This dichotomy captures their institutional differences.

货币政策由中央银行管理，通过操控利率、货币供应或汇率来实现价格稳定。较低的基准利率降低了借贷成本，刺激投资和消费。量化宽松（QE）是一种非常规工具，中央银行购买政府债券以注入流动性。一个有用的对比：“财政是直接的、政治性的；货币是间接的、技术性的。”这种二分法抓住了它们的制度差异。

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8. International Trade and Exchange Rates | 国际贸易与汇率

Comparative advantage underpins the case for free trade; a country should specialise in goods where it has the lowest opportunity cost, even if it holds an absolute disadvantage. The terms of trade index (export prices ÷ import prices × 100) measures a country’s trading position. A deterioration means a country must export more to afford the same volume of imports.

比较优势是自由贸易理由的基础；一个国家应该专门生产其机会成本最低的商品，即使它存在绝对劣势。贸易条件指数（出口价格 ÷ 进口价格 × 100）衡量一个国家的贸易地位。贸易条件恶化意味着一个国家必须出口更多才能负担相同数量的进口。

Exchange rates are determined by demand and supply in floating systems, or by government policy in fixed regimes. Appreciation makes exports dearer and imports cheaper, potentially worsening the current account. The Marshall-Lerner condition states that a depreciation will improve the trade balance if the sum of demand elasticities for exports and imports exceeds one. Mnemonic: ‘ML > 1 to get the job done.’ Protectionist measures such as tariffs and quotas alter trade flows but often create deadweight welfare loss.

汇率在浮动汇率制下由供求决定，在固定汇率制下则由政府政策决定。升值使出口更贵、进口更便宜，可能恶化经常账户。马歇尔-勒纳条件指出，如果出口和进口的需求弹性之和大于 1，贬值将改善贸易平衡。口诀：“ML > 1 来搞定。”关税和配额等保护主义措施改变了贸易流向，但往往造成无谓的福利损失。

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9. Development Economics: Key Indicators | 发展经济学：关键指标

Development goes beyond GDP growth; it encompasses improvements in living standards, health, education, and political freedom. The Human Development Index (HDI) combines life expectancy, mean and expected years of schooling, and GNI per capita (PPP). While HDI captures a broader picture, it still misses inequality within countries and qualitative aspects of well-being.

发展超越了 GDP 增长；它涵盖生活水平、健康、教育和政治自由的改善。人类发展指数（HDI）结合了预期寿命、平均和预期受教育年限以及人均国民总收入（购买力平价）。尽管 HDI 捕捉了更广泛的画面，但它仍然遗漏了国家内部的不平等和福祉的定性方面。

Other indicators include the Multidimensional Poverty Index (MPI) and the Gini coefficient for inequality. A Gini of 0 represents perfect equality, 100 perfect inequality. Policies for development range from trade liberalisation and foreign direct investment to microfinance and aid. The basic needs approach emphasises providing essential goods directly. Connect the terms visually: picture HDI as a three-legged stool – health, knowledge, income – to convey stability and balance.

其他指标包括多维贫困指数（MPI）和不平等的基尼系数。基尼系数为 0 代表完全平等，100 代表完全不平等。促进发展的政策涵盖从贸易自由化和外商直接投资到小额信贷和援助。基本需求方法强调直接提供必需品。将这些术语形象地联系起来：把 HDI 想象成一张三条腿的凳子——健康、知识、收入——以传达稳定与平衡。

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10. Externalities and Market Failure | 外部性与市场失灵

Market failure occurs when the price mechanism fails to allocate resources efficiently, often due to externalities, public goods, information asymmetries, or market power. A negative externality, such as pollution from a factory, imposes a cost on third parties not reflected in the supply curve. This leads to overproduction compared to the social optimum. A corrective Pigouvian tax can internalise this external cost.

当价格机制未能有效配置资源时，就会发生市场失灵，这通常由外部性、公共物品、信息不对称或市场力量引起。负外部性，例如工厂污染，给第三方带来了未反映在供给曲线上的成本。这导致与社会最优水平相比的过度生产。矫正性的庇古税可以将这种外部成本内部化。

Positive externalities (e.g. vaccinations) confer benefits on others beyond the private decision-maker, causing underconsumption. Subsidies can bridge the gap between private and social benefit. Public goods are non-rival and non-excludable, leading to the free-rider problem. Remember the classic lighthouse example. Information failure, such as adverse selection and moral hazard, disrupts insurance markets. Use the acronym ‘EMIP’ (Externalities, Missing markets, Imperfect information, Public goods) to recall the main sources of market failure.

正外部性（如疫苗接种）为私人决策者之外的其他人带来了利益，导致消费不足。补贴可以弥合私人收益与社会收益之间的差距。公共物品是非竞争性和非排他性的，导致了搭便车问题。记住经典的灯塔例子。信息失灵，如逆向选择和道德风险，会扰乱保险市场。使用首字母缩略词 “EMIP”（外部性、缺失市场、不完全信息、公共物品）来回忆市场失灵的主要来源。

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11. Monetary Aggregates and the Quantity Theory of Money | 货币总量与货币数量论

Money serves as a medium of exchange, unit of account, store of value, and standard of deferred payment. Narrow money (M0, M1) includes cash and liquid deposits, while broad money (M3, M4) adds near-money assets. The quantity theory of money, expressed by the equation of exchange, links money supply to the price level:

MV = PY

Where M is the money supply, V the velocity of circulation, P the price level, and Y real output. Assuming V and Y are stable in the short run, an increase in M leads to a proportional rise in P – the monetarist explanation of inflation.

货币充当交换媒介、记账单位、价值储藏和延期支付标准。狭义货币（M0、M1）包括现金和流动性存款，而广义货币（M3、M4）增加了准货币资产。货币数量论由交易方程表达，将货币供应与价格水平联系起来：

MV = PY

其中 M 为货币供应，V 为流通速度，P 为价格水平，Y 为实际产出。假设短期中 V 和 Y 稳定，M 的增加会导致 P 同比例上升——这是货币主义者对通货膨胀的解释。

Central banks monitor monetary aggregates to gauge inflationary pressures. In a liquidity trap, increases in the money supply may fail to stimulate the economy because interest rates are near zero and demand for money becomes perfectly elastic. The phrase ‘pushing on a string’ captures the impotence of monetary policy in such a scenario.

中央银行监测货币总量以衡量通胀压力。在流动性陷阱中，货币供应的增加可能无法刺激经济，因为利率接近于零且货币需求变得完全弹性。“推绳子”这个短语抓住了货币政策在这种情景下的无力。

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12. Review Techniques for Economic Terminology | 经济术语复习技巧

Effective memorisation combines active recall, spaced repetition, and meaningful association. Instead of rereading definitions, use flashcards with the term on one side and the definition plus a diagram on the reverse. Self-testing forces retrieval and strengthens neural pathways. Tools like Anki or Quizlet allow you to schedule reviews based on the forgetting curve.

有效的记忆结合了主动回忆、间隔重复和意义关联。与其反复阅读定义，不如使用抽认卡，一面写术语，另一面写定义加图表。自我测试迫使提取信息并强化神经通路。Anki 或 Quizlet 等工具允许你根据遗忘曲线安排复习。

Create mnemonics and stories that link terms to vivid images. For ‘inferior goods’, imagine a person downgrading from steak to instant noodles when their income rises – a counterintuitive image that makes the term stick. Build a mind map connecting macro topics: from GDP to unemployment, to inflation, to policy responses. The more connections you form, the easier it becomes to retrieve the term under exam pressure. Regularly write full definitions in your own words, then compare with textbook versions to catch nuances.

创建助记符和故事，将术语与生动的形象联系起来。对于“劣等品”，想象一个人在收入增加时从牛排降级到方便面——一个违反直觉的画面，能帮助记住该术语。构建一个连接宏观主题的思维导图：从 GDP 到失业、到通胀、到政策反应。你建立的连接越多，在考试压力下检索术语就越容易。定期用自己的话写下完整的定义，然后与教科书版本比较，以捕捉细微差别。

Published by TutorHao | Economics Revision Series | aleveler.com

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