📚 Pre-U CIE Economics: A Quick Guide to Memorizing Key Terminology | Pre-U CIE 经济：词汇术语速记指南
Mastering economic terminology is often the biggest hurdle for Pre-U CIE Economics students. This concise guide turns abstract jargon into memorable insights, pairing each concept with its Chinese equivalent and a simple memory hook. You will not only recall definitions but also understand how to apply them accurately in essays and data response questions.
掌握经济学术语常常是 Pre-U CIE 经济学学生面临的最大障碍。这份简明指南将抽象的专业词汇转化为易于记忆的见解，每个概念都配有中文对应词和简单的记忆钩子。你不仅能记住定义，还能理解如何在论文和数据分析题中准确运用它们。
1. Scarcity and Choice | 稀缺与选择
Scarcity is the central economic problem: finite resources cannot satisfy infinite human wants. This forces every society to answer three fundamental questions: What to produce, how to produce, and for whom to produce. Think of scarcity as ‘unlimited wants meeting limited means’ — the ‘S’ in scarcity stands for ‘shortage’.
稀缺是经济学的核心问题：有限的资源无法满足无限的人类欲望。这迫使每个社会回答三个基本问题：生产什么、如何生产、为谁生产。把稀缺想象成“无限的欲望遇上有限的手段”——scarcity 中的“S”代表“shortage（短缺）”。
Opportunity cost is the next best alternative forgone when a choice is made. Every decision involves a trade-off, and the true cost is measured not in money but in missed opportunities. A quick memory trick: ‘O’ for opportunity cost also means ‘Other option lost’.
机会成本是做出选择时所放弃的次优替代方案。每个决定都涉及权衡，而真正的成本不是用金钱衡量，而是用错失的机会来衡量。一个简单的记忆技巧：“O”代表机会成本，也意味着“Other option lost（失去的另一个选项）”。
2. Demand and Supply | 需求与供给
The law of demand states that as price falls, quantity demanded rises, ceteris paribus. The downward-sloping demand curve reflects an inverse relationship. Remember the ‘D’ in demand as ‘Downward slope’.
需求定律指出，在其他条件不变的情况下，价格下降，需求量上升。向下倾斜的需求曲线反映了反向关系。记住 demand 中的“D”代表“Downward slope（向下倾斜）”。
Supply, on the other hand, slopes upwards: higher prices incentivise producers to offer more. The ‘S’ in supply stands for ‘Slopes up’. Distinguish carefully between a ‘movement along’ the curve (caused by a change in the good’s own price) and a ‘shift’ of the curve (caused by changes in non-price determinants like technology or input costs).
另一方面，供给曲线向上倾斜：更高的价格激励生产者提供更多商品。supply 中的“S”代表“Slopes up（向上倾斜）”。要仔细区分“沿曲线的移动”（由商品自身价格变化引起）和“曲线的移动”（由非价格决定因素如技术或投入成本变化引起）。
Equilibrium occurs where quantity demanded equals quantity supplied. Any excess demand pushes prices up, while excess supply pulls prices down—the invisible hand at work.
均衡发生在需求量等于供给量之处。任何超额需求都会推高价格，而超额供给则会压低价格——看不见的手在起作用。
3. Elasticity | 弹性
Price elasticity of demand (PED) measures responsiveness of quantity demanded to a change in price. If PED > 1, demand is elastic (consumers are sensitive to price changes); if PED < 1, it is inelastic. Use the phrase 'Elastic is Extra responsive'.
需求价格弹性（PED）衡量需求量对价格变化的反应程度。若 PED > 1，需求富有弹性（消费者对价格变化敏感）；若 PED < 1，需求缺乏弹性。用短语“Elastic is Extra responsive（弹性即额外反应）”来记忆。
Income elasticity of demand (YED) indicates how demand changes with consumer income. Normal goods have positive YED; inferior goods have negative YED. Think ‘Y’ in YED as ‘Your income’. Cross elasticity of demand (XED) relates the demand for one good to the price of another; positive for substitutes, negative for complements.
需求收入弹性（YED）表示需求如何随消费者收入变化。正常商品具有正的 YED；低档商品具有负的 YED。把 YED 中的“Y”看作“Your income（你的收入）”。需求交叉弹性（XED）将一种商品的需求与另一种商品的价格联系起来；替代品为正，互补品为负。
Price elasticity of supply (PES) depends largely on the time period and the availability of spare capacity. In the momentary period, supply is perfectly inelastic—you cannot instantly produce more strawberries.
供给价格弹性（PES）主要取决于时间周期和闲置产能的可用性。在瞬间期内，供给完全缺乏弹性——你无法瞬间生产出更多草莓。
4. Market Structures | 市场结构
Perfect competition features many firms, identical products, no barriers to entry, and perfect information. Firms are price takers. The ‘P’ in perfect competition stands for ‘Powerless’—no individual firm can influence the market price.
完全竞争的特征是许多企业、同质产品、无进入壁垒和完全信息。企业是价格接受者。完全竞争中的“P”代表“Powerless（无能为力）”——没有哪家企业能影响市场价格。
Monopoly exists when a single firm dominates the market, usually protected by high barriers to entry. The firm is a price maker. Think ‘M’ for monopoly as ‘Mighty’—it has significant market power. Be ready to contrast allocative and productive efficiency across structures.
当一家企业主导市场时，就存在垄断，通常受到高进入壁垒的保护。企业是价格制定者。把 monopoly 中的“M”想象成“Mighty（强大的）”——它拥有显著的市场力量。准备好对比不同市场结构下的配置效率和生产效率。
Oligopoly involves a few interdependent firms; collusion may lead to outcomes resembling monopoly. The kinked demand curve model explains price rigidity. Monopolistic competition blends many sellers with product differentiation, giving each firm a small degree of monopoly power.
寡头垄断涉及少数相互依存的企业；合谋可能导致类似垄断的结果。弯折的需求曲线模型解释了价格刚性。垄断竞争融合了许多卖方和产品差异化，赋予每家企业一小部分垄断力量。
5. Market Failure | 市场失灵
Market failure occurs when the free market allocates resources inefficiently. Externalities are costs or benefits affecting third parties. Negative externalities (e.g. pollution) cause overproduction; positive externalities (e.g. education) cause underproduction. Remember: ‘Negative = too much, positive = too little’.
当自由市场不能有效配置资源时，市场失灵就发生了。外部性是影响第三方的成本或收益。负外部性（如污染）导致生产过剩；正外部性（如教育）导致生产不足。记住：“Negative = too much（负即过多）, positive = too little（正即过少）”。
Public goods are non-excludable and non-rivalrous, leading to the free-rider problem. Think ‘Public goods are a Free Ride’—no one wants to pay. Merit goods are under-consumed due to imperfect information, while demerit goods are over-consumed.
公共物品具有非排他性和非竞争性，导致搭便车问题。想象“Public goods are a Free Ride（公共物品是免费搭车）”——没人愿意付费。优效品因信息不完全而消费不足，而劣效品则被过度消费。
Government intervention—taxes, subsidies, regulation, tradable permits—can correct market failure, but government failure may arise from imperfect information, unintended consequences, or administrative costs.
政府干预——税收、补贴、监管、可交易许可证——可以纠正市场失灵，但政府失灵可能源于信息不完善、意外后果或管理成本。
6. Macroeconomic Objectives | 宏观经济目标
Governments typically pursue four main objectives: sustainable economic growth, low and stable inflation, low unemployment, and a satisfactory balance of payments. Use the acronym ‘GIBU’ (Growth, Inflation, Balance of payments, Unemployment) to recall them quickly.
政府通常追求四个主要目标：可持续的经济增长、低且稳定的通货膨胀、低失业率以及令人满意的国际收支平衡。用首字母缩略词“GIBU”（增长、通胀、国际收支、失业）来快速记忆。
Economic growth is measured by the percentage change in real GDP. Inflation is a sustained increase in the general price level, commonly measured by the Consumer Price Index (CPI). Unemployment can be cyclical, structural, frictional, or seasonal.
经济增长通过实际 GDP 的百分比变化来衡量。通货膨胀是总体价格水平的持续上升，通常用消费者物价指数（CPI）衡量。失业分为周期性、结构性、摩擦性和季节性失业。
The balance of payments records all transactions between a country and the rest of the world. Its current account includes trade in goods, trade in services, primary income, and secondary income. A persistent deficit may signal structural weaknesses.
国际收支平衡表记录了一国与世界其他地区之间的所有交易。其经常账户包括货物贸易、服务贸易、初次收入和二次收入。持续的赤字可能表明结构性弱点。
7. Aggregate Demand and Supply | 总需求与总供给
Aggregate demand (AD) is the total spending on domestic goods and services, summarised by AD = C + I + G + (X − M). Think ‘CIGarette eXport iMport’—C, I, G, X, M stand for consumption, investment, government spending, exports and imports.
总需求（AD）是对国内商品和服务的总支出，用公式 AD = C + I + G + (X − M) 概括。用“CIGarette eXport iMport”来记忆——C、I、G、X、M 分别代表消费、投资、政府支出、出口和进口。
Short-run aggregate supply (SRAS) is upward sloping because at least one factor price is sticky. Long-run aggregate supply (LRAS) is vertical at the full-employment level of output, reflecting the economy’s productive potential. Shocks to SRAS (e.g. oil price rises) cause stagflation—falling output and rising prices.
短期总供给（SRAS）向上倾斜，因为至少有一种要素价格是粘性的。长期总供给（LRAS）在充分就业产出水平上呈垂直状，反映了经济的生产潜力。对 SRAS 的冲击（如油价上涨）会导致滞胀——产出下降而价格上升。
Macroeconomic equilibrium occurs where AD equals SRAS, determining the general price level and real output. The multiplier effect amplifies initial changes in spending, while the accelerator links investment to the rate of change of output.
宏观经济均衡发生在 AD 等于 SRAS 之处，决定了总体价格水平和实际产出。乘数效应放大了初始支出的变动，而加速数则将投资与产出的变化率联系起来。
8. Fiscal and Monetary Policy | 财政与货币政策
Fiscal policy involves government spending and taxation to influence the economy. Expansionary fiscal policy (higher G, lower T) boosts AD; contractionary fiscal policy does the opposite. Remember ‘Fiscal = Funds from the Treasury’.
财政政策涉及政府支出和税收以影响经济。扩张性财政政策（增加 G，减少 T）会提振 AD；紧缩性财政政策则相反。记住“Fiscal = Funds from the Treasury（财政即国库资金）”。
Monetary policy uses interest rates, money supply, and quantitative easing to achieve macroeconomic stability. A lower interest rate reduces the cost of borrowing, encouraging consumption and investment. The central bank operates monetary policy independently in many countries. ‘Money’ in monetary policy is your hint.
货币政策利用利率、货币供应量和量化宽松来实现宏观经济稳定。较低的利率降低了借贷成本，鼓励消费和投资。在许多国家，中央银行独立执行货币政策。“Monetary”中的“Money”就是提示。
Supply-side policies aim to increase LRAS by improving productivity and efficiency. Examples include education and training, tax reforms, and deregulation. Think ‘Supply-side = Shift LRAS to the right’.
供给侧政策旨在通过提高生产率和效率来增加 LRAS。例子包括教育和培训、税收改革以及放松管制。设想“Supply-side = Shift LRAS to the right（供给侧即向右移动 LRAS）”。
9. International Trade | 国际贸易
Comparative advantage states that countries should specialise in producing goods where they have the lowest opportunity cost, even if they lack an absolute advantage. The ‘C’ stands for ‘Cheapest opportunity cost’. Free trade based on comparative advantage can raise total world output.
比较优势理论指出，各国应专门生产机会成本最低的商品，即使它们没有绝对优势。“C”代表“Cheapest opportunity cost（最廉价的机会成本）”。基于比较优势的自由贸易可以提高全球总产出。
Protectionism—tariffs, quotas, subsidies to domestic producers, and non-tariff barriers—shields domestic industries but often leads to inefficiency and higher prices for consumers. An effective diagram to memorise is the tariff diagram showing welfare loss.
保护主义——关税、配额、对国内生产者的补贴以及非关税壁垒——保护了国内产业，但常常导致效率低下和消费者面临更高价格。一个需要记住的有效图表是显示福利损失的关税图。
Trading blocs like free trade areas, customs unions, and monetary unions promote regional integration. The EU single market is a deep example. Remember: ‘Free trade area’ has no internal barriers; ‘customs union’ adds a common external tariff.
像自由贸易区、关税同盟和货币联盟这样的贸易集团促进了区域一体化。欧盟单一市场就是一个深层例子。记住：“Free trade area（自由贸易区）”没有内部壁垒；“customs union（关税同盟）”增加了共同对外关税。
10. Exchange Rates | 汇率
An exchange rate is the price of one currency expressed in terms of another. Floating exchange rates are determined by market forces of demand and supply. Appreciation makes exports dearer and imports cheaper; depreciation does the reverse. Use ‘SPICED’: Strong Pound Imports Cheaper Exports Dearer.
汇率是用另一种货币表示的一种货币的价格。浮动汇率由市场供求力量决定。升值使出口更贵、进口更便宜；贬值则相反。使用“SPICED”：Strong Pound Imports Cheaper Exports Dearer（强英镑，进口便宜出口贵）。
Fixed exchange rates are pegged by the central bank, requiring intervention and foreign reserves. A managed float lies in between. Marshall-Lerner condition states that depreciation will only improve the current account if the sum of price elasticities of demand for exports and imports is greater than one.
固定汇率由中央银行钉住，需要干预和外汇储备。有管理的浮动介于两者之间。马歇尔-勒纳条件指出，只有当出口和进口的需求价格弹性之和大于 1 时，贬值才会改善经常账户。
11. Balance of Payments | 国际收支
The balance of payments is a systematic record of all economic transactions between residents of a country and the rest of the world. Its two main accounts are the current account and the financial/capital account. For the whole balance of payments to balance, a current account deficit must be matched by a financial account surplus.
国际收支平衡表是对一国居民与世界其他地区之间所有经济交易的系统记录。它的两个主要账户是经常账户和金融/资本账户。为使整个国际收支平衡，经常账户赤字必须由金融账户盈余来弥补。
Causes of current account imbalances include structural uncompetitiveness, high domestic demand, overvalued exchange rates, and supply-side weaknesses. Policies to correct deficits include expenditure-switching (tariffs, devaluation) and expenditure-reducing (contractionary fiscal/monetary policies).
经常账户失衡的原因包括结构性竞争力不足、国内需求过高、汇率高估以及供给侧弱点。纠正赤字的政策包括支出转换政策（关税、贬值）和支出削减政策（紧缩性财政/货币政策）。
12. Development Economics | 发展经济学
Economic development goes beyond growth in GDP; it encompasses improvements in living standards, health, education, and political freedom. The Human Development Index (HDI) combines life expectancy, education, and income per capita. Remember: ‘Development is a broader Story than growth’.
经济发展超越了 GDP 增长；它涵盖了生活水平、健康、教育和政治自由的改善。人类发展指数（HDI）综合了预期寿命、教育和人均收入。记住：“Development is a broader Story than growth（发展比增长有更宽广的故事）”。
Barriers to development include inadequate capital, poor infrastructure, debt burdens, corruption, and poor governance. Strategies such as microfinance, foreign aid, trade liberalisation, and industrial policy can help break the cycle of poverty.
发展的障碍包括资本不足、基础设施薄弱、债务负担、腐败和治理不善。小额信贷、对外援助、贸易自由化和产业政策等战略有助于打破贫困的恶性循环。
The Pre-U syllabus expects you to evaluate these strategies, recognising that no single approach works for all countries. Sustainable development also highlights environmental constraints, linking back to basic concepts of scarcity and choice.
Pre-U 课程要求你对这些策略进行评估，认识到没有一种方法适用于所有国家。可持续发展也突出了环境制约，与稀缺和选择的基本概念相联系。
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