📚 Pre-U CCEA Economics: A Quick Guide to Key Vocabulary and Terminology | Pre-U CCEA 经济：词汇术语速记指南
Mastering economics begins with a firm grasp of its language. For CCEA Pre-U students, the ability to define, apply, and analyse key terms is the foundation of high-scoring essays and data responses. This guide presents essential vocabulary clusters, memory aids, and concise dual-language explanations designed to accelerate your revision and deepen your understanding. Each entry connects a precise English definition with its Chinese equivalent, framed within the CCEA specification's emphasis on critical evaluation.
掌握经济学始于对其语言的牢固掌握。对于 CCEA Pre-U 学生而言，定义、应用和分析关键术语的能力是高分论文与数据回应题的基础。本指南呈现了核心词汇群、记忆辅助工具以及精炼的双语解释，旨在加速你的复习进度并加深理解。每个条目都将精确的英文定义与中文对应语相连接，并置于 CCEA 大纲强调批判性评估的框架中。
1. The Central Economic Problem: Scarcity and Choice | 中心经济问题：稀缺性与选择
The fundamental economic problem arises because resources are finite while human wants are infinite. Scarcity forces individuals, firms, and governments to make choices, each incurring an opportunity cost — the value of the next best alternative forgone. CCEA examiners expect you to use this concept as a lens through which all other topics are viewed.
根本的经济问题源于资源的有限性与人类欲望的无限性。稀缺性迫使个人、企业和政府做出选择，每一个选择都产生机会成本——即所放弃的次优替代品的价值。CCEA 考官期望你将这一概念作为审视所有其他主题的透镜。
- Scarcity — the condition of limited resources relative to unlimited wants. | 稀缺性——相对于无限欲望而言资源有限的状态。
- Opportunity Cost — the next best alternative sacrificed when a choice is made. | 机会成本——做出选择时所牺牲的次优替代方案。
- Free Good — a good with zero opportunity cost (e.g., air, sunlight). | 免费物品——机会成本为零的物品（如空气、阳光）。
- Economic Good — a good that commands a price due to its scarcity. | 经济物品——因稀缺而具有价格的物品。
2. Production Possibility Frontiers and Efficiency | 生产可能性边界与效率
A Production Possibility Frontier (PPF) illustrates the maximum combinations of two goods an economy can produce with given resources and technology. Points on the curve represent productive efficiency; points inside indicate unemployment or inefficiency. An outward shift signifies economic growth, a core dynamic in CCEA macro questions.
生产可能性边界（PPF）展示了一个经济体在既定资源与技术下能够生产的两种商品的最大组合。曲线上的点代表生产效率；曲线内的点则表明失业或低效率。整条曲线向外移动意味着经济增长，这是 CCEA 宏观问题中的核心动态。
- Productive Efficiency — producing at the lowest possible cost on the PPF. | 生产效率——在 PPF 上以尽可能最低的成本进行生产。
- Allocative Efficiency — producing the mix of goods most desired by society, where P = MC. | 配置效率——生产社会最需要的商品组合，满足 P = MC。
- Capital Goods — goods used to produce other goods; investment in these shifts the PPF outward. | 资本品——用于生产其他商品的物品；对资本品的投资使 PPF 向外移动。
- Consumer Goods — goods directly satisfying wants. | 消费品——直接满足欲望的物品。
3. Demand, Supply and Market Equilibrium | 需求、供给与市场均衡
The price mechanism coordinates the decisions of buyers and sellers. The law of demand states that, ceteris paribus, a rise in price contracts quantity demanded. The law of supply holds that a rise in price expands quantity supplied. Equilibrium occurs where quantity demanded equals quantity supplied, with market disequilibrium leading to surpluses or shortages. CCEA questions frequently demand analysis of shifts versus movements along these curves.
价格机制协调着买卖双方的决策。需求定律指出，其他条件不变时，价格上涨将缩减需求量。供给定律认为，价格上涨将扩大供给量。均衡发生在需求量等于供给量之处，市场非均衡则导致过剩或短缺。CCEA 试题经常要求分析曲线的平移与沿着曲线的移动之间的区别。
- Ceteris Paribus — the assumption of 'all other things being equal'. | 其他条件不变——“所有其他条件均相同”的假设。
- Effective Demand — desire backed by ability to pay. | 有效需求——有支付能力支撑的欲望。
- Joint Supply — when producing one good automatically yields another (e.g., beef and leather). | 联合供给——生产一种商品时必然产生另一种商品（如牛肉与皮革）。
- Composite Demand — when a good is demanded for multiple uses (e.g., crude oil). | 复合需求——一种商品有多种用途的需求（如原油）。
4. Elasticity: Measuring Responsiveness | 弹性：衡量反应程度
Elasticities quantify the responsiveness of one variable to changes in another. Price elasticity of demand (PED) measures how quantity demanded reacts to price changes; income elasticity (YED) tracks responses to income shifts; cross-price elasticity (XED) captures reactions to other goods' prices. Price elasticity of supply (PES) examines producers' responsiveness. CCEA candidates must calculate, interpret, and evaluate the significance of these coefficients for firms and governments.
弹性量化了一个变量对另一变量变化的反应程度。需求的价格弹性（PED）衡量需求量对价格变化的反应；收入弹性（YED）追踪需求对收入变动的反应；交叉价格弹性（XED）捕捉对其它商品价格的反应。供给的价格弹性（PES）则考察生产者的反应程度。CCEA 考生必须计算、解读并评估这些系数对企业和政府的重要性。
PED = %Δ Quantity Demanded ÷ %Δ Price
- PED < 1 — inelastic demand; total revenue rises with price increases. | PED < 1——缺乏弹性；价格上升时总收益增加。
- PED > 1 — elastic demand; total revenue falls with price increases. | PED > 1——富有弹性；价格上升时总收益减少。
- YED < 0 — inferior good (demand falls as income rises). | YED < 0——劣等品（收入上升时需求下降）。
- XED > 0 — substitutes; XED < 0 — complements. | XED > 0——替代品；XED < 0——互补品。
5. Market Failure and Government Intervention | 市场失灵与政府干预
Market failure occurs when the price mechanism fails to allocate resources efficiently, leading to a net social welfare loss. Externalities, public goods, information asymmetries, and monopoly power are key sources. CCEA requires students to diagram negative and positive externalities and to evaluate policies such as taxation, subsidies, tradable permits, and regulation.
当价格机制未能有效配置资源并导致净社会福利损失时，便发生市场失灵。外部性、公共物品、信息不对称和垄断势力是其主要来源。CCEA 要求学生用图示分析负外部性与正外部性，并评估税收、补贴、可交易许可证及管制等政策。
- External Cost — a cost borne by third parties not compensated (e.g., pollution). | 外部成本——未获补偿的第三方所承担的成本（如污染）。
- External Benefit — a benefit enjoyed by third parties without payment (e.g., vaccination). | 外部收益——无需付费即被第三方享有的收益（如疫苗接种）。
- Public Good — non-rival and non-excludable; likely underprovided by the free market. | 公共物品——非竞争性和非排他性；自由市场可能供给不足。
- Pigouvian Tax — a tax set equal to the marginal external cost to internalise the externality. | 庇古税——一种设定为等于边际外部成本的税收，以将外部性内部化。
- Government Failure — when intervention worsens the allocation of resources. | 政府失灵——当干预使资源配置恶化时。
6. Costs, Revenues and Market Structures | 成本、收益与市场结构
Firms' objectives and behaviour depend on cost structures and market power. Distinguishing between short-run and long-run cost curves, and understanding the revenue concepts of average and marginal revenue, is essential. CCEA questions on perfect competition, monopoly, oligopoly, and monopolistic competition demand diagrammatic analysis and critical discussion of efficiency and welfare.
企业的目标与行为取决于成本结构和市场势力。区分短期与长期成本曲线，并理解平均收益与边际收益这两个收入概念至关重要。CCEA 关于完全竞争、垄断、寡头垄断和垄断竞争的考题，要求进行图示分析并就效率与福利展开批判性讨论。
| Fixed Cost | Cost that does not vary with output in the short run. | 短期内不随产量变动的成本。 |
| Variable Cost | Cost that changes directly with the level of output. | 直接随产量水平变化的成本。 |
| Marginal Cost | The addition to total cost from producing one extra unit. | 多生产一单位产品所带来的总成本增加量。 |
| Barriers to Entry | Obstacles that prevent new firms from entering a market (e.g., high sunk costs, legal patents). | 阻止新企业进入市场的障碍（如高沉没成本、法律专利）。 |
| Contestable Market | A market with low entry and exit barriers, even if highly concentrated. | 即便高度集中，但进入与退出壁垒较低的市场。 |
7. Macroeconomic Objectives and Indicators | 宏观经济目标与指标
Governments typically pursue stable economic growth, low unemployment, low and stable inflation, and a sustainable balance of payments. CCEA candidates must define, measure, and critically assess these objectives, including the limitations of indicators such as GDP, CPI, and the claimant count.
政府通常追求稳定的经济增长、低失业率、低位且稳定的通货膨胀以及可持续的国际收支平衡。CCEA 考生必须定义、衡量并批判性地评估这些目标，包括对 GDP、CPI 及申领失业金人数等指标局限性的认识。
- Gross Domestic Product (GDP) — the market value of all final goods and services produced within an economy in a year. | 国内生产总值（GDP）——一个经济体内一年生产的所有最终物品与服务的市场价值。
- Real vs. Nominal GDP — real GDP is adjusted for inflation to reflect true output. | 实际 GDP 与名义 GDP——实际 GDP 已根据通胀进行调整以反映真实产出。
- Consumer Price Index (CPI) — a weighted index tracking changes in the price level of a typical basket of goods. | 消费者价格指数（CPI）——追踪一篮子典型商品价格水平变化的加权指数。
- Balance of Payments Current Account — records trade in goods, services, primary income and secondary income. | 国际收支经常账户——记录货物、服务、初次收入和二次收入的贸易。
8. Aggregate Demand and Aggregate Supply | 总需求与总供给
+ G + (X - M)) represents total planned expenditure. Aggregate supply reflects the economy' ply (SRAS and LRAS) is vital, as is analysing supply-side shocks and demand-side policies.
AD/AS 模型是 CCEA 宏观经济学的核心分析工具。总需求（AD = C + I + G + (X - M)）代表总计划支出。总供给反映了经济的生产潜力。区分短期总供给（SRAS）与长期总供给（LRAS）至关重要，分析供给冲击与需求侧政策也同样关键。
- Consumption (C) — spending by households on goods and services, determined largely by disposable income and wealth. | 消费（C）——家庭在物品与服务上的支出，主要由可支配收入与财富决定。
- Investment (I) — spending on capital goods; influenced by interest rates, business confidence, and the accelerator. | 投资（I）——在资本品上的支出；受利率、企业信心和加速器效应影响。
- Multiplier Effect — when an initial injection leads to a larger final increase in national income. | 乘数效应——初始注入导致国民收入出现更大最终增幅的现象。
- LRAS Shift — caused by changes in the quantity/quality of factors of production or technological progress. | LRAS 移动——由生产要素数量/质量的变化或技术进步引起。
AD = C + I + G + (X - M)
9. Fiscal and Monetary Policy Instruments | 财政与货币政策工具
CCEA Pre-U demands familiarity with the full policy toolkit. Fiscal policy manipulates government spending and taxation; monetary policy adjusts interest rates, money supply, and the exchange rate. Supply-side policies aim to shift LRAS rightward. Evaluation must consider lags, crowding out, the liquidity trap, and the effectiveness of automatic stabilisers versus discretionary measures.
CCEA Pre-U 要求熟悉完整的政策工具箱。财政政策调控政府支出与税收；货币政策调整利率、货币供给和汇率。供给侧政策旨在将 LRAS 向右移动。评估时必须考虑时滞、挤出效应、流动性陷阱以及自动稳定器相对于相机抉择措施的有效性。
- Progressive Tax — average tax rate rises as income rises. | 累进税——平均税率随收入上升而上升。
- Regressive Tax — average tax rate falls as income rises. | 累退税——平均税率随收入上升而下降。
- Quantitative Easing (QE) — central bank purchases of assets to inject liquidity and lower long-term yields. | 量化宽松（QE）——央行购买资产以注入流动性并压低长期收益率。
- Automatic Stabilisers — features of the tax and welfare system that offset economic fluctuations without policy changes. | 自动稳定器——税收和福利体系中无需政策变更即可抵消经济波动的特性。
10. International Trade and Globalisation | 国际贸易与全球化
The theory of comparative advantage explains trade patterns, but CCEA requires students to weigh its assumptions against real-world complexities. Trade liberalisation, protectionism, and integration stages — from free trade areas to monetary unions — must be evaluated. Terms of trade and their determinants also feature prominently.
比较优势理论解释了贸易格局，但 CCEA 要求学生将其假设与现实世界的复杂性进行权衡。贸易自由化、保护主义以及一体化阶段——从自由贸易区到货币联盟——都必须予以评估。贸易条件及其决定因素也占据突出位置。
- Comparative Advantage — ability to produce a good at a lower opportunity cost than another producer. | 比较优势——以低于另一生产者的机会成本生产一种商品的能力。
- Tariff — a tax on imported goods. | 关税——对进口商品征收的税。
- Terms of Trade — f export prices relative to import prices (export price index ÷ import price index × 100). | 贸易条件——出口价格相对于进口价格的指数（出口价格指数 ÷ 进口价格指数 × 100）。
- Foreign Direct Investment (FDI) — investment by multinational firms in productive assets located abroad. | 外商直接投资（FDI）——跨国公司在海外生产性资产上的投资。
11. Exchange Rates and Balance of Payments Adjustment | 汇率与国际收支调整
Exchange rate systems — floating, fixed, and managed — generate different adjustment mechanisms for current account deficits. The Marshall-Lerner condition and J-curve effect are required theoretical details. CCEA essays on currency depreciation often require an analysis of both expenditure-switching and expenditure-reducing policies.
汇率制度——浮动、固定和有管理浮动——为经常账户赤字产生了不同的调整机制。马歇尔-勒纳条件与 J 曲线效应是必备的理论细节。CCEA 关于货币贬值的论文通常需要同时分析支出转换政策与支出减少政策。
- Floating Exchange Rate — determined solely by market forces of demand and supply. | 浮动汇率——完全由市场供求力量决定。
- Marshall-Lerner Condition — depreciation improves the current account only if |PED exports + PED imports| > 1. | 马歇尔-勒纳条件——仅当 |出口PED + 进口PED| > 1 时，贬值才会改善经常账户。
- Hot Money Flows — short-term capital moving between countries to exploit interest rate differences. | 热钱流动——利用利率差异在各国间流动的短期资本。
- Expenditure-Reducing Policy — deflationary fiscal or monetary measures to lower import demand. | 支出减少政策——抑制进口需求的紧缩性财政或货币措施。
12. Development Economics and Inequality | 发展经济学与不平等
Economic development extends beyond GDP growth to encompass health, education, and human freedom. The Human Development Index (HDI), the Lorenz curve, and the Gini coefficient are measurement staples. CCEA candidates must analyse barriers to development — such as debt, corruption, and primary product dependency — and critically debate the effectiveness of aid versus trade reforms.
经济发展超出了 GDP 增长的范畴，涵盖健康、教育和人类自由。人类发展指数（HDI）、洛伦兹曲线和基尼系数是主要的衡量工具。CCEA 考生必须分析发展障碍——如债务、腐败和初级产品依赖——并就援助与贸易改革的有效性展开批判性辩论。
- Human Development Index (HDI) — a composite measure of life expectancy, education, and per capita income. | 人类发展指数（HDI）——衡量预期寿命、教育和人均收入的综合指标。
- Lorenz Curve — graphical representation of income distribution; the further from the line of equality, the greater the inequality. | 洛伦兹曲线——收入分配的图形表示；偏离均等线越远，不平等程度越高。
- Gini Coefficient — a numerical measure between 0 (perfect equality) and 1 (perfect inequality). | 基尼系数——介于 0（完全均等）和 1（完全不均等）之间的数值衡量。
- Microfinance — small-scale loans to entrepreneurs in developing countries, fostering grassroots growth. | 小额信贷——向发展中国家的企业家提供的小规模贷款，促进基层增长。
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