📚 IGCSE CIE Economics: Last-Minute Revision Notes | IGCSE CIE 经济：考前冲刺笔记
Welcome to your last-minute revision guide for IGCSE CIE Economics. This article distils the entire syllabus into concise, bilingual notes to help you recall key concepts, definitions, diagrams, and policies before the exam. Every point is presented in English followed by its Chinese equivalent so you can memorise both language versions side by side.
欢迎使用 IGCSE CIE 经济考前冲刺指南。本文将整个教学大纲浓缩为简洁的中英双语笔记，帮助你在考前快速回忆关键概念、定义、图表和政策。每个要点均以英文后接中文的形式呈现，便于你平行记忆两种语言。
1. The Basic Economic Problem and Factors of Production | 基本经济问题与生产要素
The fundamental economic problem is scarcity: unlimited human wants but limited productive resources. This forces economic agents to make choices, each of which involves an opportunity cost (the next best alternative forgone).
基本经济问题是稀缺性：无限的欲望与有限的生产资源。这迫使经济主体做出选择，而每一次选择都涉及机会成本（所放弃的次优选择）。
The four factors of production are land (natural resources, reward is rent), labour (human effort, reward is wages), capital (man-made producer goods, reward is interest) and enterprise (risk-taking and organisation, reward is profit).
四种生产要素是土地（自然资源，回报为地租）、劳动（人力，回报为工资）、资本（人造生产工具，回报为利息）和企业（承担风险与组织，回报为利润）。
Goods are either free goods (unlimited supply, no opportunity cost) or economic goods (scarce, positive opportunity cost). Most goods we study are economic goods.
商品分为自由物品（供应无限，无机会成本）和经济物品（稀缺，有机会成本）。我们学习的大多数商品都是经济物品。
2. Opportunity Cost and Production Possibility Curve | 机会成本与生产可能性曲线
Opportunity cost is the value of the next best alternative sacrificed when a choice is made. It is not simply monetary cost; it includes all alternatives forgone.
机会成本是指做出一种选择时所牺牲的次优选项的价值。它不仅包括货币成本，还包括所有被放弃的替代方案。
A Production Possibility Curve (PPC) shows the maximum combinations of two goods an economy can produce with full and efficient use of given resources and technology. Points inside the PPC represent inefficient use; points on the curve are efficient; points outside are unattainable.
生产可能性曲线（PPC）展示一个经济体在充分利用给定资源和技术时，所能生产的两种商品的最大组合。曲线内的点代表无效率，曲线上的点是有效率的，曲线外的点无法实现。
The shape of the PPC can be concave (increasing opportunity cost) due to factors not being equally suited to all production, or a straight line (constant opportunity cost). Shifts outward are caused by an increase in the quantity or quality of resources, or improvements in technology.
PPC 的形状可能是凹向原点（机会成本递增），因为要素并非同等适合各种生产；也可能是直线（机会成本不变）。向外移动是由于资源数量或质量的增加，或技术进步。
3. Demand, Supply and Market Equilibrium | 需求、供给与市场均衡
The law of demand states that, ceteris paribus, as price falls, quantity demanded rises (inverse relationship). A change in price causes a movement along the demand curve, while changes in other factors (income, tastes, prices of related goods, etc.) shift the entire curve.
需求定律指出，在其他条件不变的情况下，价格下降，需求量增加（反向关系）。价格变动引起沿需求曲线的移动，而其他因素（收入、偏好、相关商品价格等）的变化会移动整条曲线。
The law of supply shows a direct relationship between price and quantity supplied. Factors shifting supply include costs of production, technology, taxes, subsidies and the number of firms.
供给定律表明价格与供给量之间存在正向关系。移动供给曲线的因素包括生产成本、技术、税收、补贴和企业数量。
Market equilibrium occurs where demand equals supply. Excess demand pushes prices up, while excess supply pushes prices down until equilibrium is restored.
市场均衡出现在需求等于供给时。超额需求会推高价格，超额供给会压低价格，直到重新达到均衡。
4. Elasticities: PED, PES, YED, XED | 弹性：需求价格弹性、供给价格弹性、收入弹性、交叉弹性
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price. PED = (%Δ Quantity Demanded) ÷ (%Δ Price). Its main determinants are the availability of substitutes, necessity, proportion of income spent, and time period.
需求价格弹性（PED）衡量需求量对价格变化的反应程度。PED =（需求量变动百分比）÷（价格变动百分比）。其主要决定因素包括替代品的可得性、必要性、占收入的比例和时间期间。
The relationship with total revenue: if demand is elastic, a price cut raises revenue; if inelastic, a price cut lowers revenue. This helps firms make pricing decisions.
与总收益的关系：如果需求富有弹性，降价会增加总收益；如果缺乏弹性，降价会减少总收益。这有助于企业的定价决策。
Price elasticity of supply (PES) measures the responsiveness of quantity supplied to a change in price. Key determinants are production time, spare capacity, stock levels and the ease of factor mobility.
供给价格弹性（PES）衡量供给量对价格变化的反应程度。关键决定因素包括生产时间、闲置产能、库存水平以及要素流动性。
Income elasticity of demand (YED) = (%Δ Quantity Demanded) ÷ (%Δ Income). Normal goods have positive YED; inferior goods have negative YED. Luxury goods have YED > 1.
需求收入弹性（YED）=（需求量变动百分比）÷（收入变动百分比）。正常商品的 YED 为正，劣质商品的 YED 为负。奢侈品 YED 大于 1。
Cross elasticity of demand (XED) = (%Δ Quantity Demanded of good A) ÷ (%Δ Price of good B). Substitutes have positive XED, complements have negative XED.
需求交叉弹性（XED）=（A 商品需求量变动百分比）÷（B 商品价格变动百分比）。替代品的 XED 为正，互补品的 XED 为负。
| Elasticity | Value Range | Description (En / Cn) |
|---|---|---|
| PED | 0 < PED < 1 | Inelastic / 缺乏弹性 |
| PED > 1 | Elastic / 富有弹性 | |
| PED = 1 | Unit elastic / 单位弹性 | |
| PES | 0 < PES < 1 | Inelastic / 缺乏弹性 |
| PES > 1 | Elastic / 富有弹性 |
5. Market Failure: Externalities and Public Goods | 市场失灵：外部性与公共物品
Market failure occurs when the free market fails to allocate resources efficiently, resulting in overproduction or underproduction. The main causes are externalities, public goods, merit and demerit goods, and information gaps.
市场失灵指自由市场无法有效配置资源，导致生产过多或过少。主要原因包括外部性、公共物品、有益品和有害品以及信息不对称。
A negative externality is a cost imposed on a third party (e.g., pollution from a factory). This leads to overproduction because producers ignore external costs. A positive externality is a benefit to a third party (e.g., vaccination), leading to underproduction.
负外部性是指施加给第三方的成本（如工厂污染）。这导致生产过剩，因为生产者忽视外部成本。正外部性是指给第三方带来的好处（如疫苗接种），导致生产不足。
Public goods are non-rival (one person’s consumption does not reduce availability) and non-excludable (impossible to stop free riders). Examples are street lighting and national defence. The free market fails to provide them, so government provision is often needed.
公共物品具有非竞争性（一个人的消费不会减少他人的可用性）和非排他性（无法阻止搭便车者）。例子包括路灯和国防。自由市场无法提供，因此常常需要政府介入。
6. Government Intervention and Market Correction | 政府干预与市场纠正
To correct negative externalities, governments can impose indirect taxes (e.g., carbon taxes) to internalise the externality, raising private costs to equal social costs. This reduces output to the socially optimal level.
为纠正负外部性，政府可以征收间接税（如碳税）使外部成本内部化，让私人成本等于社会成本，从而将产量降至社会最优水平。
For positive externalities, subsidies can be given to increase consumption or production. For example, education subsidies raise the private benefit to match the social benefit.
对于正外部性，可提供补贴以增加消费或生产。例如教育补贴提高私人收益使之匹配社会收益。
Other interventions include maximum prices (ceilings) to protect consumers from high prices, minimum prices (floors) to support producers, regulations (e.g., banning smoking in public), information campaigns and direct state provision of public goods.
其他干预措施包括最高限价保护消费者、最低限价支持生产者、法规（如公共场所禁烟）、信息宣传以及政府直接提供公共物品。
However, government failure can occur if intervention leads to unintended consequences, such as black markets under price ceilings or excessive compliance costs.
然而，如果干预导致意外后果，如限价下的黑市或过高的合规成本，就可能出现政府失灵。
7. Macroeconomic Objectives and Indicators | 宏观经济目标与指标
Governments typically pursue four main macroeconomic objectives: sustainable economic growth, low and stable inflation (price stability), low unemployment (full employment), and a satisfactory balance of payments position. Some also aim for more equal income distribution.
政府通常追求四大宏观经济目标：可持续的经济增长、低且稳定的通货膨胀（物价稳定）、低失业（充分就业）以及良好的国际收支状况。有些还追求更公平的收入分配。
Key indicators include GDP (and GDP per capita) for economic growth, the Consumer Price Index (CPI) for inflation, the unemployment rate (claimant count or Labour Force Survey), and the current account balance for external stability.
关键指标包括衡量经济增长的 GDP（及人均 GDP）、衡量通胀的消费者价格指数（CPI）、失业率（申领失业金人数或劳动力调查）以及衡量外部稳定的经常账户余额。
8. Aggregate Demand and Aggregate Supply | 总需求与总供给
Aggregate Demand (AD) is the total spending on goods and services in an economy: AD = C + I + G + (X – M). C is consumption, I is investment, G is government spending, X is exports and M is imports. A fall in any component shifts AD left; a rise shifts AD right.
总需求（AD）是一个经济体内对商品和服务的总支出：AD = C + I + G +（X – M）。C 为消费，I 为投资，G 为政府支出，X 为出口，M 为进口。任何一个组成部分的下降会使 AD 左移，上升则右移。
Short-run aggregate supply (SRAS) shows the total output firms are willing to supply at different price levels, assuming some input costs are sticky. It shifts right with lower costs of production, subsidies or better technology. Long-run aggregate supply (LRAS) represents full-employment output and shifts right with increases in the quantity/quality of resources.
短期总供给（SRAS）显示在不同价格水平下企业愿意提供的总产出，假设部分投入成本具有粘性。生产成本降低、补贴或技术进步使 SRAS 右移。长期总供给（LRAS）代表充分就业产出，随资源数量或质量提升而右移。
Macroeconomic equilibrium is where AD = SRAS. If AD increases in the short run, both real GDP and the price level rise. Supply-side improvements can increase output without raising the price level.
宏观经济均衡点位于 AD = SRAS 处。如果短期内 AD 增加，实际 GDP 和物价水平都会上升。供给侧的改善可以在不推高价格的前提下增加产出。
9. Fiscal Policy and Monetary Policy | 财政政策与货币政策
Fiscal policy involves government manipulation of spending and taxation to influence the economy. Expansionary fiscal policy (higher G, lower T) boosts AD and can reduce unemployment, but risks inflation. Contractionary policy (lower G, higher T) cools an overheated economy.
财政政策通过调整政府支出和税收来影响经济。扩张性财政政策（增加 G、减税）会提振 AD，降低失业，但可能引发通胀。紧缩性政策（减少 G、增税）为过热经济降温。
Monetary policy uses interest rates, money supply and credit controls by the central bank. Lower interest rates encourage borrowing and spending, raising AD. Higher rates reduce AD to control inflation. The main tools are the base rate, open market operations and reserve requirements.
货币政策由中央银行运用利率、货币供应和信贷控制。降低利率能鼓励借贷和支出，提升 AD；提高利率则抑制 AD 以控制通胀。主要工具包括基准利率、公开市场操作和准备金要求。
10. Supply-Side Policies | 供给面政策
Supply-side policies aim to increase the productive capacity of the economy (shift LRAS right). They focus on improving the quality and quantity of factors of production and efficiency.
供给面政策旨在提高经济体的生产能力（使 LRAS 右移），侧重于改善生产要素的质量和数量以及提升效率。
Examples include education and training to improve labour skills, tax reforms to incentivise work and investment, privatisation and deregulation to increase competition, and reducing trade union power to improve labour market flexibility.
例子包括通过教育和培训提高劳动技能、税制改革激励工作与投资、私有化和放松管制以促进竞争，以及降低工会
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