📚 IGCSE AQA Economics: Last-Minute Revision Notes | IGCSE AQA 经济：考前冲刺笔记
This revision guide distils the core topics of the IGCSE AQA Economics specification into concise, exam-focused notes. Use it to refresh key definitions, diagrams, and chains of reasoning quickly before your exam. Each section presents essential points in clear bilingual pairings, helping you bridge English terminology with Chinese understanding.
这份复习指南将 IGCSE AQA 经济学大纲的核心主题浓缩为简洁、瞄准考点的笔记。考前可用它快速重温关键定义、图表和推理链条。每个部分以清晰的双语配对呈现要点，帮助你融汇英文术语与中文理解。
1. Scarcity and Choice | 稀缺性与选择
The basic economic problem arises because resources are finite while human wants are unlimited. This forces individuals, firms, and governments to make choices, each involving an opportunity cost — the next best alternative forgone.
基本经济问题源于资源有限而人的欲望无限。这迫使个人、企业和政府做出选择，每次选择都涉及机会成本——所放弃的次优替代选项。
Production possibility frontier (PPF) diagrams illustrate maximum output combinations of two goods given fixed resources. Points inside the curve show inefficiency, points on the curve show full employment, and outward shifts represent economic growth.
生产可能性边界（PPF）图展示了在资源固定时两种商品的最大产出组合。曲线内的点表示无效率，曲线上的点表示充分就业，曲线外移代表经济增长。
Factors of production are land (natural resources), labour (workforce), capital (man-made tools) and enterprise (risk-taking organisation). Their quality influences a country’s productive capacity.
生产要素包括土地（自然资源）、劳动力（工人）、资本（人造工具）和企业家精神（承担风险的组织）。它们的质量影响一国的生产能力。
2. Demand and Supply | 需求与供给
The law of demand states that, ceteris paribus, as price rises, quantity demanded falls. Demand curves slope downwards. A movement along the curve is caused by a change in price; a shift is caused by non-price factors such as income, tastes, or prices of related goods.
需求定律指在其他条件不变时，价格上升则需求量下降。需求曲线向下倾斜。价格变化导致沿曲线移动；非价格因素如收入、偏好、相关商品价格则导致曲线平移。
The law of supply states that as price rises, quantity supplied rises. Supply curves slope upwards. Shifts result from changes in costs of production, technology, indirect taxes or subsidies, and the number of sellers.
供给定律指价格上升，供给量上升。供给曲线向上倾斜。生产成本、技术、间接税或补贴、卖方数量等变化会导致曲线平移。
Market equilibrium occurs where demand equals supply, giving the equilibrium price and quantity. Disequilibrium leads to excess supply (surplus) or excess demand (shortage), causing prices to adjust towards equilibrium.
市场均衡发生在需求等于供给之处，形成均衡价格和数量。非均衡会导致超额供给（过剩）或超额需求（短缺），促使价格向均衡调整。
3. Elasticity | 弹性
Price elasticity of demand (PED) measures responsiveness of quantity demanded to a price change: PED = (%ΔQd) / (%ΔP). If |PED| > 1, demand is elastic; if < 1, inelastic; if = 1, unit elastic. Elasticity affects total revenue.
需求价格弹性（PED）衡量需求量对价格变化的反应度：PED = （%ΔQd）/（%ΔP）。若 |PED| > 1，需求有弹性；若 < 1，缺乏弹性；若 = 1，单位弹性。弹性影响总收益。
Price elasticity of supply (PES) measures responsiveness of quantity supplied: PES = (%ΔQs) / (%ΔP). Key determinants include time period, spare capacity, and stock levels. Income elasticity of demand (YED) shows how demand changes with income; normal goods have positive YED, inferior goods negative YED.
供给价格弹性（PES）衡量供给量的反应度：PES = （%ΔQs）/（%ΔP）。关键决定因素包括时间长短、闲置产能和库存水平。需求收入弹性（YED）表明需求如何随收入变化；正常品 YED 为正，低档品 YED 为负。
Cross elasticity of demand (XED) measures the change in demand for one good when the price of another changes. Positive XED indicates substitutes, negative XED indicates complements.
需求交叉弹性（XED）衡量一种商品需求对另一种商品价格变化的反应度。XED 为正表示替代品，为负表示互补品。
4. Market Failure | 市场失灵
Market failure occurs when the free market fails to allocate resources efficiently, leading to a net welfare loss. Key causes include 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，导致净福利损失。主要成因包括外部性、公共品、优值品与劣值品及信息不对称。
Negative production externalities (e.g. factory pollution) cause social cost > private cost. Negative consumption externalities (e.g. passive smoking) cause social benefit < private benefit. Positive externalities (e.g. education, vaccinations) imply social benefit > private benefit, leading to under-consumption if left to the market.
负生产外部性（如工厂污染）导致社会成本 > 私人成本。负消费外部性（如二手烟）导致社会收益 < 私人收益。正外部性（如教育、疫苗）意味着社会收益 > 私人收益，若由市场提供将导致消费不足。
Public goods are non-excludable and non-rival, leading to the free-rider problem; they would not be provided by the market. Merit goods are under-consumed due to information failure or positive externalities; demerit goods are over-consumed due to negative externalities or poor information.
公共品具有非排他性和非竞争性，引发搭便车问题，市场不会提供。优值品因信息不对称或正外部性而消费不足；劣值品因负外部性或信息不畅而过度消费。
5. Government Intervention in Markets | 政府对市场的干预
To correct market failure, governments can impose indirect taxes (shifting supply left, raising price and reducing quantity of demerit goods), or grant subsidies (shifting supply right, lowering price and increasing quantity of merit goods).
为纠正市场失灵，政府可征收间接税（使供给曲线左移，提高价格并减少劣值品数量），或提供补贴（使供给曲线右移，降低价格并增加优值品数量）。
Maximum price (price ceiling) is set below equilibrium to protect consumers; it creates excess demand. Minimum price (price floor) is set above equilibrium to support producers or workers; it creates excess supply. Minimum wage is a common example.
最高限价（价格上限）设在均衡价格之下以保护消费者，会造成超额需求。最低限价（价格下限）设在均衡之上以支持生产者或工人，会造成超额供给。最低工资是常见例子。
Regulation and legislation (e.g. bans on smoking in public places, emission limits) directly control behaviour. Tradable pollution permits create a market for emissions, incentivising firms to cut pollution at lowest cost.
法规与立法（如公共场合禁烟、排放限制）直接控制行为。可交易污染许可证为排放创造市场，激励企业以最低成本减少污染。
6. Production, Costs and Productivity | 生产、成本与生产率
Productivity measures output per unit of input. Labour productivity = output per worker per hour. Higher productivity reduces average costs and can raise wages without causing cost-push inflation.
生产率衡量每单位投入的产出。劳动生产率 = 每工人每小时产出。更高生产率降低平均成本，并可在不引发成本推动型通胀的情况下提高工资。
Specialisation and the division of labour increase efficiency by allowing workers to focus on specific tasks. However, over-specialisation can lead to boredom and loss of flexibility. Firms grow to exploit economies of scale, which lower long-run average costs.
专业化和劳动分工通过让工人专注特定任务来提高效率。但过度专业化可能导致枯燥和失去灵活性。企业成长以利用规模经济，降低长期平均成本。
Internal economies of scale include technical, purchasing, financial, marketing and managerial efficiencies. Diseconomies of scale may arise from communication problems and loss of control as firms become too large.
内部规模经济包括技术、采购、财务、营销和管理效率。规模不经济可能源于企业过大导致的沟通问题和管理失控。
7. Market Structures | 市场结构
Perfect competition features many buyers and sellers, homogeneous products, perfect information and no barriers to entry. Firms are price takers and only earn normal profit in the long run.
完全竞争的特征是众多买卖方、同质产品、完全信息且无进入壁垒。企业是价格接受者，长期只能获得正常利润。
Monopoly exists when a single firm dominates the market with high barriers to entry. A monopolist is a price maker and can earn supernormal profits. Potential drawbacks include higher prices, less choice and reduced consumer surplus.
垄断指单一企业主导市场且进入壁垒高。垄断者是价格制定者，可获得超额利润。潜在弊端包括价格更高、选择更少和消费者剩余减少。
Oligopoly is a market with a few large firms, high barriers to entry and interdependence. Firms may engage in non-price competition and can collude formally (cartels) or informally to restrict output and raise prices.
寡头垄断是由少数大企业组成、进入壁垒高且相互依存的市场。企业可能进行非价格竞争，并可能正式（卡特尔）或非正式共谋以限制产出、抬高价格。
8. Macroeconomic Objectives and Indicators | 宏观经济目标与指标
Governments typically aim for stable economic growth (rising GDP without excessive inflation), low unemployment, stable prices (an inflation target, e.g. 2%), and a satisfactory balance of payments. Redistribution of income is also a common goal.
政府通常追求稳定的经济增长（GDP 上升且无过度通胀）、低失业、物价稳定（通胀目标，如 2%）及合意的国际收支。收入再分配也是常见目标。
Gross domestic product (GDP) measures the total value of output produced in a country. Real GDP per capita adjusts for inflation and population, providing a better indicator of living standards. Unemployment rates are calculated via the claimant count or labour force surveys.
国内生产总值（GDP）衡量一国生产的总产出价值。人均实际 GDP 经通胀和人口调整，能更好反映生活水平。失业率通过申请失业救济人数或劳动力调查计算。
Inflation, a sustained rise in the general price level, is measured by the consumer price index (CPI). Causes include demand-pull (excess aggregate demand) and cost-push (rising factor costs) inflation.
通货膨胀是物价总水平的持续上升，用消费者价格指数（CPI）衡量。成因包括需求拉动型（总需求过度）和成本推动型（要素成本上升）通胀。
9. Macroeconomic Policy | 宏观经济政策
Fiscal policy involves government spending and taxation. Expansionary policy (higher spending, lower taxes) boosts aggregate demand; contractionary policy does the opposite. Progressive taxes take a larger percentage from higher incomes, reducing inequality.
财政政策涉及政府支出与税收。扩张性政策（增加支出、减税）刺激总需求；紧缩性政策则相反。累进税从高收入中抽取更大比例，减少不平等。
Monetary policy uses interest rates and money supply to influence economic activity. A central bank lowers interest rates to encourage borrowing and investment, raising aggregate demand; it raises rates to cool an overheating economy. Quantitative easing is an unconventional tool used when rates are near zero.
货币政策运用利率和货币供给影响经济活动。中央银行降低利率以鼓励借贷和投资，提高总需求；提高利率以冷却过热经济。量化宽松是利率接近零时的非常规工具。
Supply-side policies aim to raise the productive potential of the economy by improving efficiency and productivity. Examples include investment in education, tax reforms, deregulation, and infrastructure projects. These can shift long-run aggregate supply (LRAS) to the right, enabling non-inflationary growth.
供给侧政策通过提高效率和生产率来提升经济的生产潜力。例子包括教育投资、税制改革、放松监管和基建工程。这些可使长期总供给（LRAS）右移，实现非通胀型增长。
10. International Trade | 国际贸易
Free trade occurs when countries exchange goods and services without protectionist barriers. The theory of comparative advantage states that countries should specialise in producing goods where they have a lower opportunity cost, then trade to gain mutual benefits.
自由贸易指国家间无保护主义壁垒地交换商品与服务。比较优势理论指出，各国应专业化生产机会成本较低的商品，然后通过贸易互获利益。
Protectionism involves measures to shield domestic industries from foreign competition. Tariffs are taxes on imports, raising their price and reducing demand. Quotas are physical limits on import volumes. Subsidies to domestic producers make them more competitive internationally.
保护主义包括保护国内产业免受外国竞争的措施。关税是对进口品征收的税，提高其价格并减少需求。配额是对进口量的实物限制。对国内生产者的补贴使其在国际上更具竞争力。
Trading blocs, such as the European Union, create free trade among members while maintaining common external barriers. The World Trade Organization (WTO) promotes trade liberalisation and settles disputes. Globalisation brings benefits like greater choice and efficiency but can also widen inequality and cause structural unemployment.
贸易集团如欧盟在成员间建立自由贸易，同时保持共同对外壁垒。世界贸易组织（WTO）促进贸易自由化并解决争端。全球化带来更多选择与效率等好处，但也可能加剧不平等并造成结构性失业。
11. Exchange Rates | 汇率
An exchange rate is the price of one currency in terms of another. In a floating system, it is determined by demand and supply in the foreign exchange market. A rise in the pound’s value is an appreciation; a fall is a depreciation.
汇率是一种货币以另一种货币表示的价格。在浮动汇率制下，由外汇市场的供需决定。英镑升值称为升值，贬值称为贬值。
A stronger pound makes exports more expensive and imports cheaper, potentially worsening the current account balance. A weaker pound does the opposite, boosting exports and making imports dearer. Governments may use a fixed exchange rate system, pegging their currency to another, requiring central bank intervention to maintain the peg.
强势英镑使出口更贵、进口更便宜，可能恶化经常账户平衡。弱势英镑则相反，促进出口并使进口更贵。政府可能采用固定汇率制，将本币钉住另一种货币，需要央行干预以维持钉住。
Interest rates strongly influence exchange rates. Higher rates attract ‘hot money’ inflows, increasing demand for the currency and causing appreciation. This relationship is a key part of the transmission mechanism of monetary policy.
利率强有力地影响汇率。更高利率吸引“热钱”流入，增加对该货币的需求并导致升值。这一关系是货币政策传导机制的关键部分。
12. Economic Development | 经济发展
Economic growth refers to an increase in real GDP, while economic development is a broader concept encompassing improvements in living standards, health, education, and political freedoms. Growth does not automatically guarantee development.
经济增长指实际 GDP 的增加，而经济发展是更广泛的概念，涵盖生活水平、健康、教育和政治自由的改善。增长并不自动保证发展。
The Human Development Index (HDI) combines income (GNI per capita), health (life expectancy), and education (mean and expected years of schooling) to rank countries. Limitations include its failure to capture inequality, environmental quality, or human rights.
人类发展指数（HDI）综合收入（人均国民总收入）、健康（预期寿命）和教育（平均与预期受教育年限）对国家排名。其局限包括未纳入不平等、环境质量或人权。
Barriers to development include poor infrastructure, high population growth, debt burdens, corruption, and reliance on volatile primary product exports. Official development assistance (aid) can help, but it must be well-targeted and free from political strings to be effective.
发展障碍包括基础设施差、人口增长快、债务负担、腐败以及依赖波动大的初级产品出口。官方发展援助（外援）可有所帮助，但必须精准使用且无政治附加条件才能有效。
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