📚 IGCSE Edexcel Economics: End-of-Term Revision Guide | IGCSE Edexcel 经济：期末复习提纲
As the term draws to a close, it is vital to consolidate your understanding of the IGCSE Edexcel Economics syllabus. This revision guide covers key micro and macro topics, essential definitions, diagrammatic analysis and exam tips. Use it to structure your final review and boost your confidence.
随着期末临近，巩固对 IGCSE Edexcel 经济学大纲的理解至关重要。本复习提纲涵盖了微观和宏观关键主题、基本定义、图表分析及考试技巧。用它来规划你的最终复习，提升信心。
1. Scarcity and Choice | 稀缺性与选择
The basic economic problem arises because resources are limited but human wants are infinite. This forces individuals, firms and governments to make choices, each incurring an opportunity cost – the next best alternative forgone.
基本经济问题源于资源有限而人类欲望无限。这迫使个人、企业和政府做出选择，每一次选择都会产生机会成本——即所放弃的次优替代品。
A production possibility curve (PPC) illustrates maximum output combinations of two goods, showing trade-offs. Points inside the curve indicate inefficiency or unemployment, while outward shifts represent economic growth.
生产可能性曲线（PPC）展示了两种商品的最大产出组合，体现权衡取舍。曲线内侧的点表示效率低下或失业，向外移动则代表经济增长。
Economic agents respond to incentives. For instance, a rise in wages may encourage workers to supply more labour, reflecting rational decision-making at the margin.
经济主体会对激励做出反应。例如，工资上涨可能激励劳动者提供更多劳动，这反映了边际上的理性决策。
2. Demand and Supply | 需求与供给
Demand represents the willingness and ability to purchase a good at a given price. The law of demand states that, ceteris paribus, as price falls, quantity demanded expands.
需求是指在给定价格下购买商品的意愿和能力。需求定律表明，在其他条件不变时，价格下降会导致需求量扩大。
Supply is the quantity firms are willing and able to sell. The law of supply states that higher prices typically lead to greater quantity supplied, due to profit incentive.
供给是企业愿意并能够销售的数量。供给定律指出，由于利润激励，价格上升通常带来更大的供给量。
Market equilibrium occurs where demand equals supply. Shifts in either curve – caused by changes in non-price factors such as income, tastes, costs of production or technology – lead to new equilibrium price and quantity.
市场均衡出现在需求等于供给之处。任一曲线因非价格因素（如收入、偏好、生产成本或技术）而移动，都会导致新的均衡价格和数量。
Common exam pitfalls: do not confuse a 'movement along' a curve (caused by own price change) with a 'shift' (caused by external determinants). Always label axes and curves clearly when drawing diagrams.
常见考试陷阱：切勿混淆由自身价格变化引起的“沿曲线移动”与由外部决定因素引起的“曲线移动”。画图时务必清晰标注坐标轴和曲线。
3. Price Elasticities | 价格弹性
Price elasticity of demand (PED) measures responsiveness of quantity demanded to a change in price.
需求价格弹性（PED）衡量需求量对价格变化的反应程度。
PED = %ΔQd ÷ %ΔP
lastic. Tax revenue implications depend on elasticity: an indirect tax on an inelastic good raises more revenue.
PED > 1 为弹性，PED < 1 为缺乏弹性，PED = 1 为单位弹性，PED = 0 完全无弹性，PED = ∞ 完全弹性。税收收入影响取决于弹性：对缺乏弹性商品征收间接税会带来更多收入。
Price elasticity of supply (PES) depends on time period and spare capacity. In the short run, supply tends to be more inelastic.
供给价格弹性（PES）取决于时间周期和闲置产能。短期内，供给往往更缺乏弹性。
Income elasticity of demand (YED): normal goods have positive YED, inferior goods negative. Cross elasticity of demand (XED): complements have negative XED, substitutes positive. These concepts help explain changes in market patterns.
需求收入弹性（YED）：正常品 YED 为正，低档品为负。需求交叉弹性（XED）：互补品 XED 为负，替代品为正。这些概念有助于解释市场模式的变化。
4. Market Failure and Government Intervention | 市场失灵与政府干预
Market failure occurs when the free market fails to allocate resources efficiently, leading to a net welfare loss. Key types include externalities, public goods, information asymmetries and monopoly power.
市场失灵发生在自由市场无法有效分配资源时，导致净福利损失。主要类型包括外部性、公共品、信息不对称和垄断势力。
Negative externalities, such as pollution from factories, cause overproduction because private costs ignore external costs. Positive externalities, like vaccination, lead to under-consumption. Governments can use taxation, subsidies, regulation or provision of information to correct these failures.
负外部性，如工厂污染，因私人成本忽视外部成本而造成过度生产。正外部性，如疫苗接种，导致消费不足。政府可通过税收、补贴、监管或提供信息来纠正这些失灵。
Public goods are non-excludable and non-rivalrous, e.g. street lighting. Private markets under-provide them, so government often steps in to supply them directly.
公共品具有非排他性和非竞争性，例如路灯。私人市场会供给不足，因此政府常常直接提供。
Merit and demerit goods: merit goods (healthcare, education) are under-consumed; demerit goods (cigarettes, alcohol) are over-consumed. Policies include nudges, advertising bans and minimum unit pricing.
优效品与劣效品：优效品（医疗、教育）消费不足；劣效品（香烟、酒精）消费过度。政策包括助推、广告禁令和最低单位定价。
5. Labour Markets | 劳动力市场
Wages are determined by the interaction of labour demand (derived from productivity and demand for final goods) and labour supply (influenced by population, education and non-monetary factors).
工资由劳动力需求（源自生产率和最终产品需求）和劳动力供给（受人口、教育及非货币因素影响）的相互作用决定。
Minimum wage laws set a legal floor on pay. If set above equilibrium, they can create excess supply (unemployment), especially for younger or less skilled workers. However, they may boost productivity and reduce poverty.
最低工资法规定了工资的法定下限。若设定高于均衡水平，可能造成超额供给（失业），尤其对年轻或低技能劳动者。但也可能提高生产率并减少贫困。
Trade unions can push wages upward by restricting labour supply or bargaining collectively. The impact depends on the elasticity of labour demand and the proportion of costs accounted for by wages.
工会通过限制劳动力供给或集体谈判推动工资上涨。影响取决于劳动力需求弹性以及工资在成本中所占比例。
Differences in earnings arise from varying skills, education, experience, discrimination and regional mobility barriers. Exam questions often ask for analysis of wage differentials with diagrams.
收入差异源于技能、教育、经验、歧视和区域流动障碍的不同。考试常要求结合图示分析工资差异。
6. Costs, Revenues and Objectives of Firms | 企业成本、收入与目标
(AC) = TC ÷ output. Marginal cost (MC) is the additional cost of producing one extra unit.
短期内，至少一种要素是固定的。总成本（TC）= 总固定成本（TFC）+ 总可变成本（TVC）。平均成本（AC）= TC ÷ 产量。边际成本（MC）是额外生产一单位产品的追加成本。
tity = demand curve. Marginal revenue (MR) is the change in TR from selling one more unit.
收入概念：总收益（TR）= 价格 × 数量。平均收入（AR）= TR ÷ 数量 = 需求曲线。边际收入（MR）是多销售一单位所带来的总收益变化。
y also pursue other objectives: sales maximisation, satisficing, or social welfare in the case of non-profits.
利润最大化发生在 MC = MR 之处（前提是 MC 正在上升）。企业也可能追求其他目标：销售收入最大化、满意化，或非营利组织的社会福利。
Economies and diseconomies of scale explain long-run average cost shape. Internal economies include technical, purchasing and managerial efficiencies, while external economies arise from industry-wide improvements.
规模经济与规模不经济解释了长期平均成本曲线的形状。内部经济包括技术、采购和管理效率，外部经济来自整个行业的改善。
7. Market Structures | 市场结构
Markets range from perfect competition to monopoly. Key features to compare are number of firms, product differentiation, barriers to entry, and long-run profit.
市场结构从完全竞争到垄断。比较的关键特征是厂商数量、产品差异化程度、进入壁垒和长期利润。
Perfect competition: many firms, homogeneous products, no barriers, price takers, normal profit in long run. Monopoly: single seller, high barriers, price maker, can earn supernormal profit even in the long run.
完全竞争：众多厂商，同质产品，无进入壁垒，价格接受者，长期获得正常利润。垄断：单一卖家，高壁垒，价格制定者，长期亦可获得超额利润。
Oligopoly involves a few interdependent firms, which may collude or compete non-price. A kinked demand curve model explains price rigidity. Monopolistic competition combines many sellers with differentiated products, leading to some price-setting power but zero long-run supernormal profit.
寡头垄断由少数相互依赖的厂商组成，可能合谋或进行非价格竞争。弯折需求曲线模型解释了价格刚性。垄断竞争结合了众多卖家和差异化产品，拥有一定定价权，但长期超额利润为零。
Competition policy aims to curb anti-competitive practices such as price fixing, predatory pricing and limiting supply. Regulators can impose fines or break up monopolies.
竞争政策旨在遏制反竞争行为，如价格操纵、掠夺性定价和限制供应。监管机构可处以罚款或分拆垄断企业。
8. Macroeconomic Objectives and Indicators | 宏观经济目标与指标
Governments typically pursue four main objectives: low and stable inflation, economic growth, low unemployment, and a sustainable balance of payments. Potential conflicts exist, e.g. growth vs. inflation.
政府通常追求四大目标：低且稳定的通货膨胀、经济增长、低失业率和可持续的国际收支。目标之间可能存在冲突，例如增长与通胀。
Inflation is a sustained rise in the general price level, measured by the Consumer Price Index (CPI). Demand-pull inflation stems from excess aggregate demand, while cost-push inflation arises from rising production costs. Deflation and disinflation are distinct concepts.
通货膨胀是总体价格水平的持续上升，通过消费者物价指数（CPI）衡量。需求拉动型通胀源于总需求过剩，成本推动型通胀则来自生产成本上升。通货紧缩与反通胀是不同的概念。
ctural, frictional and seasonal. The unemployment rate = (unemployed ÷ labour force) × 100%.
失业衡量愿意且有能力工作但找不到工作的人。类型包括周期性、结构性、摩擦性和季节性失业。失业率 =（失业人数 ÷ 劳动力）× 100%。
Economic growth is the increase in real GDP over time. Short-term growth results from using spare capacity, while long-term growth requires an increase in the quantity or quality of factors of production.
经济增长是一段时间内实际 GDP 的增长。短期增长源于利用闲置产能，长期增长则要求生产要素数量或质量的提高。
9. Fiscal and Monetary Policy | 财政与货币政策
Fiscal policy involves government spending and taxation. Expansionary fiscal policy (higher G, lower T) boosts aggregate demand and can reduce unemployment, but risks inflation and crowding out. Contractionary policy cools an overheating economy.
财政政策涉及政府支出和税收。扩张性财政政策（增加 G、降低 T）可提振总需求并降低失业，但有通胀和挤出风险。紧缩性政策则为过热经济降温。
Monetary policy uses interest rates and the money supply to influence AD. Central banks lower interest rates to encourage borrowing and spending; raise rates to curb inflation. Quantitative easing (QE) is an unconventional tool to inject liquidity.
货币政策利用利率和货币供给影响总需求。央行降低利率以鼓励借贷和支出；提高利率以抑制通胀。量化宽松（QE）是注入流动性的非常规工具。
Supply-side policies aim to shift long-run aggregate supply (LRAS) rightwards by improving productivity and efficiency. Examples include education reform, infrastructure investment, deregulation and tax incentives.
供给侧政策旨在通过提高生产率和效率，使长期总供给（LRAS）右移。例子包括教育改革、基础设施投资、放松管制和税收激励。
Policy evaluation: consider time lags, side effects, equity and the stage of the economic cycle. A mix of policies often works best.
政策评价：考虑时滞、副作用、公平性以及经济周期阶段。政策组合往往效果最佳。
10. International Trade and Protectionism | 国际贸易与保护主义
International trade arises from comparative advantage: a country should specialise in producing goods for which it has the lowest opportunity cost. Both trading partners can gain from exchange.
国际贸易源于比较优势：一国应专门生产其机会成本最低的商品。贸易双方均可从交换中获益。
Protectionism involves restricting imports via tariffs, quotas, subsidies or non-tariff barriers. Arguments for protection include protecting infant industries, preventing dumping and safeguarding strategic sectors.
保护主义通过关税、配额、补贴或非关税壁垒限制进口。支持保护的理由包括保护幼稚产业、防止倾销和维护战略部门。
Free trade generally increases consumer choice, lowers prices and raises global efficiency. However, it may cause structural unemployment in import-competing industries and worsen income inequality.
自由贸易通常增加消费者选择、降低价格并提高全球效率。但也可能造成进口竞争行业的结构性失业，加剧收入不平等。
Trading blocs (EU, USMCA) liberalise trade among members but may create trade diversion. The World Trade Organization (WTO) promotes global free trade and settles disputes.
贸易集团（欧盟、美墨加协定）在成员国间实现贸易自由化，但可能造成贸易转移。世界贸易组织（WTO）促进全球自由贸易并解决争端。
11. Exchange Rates and Balance of Payments | 汇率与国际收支
An exchange rate is the price of one currency in terms of another. It can be floating (market-determined), fixed (peg) or managed float. Appreciation strengthens a currency; depreciation weakens it.
汇率是一种货币以另一种货币表示的价格。可以是浮动（市场决定）、固定（钉住）或有管理的浮动。升值使货币走强；贬值使其走弱。
Exchange rate changes affect exports and imports. A depreciation makes exports cheaper and imports dearer, potentially improving the current account – provided the Marshall-Lerner condition holds.
汇率变化影响出口和进口。货币贬值使出口更便宜、进口更昂贵，若马歇尔-勒纳条件成立，可改善经常账户。
The balance of payments records transactions between residents and the rest of the world. The current account includes trade in goods, services, income and transfers. A deficit must be matched by a surplus in the financial/capital account.
国际收支记录居民与世界其他国家之间的交易。经常账户包括商品贸易、服务、收入和转移。赤字必须由金融/资本账户的顺差来弥补。
Policies to correct a current account deficit include expenditure-reducing (tight fiscal/monetary) and expenditure-switching (devaluation, protectionism) measures. Supply-side reforms can boost export competitiveness over time.
纠正经常账户赤字的政策包括减少支出（紧缩财政/货币）和转换支出（贬值、保护主义）措施。供给侧改革可逐步提升出口竞争力。
12. Economic Growth and Development | 经济增长与发展
Economic growth (increase in real GDP per capita) is not the same as economic development, which encompasses wider improvements in living standards, health, education and human freedoms.
经济增长（人均实际 GDP 增长）不同于经济发展，后者涵盖生活水平、健康、教育和人类自由等更广泛的改善。
The Human Development Index (HDI) combines life expectancy, education and GNI per capita. While useful, it omits inequality, environmental quality and political freedom.
人类发展指数（HDI）综合了预期寿命、教育和人均国民总收入。虽有用，但忽略了不平等、环境质量和政治自由。
Barriers to development include inadequate infrastructure, poor governance, high indebtedness and adverse geography. International aid, debt relief and trade reforms can help, but aid dependency may harm long-term incentives.
发展障碍包括基础设施不足、治理不善、高负债和不利地理条件。国际援助、债务减免和贸易改革可提供帮助，但援助依赖可能损害长期激励。
Sustainable development meets present needs without compromising future generations. It requires balancing economic, social and environmental goals – a theme increasingly examined in IGCSE contexts.
可持续发展在满足当前需求的同时不损害后代能力。它需要平衡经济、社会和环境目标——这一主题在 IGCSE 考试中日益多见。
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