📚 IGCSE Economics: Final Revision Guide | IGCSE 经济：期末复习提纲
This comprehensive revision guide covers the essential topics for the IGCSE Economics examination. Master these key concepts, definitions, and analytical tools to build confidence and perform well. Each section is structured to help you quickly review the core syllabus areas.
这份全面的复习提纲涵盖了IGCSE经济学考试的核心主题。掌握这些关键概念、定义和分析工具，有助于你建立信心并取得好成绩。每个部分都旨在帮助你快速回顾核心课程内容。
1. The Basic Economic Problem | 基本经济问题
Scarcity is the fundamental economic problem: unlimited wants but limited resources. This forces individuals, firms, and governments to make choices, each involving an opportunity cost – the next best alternative forgone.
稀缺性是基本的经济问题：无限的欲望与有限的资源之间的矛盾。这迫使个人、企业和政府做出选择，每一个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), labour (human effort), capital (man-made aids to production), and enterprise (the risk-taking ability to organise the other three factors). Goods can be classified as free goods (unlimited supply, no opportunity cost) or economic goods (scarce, with opportunity cost).
四种生产要素是土地（自然资源）、劳动力（人力）、资本（人造的生产工具）和企业家才能（承担风险以组织其他三要素的能力）。商品可分为免费物品（供给无限，无机会成本）和经济物品（稀缺，有机会成本）。
2. Production Possibility Curve (PPC) | 生产可能性曲线
The PPC shows the maximum possible output combinations of two goods an economy can produce with existing resources and technology. Points on the curve are efficient, inside are inefficient, and outside are unattainable.
生产可能性曲线（PPC）展示了一个经济体在现有资源和技术条件下，能够生产的两种商品最大可能的产出组合。曲线上的点是有效率的，曲线内的点是无效率的，曲线外的点则无法达到。
A shift outward of the PPC represents economic growth, caused by an increase in the quantity or quality of resources, or technological progress. The curve is typically concave to the origin due to the law of increasing opportunity cost, but can be a straight line if resources are perfectly adaptable.
PPC向外移动代表经济增长，由资源数量或质量的提高，或技术进步引起。由于机会成本递增规律，曲线通常凹向原点，但如果资源完全可适应，也可能是一条直线。
3. Demand and Supply | 需求与供给
Demand is the quantity of a good consumers are willing and able to buy at a given price over a period of time. The law of demand states that as price rises, quantity demanded falls (inverse relationship). A change in price causes a movement along the curve; shifts are caused by non-price factors (income, tastes, prices of substitutes/complements, population, etc.).
需求是指消费者在一段时间内，在给定价格下愿意且能够购买的商品数量。需求定律表明，价格上涨，需求量下降（反向关系）。价格变化导致沿曲线移动；非价格因素（收入、偏好、替代品/互补品价格、人口等）导致曲线位移。
Supply is the quantity producers are willing and able to sell at a given price. The law of supply states that as price rises, quantity supplied rises (direct relationship). Shifts in supply are caused by changes in costs of production, technology, taxes/subsidies, weather, number of sellers, etc.
供给是指生产者愿意并能够在给定价格下出售的数量。供给定律表明，价格上涨，供给量增加（正向关系）。供给曲线的位移由生产成本、技术、税收/补贴、天气、卖家数量等变化引起。
4. Price Elasticity | 弹性
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price. PED = % change in quantity demanded / % change in price. Demand is elastic if PED > 1, inelastic if PED < 1, unit elastic if PED = 1.
需求价格弹性（PED）衡量需求量对价格变化的反应程度。PED = 需求量变化百分比 / 价格变化百分比。若PED > 1，需求有弹性；PED < 1，需求缺乏弹性；PED = 1，单位弹性。
Determinants of PED include availability of substitutes, proportion of income spent, necessity vs luxury, and time period. PED affects total revenue: if demand is elastic, a price rise lowers total revenue; if inelastic, a price rise raises total revenue.
PED的决定因素包括替代品的可得性、支出占收入的比例、必需品还是奢侈品，以及时间范围。PED影响总收益：若需求有弹性，涨价减少总收益；若缺乏弹性，涨价增加总收益。
Price elasticity of supply (PES) measures the responsiveness of quantity supplied to a price change. Key determinants are time period, spare capacity, and ease of storage.
供给价格弹性（PES）衡量供给量对价格变化的反应程度。关键决定因素包括时间周期、剩余产能和储存的难易程度。
5. Market Equilibrium and the Price Mechanism | 市场均衡与价格机制
Equilibrium occurs where quantity demanded equals quantity supplied, with no tendency for change. Excess demand (shortage) pushes price up; excess supply (surplus) pushes price down. The price mechanism allocates resources through the signalling, incentive, and rationing functions of prices.
均衡出现在需求量等于供给量时，没有变化的趋势。超额需求（短缺）推动价格上升；超额供给（过剩）推动价格下降。价格机制通过价格的信号功能、激励功能和配给功能来配置资源。
6. 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. Causes include externalities (positive or negative spillover effects), public goods (non-excludable and non-rival), merit and demerit goods, monopoly power, and information asymmetry.
市场失灵是指自由市场未能有效配置资源。原因包括外部性（正或负的溢出效应）、公共物品（非排他性和非竞争性）、优值品和劣值品、垄断力量以及信息不对称。
Governments intervene through taxation (e.g., on demerit goods), subsidies (e.g., on merit goods), regulation (e.g., pollution permits), price controls (maximum/minimum prices), and direct provision of public goods. Intervention may lead to government failure if costs outweigh benefits.
政府通过税收（如对劣值品征税）、补贴（如对优值品补贴）、监管（如污染许可证）、价格控制（最高/最低价格）以及直接提供公共物品来进行干预。如果干预的成本大于收益，可能导致政府失灵。
7. Costs of Production and Business Objectives | 生产成本与企业目标
In the short run, at least one factor is fixed; in the long run, all factors are variable. Total cost (TC) = total fixed cost (TFC) + total variable cost (TVC). Average cost (AC) = TC/output. Marginal cost (MC) is the cost of producing one extra unit. The law of diminishing returns explains why MC rises after a certain point.
在短期，至少有一种生产要素固定；在长期，所有要素都可变。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量的成本。边际收益递减规律解释了为何边际成本在超过某点后上升。
Firms may aim to maximise profits, but also pursue objectives such as sales maximisation, growth, satisficing, or social responsibility. Profit = total revenue (TR) – total cost (TC). Profit maximisation occurs where marginal cost (MC) = marginal revenue (MR).
企业可能以利润最大化为目标，但也追求如销售额最大化、增长、满意化或社会责任等目标。利润 = 总收益（TR）– 总成本（TC）。利润最大化发生在边际成本（MC）= 边际收益（MR）处。
8. Market Structure | 市场结构
Market structures range from perfect competition to monopoly. Perfect competition features many buyers and sellers, homogenous products, no barriers to entry/exit, and perfect information. Firms are price-takers and only earn normal profit in the long run.
市场结构从完全竞争到垄断。完全竞争的特征是许多买卖双方、同质产品、无进入或退出壁垒以及完全信息。企业是价格接受者，长期只能获得正常利润。
Monopoly is a single seller with high barriers to entry, allowing supernormal profits. Oligopoly has a few large firms, interdependence, and likely non-price competition. Monopolistic competition has many firms, product differentiation, and some price-setting power.
垄断是单一卖家有高进入壁垒，可获得超额利润。寡头垄断有几个大企业，相互依赖，可能存在非价格竞争。垄断竞争有许多企业，产品差异化，有一定的定价能力。
9. Macroeconomic Objectives | 宏观经济目标
Governments typically aim for sustainable economic growth (increase in real GDP), low and stable inflation (general rise in price level), low unemployment, and a satisfactory balance of payments. Conflicts can arise, e.g., growth vs inflation, or growth vs environmental protection.
政府通常致力于可持续的经济增长（实际GDP增长）、低而稳定的通货膨胀（总体物价水平的上涨）、低失业率和良好的国际收支。目标之间可能存在冲突，如增长与通胀，或增长与环境保护。
The business cycle shows fluctuations in economic activity: boom, downturn, recession, recovery. Key indicators include GDP, inflation rate (CPI), unemployment rate, and current account balance.
商业周期显示经济活动的波动：繁荣、下行、衰退、复苏。关键指标包括GDP、通胀率（CPI）、失业率和经常账户余额。
10. Fiscal and Monetary Policy | 财政与货币政策
Fiscal policy involves government spending and taxation to influence aggregate demand (AD). Expansionary fiscal policy (lower taxes, higher spending) boosts AD; contractionary does the opposite. Government budget balance = tax revenue – spending.
财政政策涉及政府支出和税收，以影响总需求（AD）。扩张性财政政策（减税、增加支出）刺激总需求；紧缩性财政政策则相反。政府预算平衡 = 税收收入 – 支出。
Monetary policy uses interest rates and money supply, usually managed by a central bank. Lower interest rates encourage borrowing and spending, increasing AD; higher rates reduce AD. Supply-side policies aim to increase productive capacity, e.g., education, training, deregulation.
货币政策利用利率和货币供应量，通常由中央银行管理。降低利率鼓励借贷和支出，增加总需求；提高利率抑制总需求。供给侧政策旨在提高生产能力，如教育、培训、放松管制。
11. International Trade and Exchange Rates | 国际贸易与汇率
Countries trade due to comparative advantage, where a country can produce a good at a lower opportunity cost than another. Specialisation and trade increase total output. Trade barriers include tariffs, quotas, and subsidies, often used to protect domestic industries but causing inefficiency.
国家之间因比较优势而进行贸易，即一个国家能以比另一个国家更低的机会成本生产某种商品。专业化和贸易能增加总产出。贸易壁垒包括关税、配额和补贴，常用于保护国内产业，但会导致效率损失。
Exchange rate is the price of one currency in terms of another. A depreciation makes exports cheaper and imports dearer, potentially improving the trade balance. An appreciation has the opposite effect. Exchange rates can be determined by floating (market forces) or fixed systems.
汇率是一种货币以另一种货币表示的价格。货币贬值使出口更便宜，进口更昂贵，可能改善贸易收支。升值则相反。汇率可由浮动（市场力量）或固定体系决定。
12. Globalisation and Development | 全球化与发展
Globalisation refers to the increasing interdependence of countries through trade, investment, migration, and technology. Benefits include greater consumer choice, lower costs, and economic growth; drawbacks include job losses and inequality.
全球化是指通过贸易、投资、移民和技术，各国之间相互依存度不断提高。好处包括消费者选择增多、成本降低和经济增长；弊端包括失业和不平等。
Development considers living standards, measured by Human Development Index (HDI), not just GDP. Developing countries face challenges such as poverty, lack of infrastructure, and debt. Policies to promote development include aid, fair trade, debt relief, and investment in education.
发展关乎生活水平，由人类发展指数（HDI）衡量，而不仅仅是GDP。发展中国家面临贫困、基础设施缺乏和债务等挑战。促进发展的政策包括援助、公平贸易、债务减免和教育投资。
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