📚 IGCSE OCR Economics: Last-Minute Revision Notes | IGCSE OCR 经济：考前冲刺笔记
This revision guide distils the entire IGCSE OCR Economics syllabus into a focused set of notes, perfect for last-minute preparation. Every key concept, diagram interpretation point and common exam pitfall is mapped to OCR assessment objectives so you can revise efficiently.
这份复习指南将 IGCSE OCR 经济科目所有重点浓缩为考前冲刺笔记，紧扣 OCR 评分要求，帮助你高效回顾核心概念、图表分析和常见错误。
1. The Economic Problem & Factors of Production | 经济问题与生产要素
Scarcity is the fundamental economic problem: finite resources cannot satisfy infinite human wants. This forces every economy to answer three questions – What to produce? How to produce? For whom to produce?
稀缺性是基本经济问题：有限的资源无法满足无限的人类需求。这使得每个经济体都必须回答三个问题 —— 生产什么？如何生产？为谁生产？
Opportunity cost is the value of the next best alternative sacrificed when a choice is made. It exists because of scarcity and always applies to consumers, firms and governments.
机会成本是当做出选择时所放弃的次优选择的价值。它因稀缺性而存在，并始终适用于消费者、企业和政府。
The four factors of production are land (natural resources), labour (human effort), capital (man-made aids for production) and enterprise (the risk-taking ability to combine the other factors). Rewards are rent, wages, interest and profit respectively.
四种生产要素是土地（自然资源）、劳动（人力付出）、资本（人造生产工具）和企业（承担风险、组合其他要素的能力）。它们分别获得的报酬为地租、工资、利息和利润。
2. Demand, Supply & Market Equilibrium | 需求、供给与市场均衡
The law of demand states there is an inverse relationship between price and quantity demanded, ceteris paribus. A change in price causes a movement along the demand curve; changes in factors like income, tastes, the price of substitutes/complements or population shifts the entire curve.
需求法则指出，在其他条件不变的情况下，价格与需求量成反比。价格变动导致沿需求曲线的移动；收入、偏好、替代品/互补品价格或人口等因素变动则使整条曲线平移。
The law of supply shows a direct relationship between price and quantity supplied. Shifts in supply are caused by changes in production costs, technology, indirect taxes/subsidies, weather or the number of sellers.
供给法则表明价格与供给量成正比。生产成本、技术、间接税/补贴、天气或卖家数量的变化会引起供给曲线平移。
Market equilibrium occurs where demand equals supply. Excess demand pushes price up; excess supply forces price down. In a free market, price acts as a signal and incentive to remove shortages or surpluses.
市场均衡出现在需求量等于供给量时。超额需求推高价格，超额供给压低价格。在自由市场中，价格充当信号和激励，消除短缺或过剩。
3. Price Elasticity of Demand & Supply | 需求与供给的价格弹性
PED = %ΔQd / %ΔP
需求价格弹性 = 需求量变化百分比 ÷ 价格变化百分比
Elastic demand (PED > 1) means consumers are very responsive to price changes. Inelastic demand (PED < 1) means they are less responsive. A perfectly inelastic curve is vertical; perfectly elastic is horizontal.
弹性需求（PED > 1）意味着消费者对价格变化很敏感。非弹性需求（PED < 1）则不太敏感。完全无弹性曲线是垂直的，完全弹性曲线是水平的。
For inelastic demand, a price rise increases total revenue; for elastic demand, a price rise reduces total revenue. This helps firms set pricing strategies.
若需求缺乏弹性，提价会增加总收益；若需求富有弹性，提价会减少总收益。这有助于企业制定定价策略。
Price elasticity of supply (PES) measures how responsive quantity supplied is to a price change. Key influences are production time, spare capacity, availability of stock and ease of entry into the market.
供给价格弹性（PES）衡量供给量对价格变化的反应程度。主要影响因素包括生产时长、闲置产能、库存可得性和市场进入难易度。
4. Production, Costs & Revenue | 生产、成本与收益
In the short run at least one factor is fixed; in the long run all factors are variable. The law of diminishing marginal returns explains why marginal product eventually falls when adding extra workers to a fixed capital base.
短期中至少有一种要素固定，长期中所有要素均可变。边际收益递减规律解释了在固定资本基础上增加工人时，边际产量最终会下降。
Total cost = fixed cost + variable cost. Average total cost is total cost ÷ output. The lowest point of the average cost curve shows productive efficiency.
总成本 = 固定成本 + 可变成本。平均总成本 = 总成本 ÷ 产量。平均成本曲线的最低点代表生产效率。
Total revenue = price × quantity. Average revenue equals the demand curve. Profit is maximised where marginal revenue equals marginal cost (MR = MC).
总收益 = 价格 × 数量。平均收益等于需求曲线。当边际收益等于边际成本（MR = MC）时利润最大。
Economies of scale reduce long-run average costs as output rises (e.g. bulk-buying, technical, financial). Diseconomies of scale occur when the firm becomes too large and problems like poor communication raise average costs.
规模经济随着产量增加降低长期平均成本（如批量采购、技术、财务优势）。规模不经济则指企业过于庞大导致沟通不畅等问题而使平均成本上升。
5. Market Structures | 市场结构
Perfect competition features many buyers and sellers, identical products, no barriers to entry and perfect information. Firms are price takers; profits are competed away in the long run.
完全竞争的特征是买卖双方众多、产品同质、无进入壁垒和信息完全。企业是价格接受者，长期中利润会被竞争消除。
Monopoly is a single seller with high barriers to entry. It is a price maker and can earn supernormal profits even in the long run. Monopolies may under-produce and charge higher prices, leading to a welfare loss.
垄断指只有一个卖家且进入壁垒很高。它是价格制定者，即使在长期也能获得超额利润。垄断可能生产不足并收取高价，造成福利损失。
Oligopoly is dominated by a few interdependent firms. Price rigidity and non-price competition (e.g. advertising) are common. Collusion can lead to cartel behaviour, which raises prices and restricts output.
寡头市场由少数相互依存的企业主导。价格刚性和非价格竞争（如广告）很常见。合谋行为可形成卡特尔，抬高价格并限制产量。
6. Market Failure & Government Intervention | 市场失灵与政府干预
Market failure occurs when the free market fails to allocate resources efficiently. Main causes: negative and positive externalities, public goods (non-rival and non-excludable), information gaps and market power.
市场失灵是指自由市场未能有效配置资源。主要原因包括：负外部性和正外部性、公共品（非竞争性和非排他性）、信息不对称以及市场势力。
Negative externalities (e.g. pollution) mean social cost > private cost, causing over-production. A diagram shows the marginal social cost curve lying above the supply curve. To correct this, governments impose indirect taxes equal to the external cost.
负外部性（如污染）意味着社会成本 > 私人成本，导致过度生产。图形中边际社会成本曲线位于供给曲线之上。政府可通过征收等于外部成本的间接税来纠正。
Positive externalities (e.g. vaccination) mean social benefit > private benefit, causing under-consumption. Subsidies equal to the external benefit shift the demand curve rightwards and increase output to the socially optimal level.
正外部性（如疫苗接种）意味着社会收益 > 私人收益，导致消费不足。给予等于外部收益的补贴可使需求曲线右移，使产量达到社会最优水平。
Public goods would not be provided by the market because of the free-rider problem. Governments step in to provide defence, street lighting and flood control through taxation.
公共品因搭便车问题无法由市场提供。政府通过税收介入，提供国防、路灯和防洪等公共品。
7. Macroeconomic Objectives | 宏观经济目标
Governments typically target steady economic growth, low and stable inflation, low unemployment, a balanced current account and an equitable distribution of income. Conflicts exist, e.g. between growth and price stability.
政府通常追求稳定的经济增长、低且稳定的通货膨胀、低失业率、经常账户平衡以及收入公平分配。目标之间可能存在冲突，例如增长与物价稳定之间的矛盾。
GDP measures the total value of output produced within a country in a given period. Real GDP strips out inflation to show genuine growth. GDP per capita gives a rough measure of living standards but ignores inequality and non-market activities.
GDP 衡量一国在一定时期内生产的总产出价值。实际 GDP 剔除通胀影响以显示真实增长。人均 GDP 大致衡量生活水平，但忽视了不平等和非市场活动。
The Human Development Index (HDI) combines life expectancy, education and GNI per capita to provide a broader view of development, helping to overcome some limitations of GDP alone.
人类发展指数（HDI）结合预期寿命、教育和人均国民总收入来更全面地衡量发展水平，弥补了仅用 GDP 的不足。
8. Fiscal & Monetary Policy | 财政与货币政策
Fiscal policy uses government spending and taxation to influence aggregate demand. Expansionary fiscal policy (higher spending, lower taxes) can boost growth and reduce unemployment but risks higher inflation and a larger budget deficit.
财政政策通过政府支出和税收影响总需求。扩张性财政政策（增加支出、减税）可刺激增长并降低失业，但可能带来高通胀和更大的预算赤字。
Monetary policy involves controlling interest rates and the money supply, usually by a central bank. Lower interest rates encourage borrowing and consumption, shifting aggregate demand to the right. Higher rates cool an overheating economy.
货币政策涉及控制利率和货币供应量，通常由中央银行执行。降低利率鼓励借贷和消费，使总需求右移。提高利率则为过热经济降温。
Supply-side policies focus on increasing the productive capacity of the economy: investment in education, infrastructure, privatisation and reducing red tape. These policies can shift the long-run aggregate supply curve outwards without raising inflation.
供给侧政策旨在提高经济生产能力：投资教育、基础设施、私有化以及减少繁文缛节。这些政策可在不推高通胀的情况下使长期总供给曲线向外移动。
9. International Trade & Exchange Rates | 国际贸易与汇率
Countries trade because of comparative advantage: the ability to produce a good at a lower opportunity cost than another country. Specialisation and trade allow global output to rise.
国家进行贸易是因为比较优势：以比另一国更低的机会成本生产某种商品的能力。专业化和贸易使全球总产出增加。
Protectionist measures include tariffs, quotas, subsidies to domestic producers and embargoes. They shield domestic industries but risk retaliation and higher prices for consumers.
贸易保护措施包括关税、配额、对国内生产者的补贴和禁运。它们保护了本国产业，但可能招致报复并使消费者支付更高价格。
Exchange rates affect trade. A depreciation makes exports cheaper and imports dearer, improving the trade balance if demand is elastic. Appreciation has the opposite effect. Central banks may intervene by buying or selling currency.
汇率影响贸易。贬值使出口变便宜、进口变贵，若需求弹性充足可改善贸易差额。升值则效果相反。中央银行可通过买卖货币干预汇市。
10. Economic Growth & Development | 经济增长与发展
Economic growth is measured by an increase in real GDP. It can be driven by rising aggregate demand (land, labour, capital productivity) or by supply-side improvements like technological progress.
经济增长用实际 GDP 增长来衡量。可由总需求上升（土地、劳动、资本生产率提升）或技术进步等供给侧改善驱动。
Development is a wider concept covering health, education, political freedom and sustainability. Policies for development include aid, debt relief, investment in education and fair trade schemes.
发展是一个更广泛的概念，涵盖健康、教育、政治自由和可持续性。促进发展的政策包括援助、债务减免、教育投资和公平贸易计划。
Benefits of growth include higher living standards and greater tax revenues. Costs include environmental damage, inequality and depletion of non-renewable resources. Sustainable growth aims to balance current and future needs.
增长的好处包括更高的生活水平和更多税收。代价包括环境破坏、不平等加剧和不可再生资源耗竭。可持续增长力求平衡当代与未来的需求。
11. Inflation & Unemployment | 通货膨胀与失业
Inflation is a sustained rise in the general price level, commonly measured by the Consumer Price Index (CPI). Demand-pull inflation occurs when total demand exceeds supply; cost-push inflation results from rising production costs (e.g. oil price shocks).
通货膨胀是物价总水平持续上涨，常用消费者价格指数（CPI）衡量。需求拉动型通胀是总需求超过供给所致；成本推动型通胀源于生产成本上升（如油价冲击）。
Unemployment types include cyclical (due to low aggregate demand), structural (skills mismatch), frictional (between jobs) and seasonal. The labour force survey defines the unemployed as those actively seeking work.
失业类型包括周期性（总需求不足）、结构性（技能错配）、摩擦性（换工作期间）和季节性失业。劳动力调查将积极寻找工作者定义为失业人口。
There is often a short-run trade-off between inflation and unemployment (shown by the Phillips curve). However, supply‑side policies can help reduce both in the long run by shifting the long‑run Phillips curve.
短期内通胀与失业之间通常存在权衡取舍（菲利普斯曲线所示）。但供给侧政策可通过移动长期菲利普斯曲线在长期同时降低二者。
12. Exam Tips & Common Mistakes | 考试技巧与常见错误
Always give precise definitions when a command word states ‘Define’ or ‘State’. For example, ‘opportunity cost’ must include ‘the next best alternative forgone’, not just ‘what you give up’.
当指令词为“Define”或“State”时，务必给出精确的定义。例如“机会成本”必须包含“放弃的次优选择”，而不仅仅是“你放弃的东西”。
When drawing diagrams, label axes fully (e.g. ‘Price (£)’, ‘Quantity of apples per week’). Show shifts with arrows and clearly mark the new equilibrium. An accurate, labelled diagram can earn multiple marks even without lengthy explanation.
画图时应完整标注坐标轴（如“价格（£）”、“苹果的周需求量”），用箭头展示曲线平移并清楚标出新的均衡点。一幅准确标注的图表即使没有冗长解释也能拿到不少分数。
In discuss/evaluate questions, build a balanced argument. Identify two sides, support each with analysis, and finish with a justified conclusion that refers back to the context, e.g. ‘The extent of the impact depends on the PED of the good in question…’.
在讨论/评价题中，要构建平衡的论证。识别正反两面，分别结合分析支撑，最后以结合情景的合理结论收尾，如“影响程度取决于相关商品的 PED……”。
Common mistake: confusing movements along a curve with shifts. Memorise: price changes cause movements along the curve; other determinants shift the entire curve. Apply the same logic to both demand and supply.
常见错误：混淆沿曲线移动与曲线平移。记住：价格变化导致沿曲线移动，其他决定因素则使整条曲线平移。这一逻辑对需求与供给均适用。
Manage your time by allocating marks per minute. For a 6-mark question, spend about 8 minutes. Leave time to check definitions, units and graph labels. If you run out of time, bullet-point the final evaluation points to secure marks.
按分值分配时间，一道6分题大约用8分钟。留出时间检查定义、单位和图表标注。如果时间不足，可用要点符号列出最后的评价性观点，以确保拿到分数。
Published by TutorHao | Economics Revision Series | aleveler.com
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