📚 A-Level OCR Economics: End-of-Term Revision Outline | A-Level OCR 经济：期末复习提纲
As an A-Level OCR Economics student, an end-of-term revision outline serves as a vital tool to consolidate core microeconomic and macroeconomic concepts before examinations. This checklist walks you through the essential theories, models, and policy applications, enabling you to identify strengths and areas for improvement in a structured way.
作为 A-Level OCR 经济学的学生，期末复习提纲是在考试前巩固微观与宏观经济核心概念的重要工具。这份清单将带你梳理关键理论、模型和政策应用，帮助你以结构化的方式发现强项和薄弱环节。
1. Microeconomics Fundamentals | 微观经济学基础
The basic economic problem is scarcity: unlimited human wants but limited resources. This forces individuals, firms, and governments 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：无限的人类欲望与有限的资源。这迫使个人、企业和政府做出选择，每个选择都涉及机会成本——即放弃的次优替代品。
Production Possibility Frontiers (PPFs) illustrate maximum potential output of two goods, showing trade-offs, opportunity cost, and the concepts of productive efficiency (points on the curve) and allocative efficiency (where society’s preferences match output). Economic growth shifts the PPF outward.
生产可能性边界（PPF）展示了两种商品的最大潜在产出，体现了权衡、机会成本，以及生产效率（曲线上点的位置）和分配效率（社会偏好与产出匹配）的概念。经济增长会使PPF向外移动。
Economic statements are either positive (factual, testable) or normative (value‑based). Recognising the difference is essential for structured evaluation.
经济学陈述分为实证性（事实、可验证）和规范性（基于价值判断）。区分两者对于规范地进行评估至关重要。
2. Demand, Supply and Elasticity | 需求、供给与弹性
The law of demand states that, ceteris paribus, as the price of a good falls, quantity demanded increases. The law of supply indicates that as price rises, quantity supplied increases. Market equilibrium occurs where demand equals supply, and shifts in either curve alter the equilibrium price and quantity.
需求定律指出，其他条件不变，商品价格下降，需求量增加。供给定律表明，价格上升，供给量增加。市场均衡出现在需求等于供给之处，任一曲线的移动都会改变均衡价格和数量。
Price Elasticity of Demand (PED) = (%ΔQd) ÷ (%ΔP)
PED measures the responsiveness of quantity demanded to a price change. A value >1 is elastic; <1 is inelastic; =1 is unit elastic. Determinants include substitutes, necessity, proportion of income, and time.
PED 衡量需求量对价格变化的反应程度。大于1为富有弹性；小于1为缺乏弹性；等于1为单位弹性。决定因素包括替代品、必需品属性、占收入比例和时间。
Income elasticity of demand (YED) determines whether a good is normal (positive YED) or inferior (negative YED). Cross elasticity of demand (XED) identifies complements (negative) and substitutes (positive). Price elasticity of supply (PES) is influenced by production flexibility and time.
需求收入弹性（YED）用于判断正常品（YED为正）和劣等品（YED为负）。需求交叉弹性（XED）识别互补品（负值）和替代品（正值）。供给价格弹性（PES）受生产灵活性和时间影响的制约。
3. Market Structures | 市场结构
Perfect competition features many small firms, homogeneous products, free entry and exit, and perfect information. In the long run, firms earn only normal profit, producing at the lowest point on the average cost curve, achieving both productive and allocative efficiency.
完全竞争市场有许多小企业、同质产品、自由进出和完全信息。长期中，企业只获得正常利润，在平均成本曲线最低点生产，同时实现生产效率和分配效率。
Monopoly exists when a single firm dominates the market with high barriers to entry. A profit‑maximising monopolist sets MC=MR, resulting in higher price and lower output than perfect competition, leading to inefficiency and potential welfare loss. Price discrimination can extract consumer surplus.
垄断是指单一企业凭借高进入壁垒主导市场。利润最大的垄断者在MC=MR点定价，导致价格高于和产出低于完全竞争，带来无效率和福利损失。价格歧视可能榨取消费者剩余。
Monopolistic competition combines many firms with product differentiation. Short‑run supernormal profits attract entry, driving demand down until only normal profit remains in the long run. Oligopoly is characterised by a few interdependent firms, strategic behaviour, and models like kinked demand curve and game theory.
垄断竞争结合了许多企业和产品差异化。短期超额利润吸引进入，压低需求直到长期仅剩正常利润。寡头垄断的特征是少数相互依存的企业、策略性行为，以及弯折需求曲线和博弈论等模型。
Contestable markets have low sunk costs and the threat of hit‑and‑run entry, forcing even monopolists to behave competitively, limiting price rises and encouraging efficiency.
可竞争市场具有低沉没成本以及“打了就跑”式进入威胁，迫使甚至垄断者也采取竞争行为，抑制价格上涨并促进效率。
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. Externalities are third‑party spillover effects not reflected in prices. Negative production externalities (e.g., pollution) lead to overproduction; positive consumption externalities (e.g., education) lead to under‑consumption.
市场失灵是指自由市场未能有效配置资源。外部性是未在价格中反映的第三方溢出效应。负生产外部性（如污染）导致过度生产；正消费外部性（如教育）导致消费不足。
Public goods are non‑rival and non‑excludable, leading to the free‑rider problem and under‑provision in a free market. Information gaps cause misallocation, as seen in merit and demerit goods.
公共物品具有非竞争性和非排他性，导致搭便车问题和自由市场供给不足。信息鸿沟导致配置失当，比如公益品和有害品。
Government intervention includes indirect taxation, subsidies, price controls, regulation, and provision of information. However, government failure can arise from unintended consequences, high administration costs, and regulatory capture.
政府干预手段包括间接税、补贴、价格管制、监管和信息提供。但政府失灵可能源于意外后果、高昂行政成本和规制俘获。
5. Labour Market | 劳动力市场
Wages are determined by the demand for labour (derived from marginal revenue product) and the supply of labour (affected by working conditions, qualifications, and geographic mobility). Imperfections such as monopsony power allow employers to pay below competitive wages.
工资由劳动力需求（源于边际收益产品）和劳动力供给（受工作条件、资质和地域流动性影响）决定。买方垄断等不完全性使雇主可以支付低于竞争水平的工资。
Minimum wage policies aim to raise living standards but can cause unemployment if set above equilibrium, especially in low‑skilled markets. Trade unions and collective bargaining may also push wages above equilibrium, impacting employment levels.
最低工资政策旨在提高生活水平，但若设定高于均衡水平，尤其在低技能市场，可能导致失业。工会和集体谈判也可能将工资推高至均衡之上，影响就业数量。
Discrimination and inequality persist despite anti‑discrimination legislation. The Gini coefficient measures income inequality, and policies such as progressive taxation and investment in human capital can reduce disparities.
尽管有反歧视法律，歧视和不平等仍存在。基尼系数衡量收入不平等，累进税制和人力资本投资等政策可以减少差距。
6. Macroeconomic Indicators and Objectives | 宏观经济指标与目标
Governments target steady economic growth, low and stable inflation, low unemployment, and a satisfactory balance of payments. GDP measures the value of output, while real GDP controls for inflation. Inflation is tracked by the Consumer Price Index (CPI).
政府致力于实现稳定的经济增长、低而平稳的通胀、低失业和令人满意的国际收支。GDP 衡量产出价值，而实际 GDP 剔除了通胀影响。通胀通过消费者物价指数（CPI）来跟踪。
Unemployment comes in various types: cyclical (demand‑deficient), structural, frictional, and seasonal. The claimant count and Labour Force Survey provide measurement. Balance of payments consists of the current, capital, and financial accounts.
失业分为多种类型：周期性（需求不足型）、结构性、摩擦性和季节性失业。申领人数和劳动力调查是衡量方式。国际收支由经常账户、资本账户和金融账户组成。
Conflicts between objectives, such as the short‑run trade‑off between low unemployment and low inflation (Phillips curve), require careful policy evaluation.
各目标之间存在冲突，例如低失业与低通胀之间的短期取舍（菲利普斯曲线），需要审慎的政策评估。
7. Aggregate Demand and Aggregate Supply | 总需求与总供给
Aggregate Demand (AD) is the total spending on U.K. goods and services: AD = C + I + G + (X − M). Changes in components shift the AD curve. The multiplier effect magnifies initial changes in spending.
Multiplier k = 1 ÷ (1 − MPC) or k = 1 ÷ (MPS + MPT + MPM)
总需求（AD）是对英国商品和服务的总支出：AD = C + I + G + (X – M)。各组成部分的变化会使 AD 曲线移动。乘数效应会放大初始支出的变动。
Short‑run Aggregate Supply (SRAS) shows production at given input prices; shifts occur due to changes in costs of production. Long‑run Aggregate Supply (LRAS) depends on the quantity and quality of factors of production. Classical economists view LRAS as vertical at the full‑employment level, while Keynesians allow for an elastic region during deep recession.
短期总供给（SRAS）反映给定投入价格下的产量；生产成本变化会使曲线移动。长期总供给（LRAS）取决于生产要素的数量和质量。古典经济学家视LRAS为在充分就业水平上的垂直线，而凯恩斯学派则认为深度衰退时存在一段弹性区域。
Equilibrium national output occurs where AD=SRAS, and output gaps – either negative (recessionary) or positive (inflationary) – guide policy responses.
国民产出均衡发生在AD=SRAS处，产出缺口——无论是负的（衰退性）还是正的（通货膨胀性）——都对政策应对有指导意义。
8. Macroeconomic Policy | 宏观经济政策
Fiscal policy involves government spending and taxation. Expansionary fiscal policy (higher G, lower T) boosts AD but may widen the budget deficit. Crowding out can dampen the effect if government borrowing raises interest rates.
财政政策涉及政府支出和税收。扩张性财政政策（增加G，削减T）刺激总需求，但可能扩大预算赤字。如果政府借贷推高利率，挤出效应可能削弱政策效果。
Monetary policy, managed by the Bank of England, uses changes to the base interest rate and quantitative easing to influence AD and meet the 2% CPI inflation target. The transmission mechanism affects borrowing, saving, and the exchange rate.
货币政策由英格兰银行管理，通过调整基准利率和量化宽松影响总需求，以实现2%的CPI通胀目标。传导机制作用于借贷、储蓄和汇率。
Supply‑side policies aim to increase productive potential by improving labour market flexibility, competition, education, and infrastructure. Such policies can shift LRAS rightwards without fuelling inflation.
供给侧政策旨在通过提升劳动力市场弹性、竞争、教育和基础设施来扩大生产潜力，从而在不助长通胀的情况下将LRAS向右移动。
9. International Trade and Globalisation | 国际贸易与全球化
The theory of comparative advantage shows that trade can benefit all partners if countries specialise in goods with lower opportunity cost. However, terms of trade, protectionism, and transportation costs can reduce these gains.
比较优势理论表明，如果各国专门生产机会成本较低的商品，贸易可以使所有参与方受益。但贸易条件、保护主义和运输成本可能减少此收益。
Protectionist tools include tariffs, quotas, subsidies, and non‑tariff barriers. While they safeguard domestic jobs and infant industries, they typically raise consumer prices and invite retaliation.
保护主义工具包括关税、配额、补贴和非关税壁垒。虽然它们能够保护国内就业和幼稚产业，但通常会抬高消费品价格并招致报复。
Exchange rates are determined in floating systems by supply and demand, or managed through central bank intervention. Appreciation makes exports dearer and imports cheaper, affecting the current account. The Marshall‑Lerner condition explains when a depreciation improves the trade balance.
浮动汇率制中汇率由供求决定，或通过央行干预管理。升值使出口变贵，进口变便宜，影响经常账户。马歇尔‑勒纳条件阐明了贬值何时能改善贸易收支。
10. Economic Development and Financial Markets | 经济发展与金融市场
Development is a broader concept than economic growth, incorporating health, education, and human freedoms. The Human Development Index (HDI) combines life expectancy, education, and GNI per capita. Developing countries face barriers such as poor infrastructure, debt, and corruption.
经济发展比经济增长内涵更广，涵盖健康、教育和人的自由。人类发展指数（HDI）综合了预期寿命、教育和人均GNI。发展中国家面临基础设施薄弱、债务和腐败等障碍。
Market‑based strategies (trade liberalisation, FDI) and interventionist approaches (aid, buffer stock schemes) aim to foster development, but success varies with governance and global conditions. Sustainable development balances growth with environmental protection.
基于市场的战略（贸易自由化、FDI）和干预主义方法（援助、缓冲库存计划）旨在促进发展，但成效因治理和全球环境而异。可持续发展要在增长与环境保护之间取得平衡。
Financial markets channel savings to investment, provide liquidity, and allow risk management through derivatives. Central banks act as lenders of last resort, and the global financial crisis highlighted the dangers of excessive risk‑taking and regulatory failure.
金融市场将储蓄引导至投资，提供流动性，并通过衍生品管理风险。央行担任最后贷款人，全球金融危机凸显了过度冒险行为和监管失灵的危害。
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