📚 Mind Map Quick Revision for IGCSE Edexcel Economics | IGCSE Edexcel 经济：思维导图速记
This mind-map-style revision guide distills the entire IGCSE Edexcel Economics syllabus into a clear, interconnected set of core ideas. Start from the central theme — 'the economic problem' — and branch out through micro and macro layers, linking definitions, diagrams, and real-world applications. Use this visual-textual map to lock in key concepts fast.
这份思维导图式复习指南将 IGCSE Edexcel 经济学的完整考纲提炼为一组清晰、相互关联的核心思想。从中心主题——'经济问题'出发，发散到微观与宏观层面，将定义、图像与实际应用紧密串联。用这张图文导图快速锁定关键概念。
1. The Central Economic Problem | 核心经济问题
Resources are finite but human wants are unlimited, giving rise to scarcity. This forces every economy to answer three fundamental questions: What to produce? How to produce? For whom to produce?
资源是有限的，但人类的欲望是无限的，这就产生了稀缺性。这迫使每个经济体回答三个基本问题：生产什么？如何生产？为谁生产？
Scarcity leads to choice, and every choice involves an opportunity cost — the next best alternative forgone. A PPC (Production Possibility Curve) illustrates scarcity, choice, and opportunity cost. Points on the curve are efficient; inside the curve are inefficient; outside are unattainable with current resources.
稀缺导致选择，每一个选择都涉及机会成本——所放弃的次优选项。生产可能性曲线（PPC）展示了稀缺、选择和机会成本。曲线上的点是有效率的；曲线内的点无效率；曲线外的点在当前资源下无法达到。
Economic agents: Households, firms, and the government make decisions to allocate resources. The economic problem is at the heart of both microeconomics and macroeconomics.
经济主体：家庭、企业和政府做出资源配置的决策。经济问题是微观经济学与宏观经济学的核心。
2. Demand and Supply | 需求与供给
The demand curve slopes downward: as price falls, quantity demanded rises (law of demand). The downward slope is explained by the income effect and substitution effect. The supply curve slopes upward: as price rises, quantity supplied increases (law of supply), because higher prices increase profitability.
需求曲线向下倾斜：价格下降，需求量上升（需求定律）。向下倾斜的原因可以由收入效应和替代效应解释。供给曲线向上倾斜：价格上升，供给量增加（供给定律），因为更高的价格能提高盈利。
A movement along the curve is caused by a change in the good's own price. A shift of the entire curve is caused by changes in conditions of demand (e.g., income, tastes, prices of related goods, population) or conditions of supply (e.g., costs of production, technology, taxes, subsidies, weather).
沿曲线的移动是由商品自身价格的变化引起的。整条曲线的平移是由需求条件（如收入、偏好、相关商品价格、人口）或供给条件（如生产成本、技术、税收、补贴、天气）的变化引起的。
Market equilibrium occurs where demand equals supply. If price is above equilibrium, there is excess supply (surplus); if below, excess demand (shortage). Prices act as signals and incentives, guiding resources to where they are most valued.
市场均衡出现在需求等于供给的位置。价格高于均衡时，存在超额供给（过剩）；低于均衡时，存在超额需求（短缺）。价格发挥了信号和激励的作用，引导资源流向价值最高的地方。
3. Price Elasticity | 弹性
nd (PED) measures responsiveness of quantity demanded to a change in price. Formula: PED = %ΔQd / %ΔP. Values: |PED| > 1 elastic (luxuries, many substitutes); |PED| < 1 inelastic (necessities, addictive goods); |PED| = 1 unit elastic.
需求价格弹性（PED）衡量需求量对价格变化的反应程度。公式：PED = 需求量变动% / 价格变动%。数值：|PED| > 1 富有弹性（奢侈品、替代品多）；|PED| < 1 缺乏弹性（必需品、成瘾品）；|PED| = 1 单位弹性。
PED affects total revenue: if demand is elastic, a price cut raises total revenue; if inelastic, a price rise raises total revenue. Price elasticity of supply (PES) depends on time period and spare capacity. Income elasticity of demand (YED): normal goods have positive YED; inferior goods have negative YED. Luxury goods YED > 1; necessities YED between 0 and 1.
PED影响总收入：如果需求富有弹性，降价会增加总收入；如果缺乏弹性，提价会增加总收入。供给价格弹性（PES）取决于时间周期和闲置产能。需求收入弹性（YED）：正常品YED为正；劣等品YED为负。奢侈品YED > 1；必需品YED在0到1之间。
Cross elasticity of demand (XED): substitutes have positive XED; complements have negative XED. The magnitude indicates the strength of the relationship.
需求交叉弹性（XED）：替代品XED为正；互补品XED为负。数值的大小表明了关系的强弱。
4. Market Failure | 市场失灵
Market failure occurs when the free market fails to allocate resources efficiently, leading to a net social welfare loss. Main types: externalities, public goods, information gaps, and market power.
市场失灵发生在自由市场无法有效配置资源，导致社会净福利损失的情况下。主要类型：外部性、公共品、信息缺口和市场势力。
Negative externalities (e.g., pollution) cause overproduction because private cost < social cost. Positive externalities (e.g., education) cause underproduction because private benefit < social benefit. Public goods are non-excludable and non-rival, leading to the free-rider problem. Merit goods (e.g., healthcare) are under-consumed; demerit goods (e.g., cigarettes) are over-consumed.
负外部性（如污染）导致生产过剩，因为私人成本 < 社会成本。正外部性（如教育）导致生产不足，因为私人收益 < 社会收益。公共品具有非排他性和非竞争性，导致搭便车问题。有益品（如医疗）消费不足；有害品（如香烟）消费过度。
Government intervention can correct market failure: indirect taxes (to internalise negative externalities), subsidies (for positive externalities), regulation, tradable pollution permits, state provision, and information campaigns.
政府干预可以纠正市场失灵：间接税（将负外部性内部化）、补贴（针对正外部性）、管制、可交易的污染许可证、国家提供以及信息宣传活动。
5. Government Intervention and Government Failure | 政府干预与政府失灵
Governments use multiple tools: maximum price (price ceiling) to protect consumers — if set below equilibrium, it creates a shortage; minimum price (price floor) to protect producers — leads to surplus. Indirect taxes shift supply left, raising price; subsidies shift supply right, lowering price.
政府使用多种工具：最高限价（价格天花板）保护消费者——若设在均衡价之下就会造成短缺；最低限价（价格地板）保护生产者——导致过剩。间接税使供给曲线左移，提高价格；补贴使供给曲线右移，降低价格。
Government failure arises when intervention distorts the market more than the original failure, e.g., unintended consequences, excessive administrative costs, or information failures. It's important to evaluate the effectiveness of policies by considering their impact on efficiency, equity, and economic welfare.
政府失灵出现在干预对市场的扭曲超过原有失灵时，例如意外后果、过高的行政成本或信息不足。评估政策有效性时，必须从效率、公平和经济福利的角度加以考量。
6. Macroeconomic Objectives | 宏观经济目标
Governments typically pursue four main macroeconomic objectives: economic growth, low and stable inflation, low unemployment, and a satisfactory balance of payments on the current account. Some governments also target income distribution and environmental sustainability.
政府通常追求四个主要的宏观经济目标：经济增长、低且稳定的通货膨胀、低失业率，以及令人满意的经常账户收支平衡。一些政府还将收入分配和环境可持续性列为目标。
mployed / labour force) x 100. The current account records trade in goods, services, primary income, and secondary income.
经济增长通过实际GDP的百分比变化来衡量。通货膨胀由消费者价格指数（CPI）衡量。失业率 = （失业人数 / 劳动力人数）× 100。经常账户记录货物、服务、初次收入和二次收入。
The business cycle shows fluctuations in economic activity over time: boom, downturn, recession, recovery. Actual output can deviate from potential (trend) output, giving rise to a positive or negative output gap.
经济周期显示经济活动随时间的波动：繁荣、下行、衰退、复苏。实际产出可能偏离潜在（趋势）产出，形成正或负的产出缺口。
7. Aggregate Demand and Aggregate Supply | 总需求与总供给
. Consumption (C) is the largest component and depends on disposable income, wealth, interest rates, and consumer confidence. Investment (I) depends on interest rates, business confidence, and expected future demand.
总需求（AD）= C + I + G + (X - M)。消费（C）是最大组成部分，取决于可支配收入、财富、利率和消费者信心。投资（I）取决于利率、企业信心和预期未来需求。
The AD curve slopes downward due to the wealth effect, interest rate effect, and international trade effect. Shifts in AD are caused by changes in any of its components.
AD曲线向下倾斜的原因有财富效应、利率效应和国际贸易效应。AD的移动由任何一个组成部分的变化引起。
Short-run aggregate supply (SRAS) slopes upward because higher output prices raise profit margins while some input costs are fixed. Long-run aggregate supply (LRAS) is vertical at the full-employment level of output, determined by the quantity and quality of factors of production.
短期总供给（SRAS）向上倾斜，因为在某些投入成本固定的情况下，较高的产出价格会提高利润率。长期总供给（LRAS）在充分就业产出水平上是一条垂直线，由生产要素的数量和质量决定。
8. Inflation, Unemployment, and the Phillips Curve | 通货膨胀、失业与菲利普斯曲线
Inflation is a sustained increase in the general price level. Cost-push inflation results from rising costs of production (e.g., wages, raw materials). Demand-pull inflation occurs when AD grows faster than the economy's capacity to produce.
通货膨胀是指一般价格水平的持续上升。成本推动型通胀源于生产成本（如工资、原材料）的上升。需求拉动型通胀发生在AD增长速度超过经济生产能力时。
Unemployment types: cyclical (demand-deficient), structural (mismatch of skills), frictional (between jobs), and seasonal. The natural rate of unemployment includes structural and frictional unemployment. Full employment does not mean zero unemployment.
失业类型：周期性（需求不足型）、结构性（技能错配）、摩擦性（换工作期间）和季节性。自然失业率包含结构性和摩擦性失业。充分就业并不意味着零失业。
The short-run Phillips curve suggests an inverse relationship between inflation and unemployment, but in the long run, this trade-off breaks down and the curve becomes vertical at the natural rate of unemployment.
短期菲利普斯曲线显示通货膨胀与失业之间存在反向关系，但在长期，这种权衡消失，曲线在自然失业率处变为垂直线。
9. Economic Growth and Living Standards | 经济增长与生活水平
Economic growth is an increase in the productive potential of an economy, shown by an outward shift of the PPC or LRAS. It can be achieved through higher investment, technological progress, improved education and training, and better infrastructure.
经济增长是经济体生产潜力的增加，表现为PPC或LRAS向外移动。这可以通过增加投资、技术进步、改善教育和培训以及更好的基础设施来实现。
Benefits of growth include higher real incomes, more jobs, and improved government finances (more tax revenue). Costs include environmental damage, resource depletion, and widening inequality if benefits are unevenly distributed.
增长的好处包括更高的实际收入、更多就业和改善的政府财政（更多税收）。代价包括环境损害、资源枯竭以及如果利益分配不均则会加剧的不平等。
Real GDP per capita is a standard measure of living standards, but it has limitations: it ignores income distribution, non-market activities, pollution, and leisure. Alternative measures like the Human Development Index (HDI) combine income, health, and education indicators.
人均实际GDP是衡量生活水平的标准，但存在局限：它忽略了收入分配、非市场活动、污染和休闲。人类发展指数（HDI）等替代指标综合了收入、健康和教育等因素。
10. Fiscal, Monetary, and Supply-Side Policies | 财政、货币与供给侧政策
Fiscal policy involves government spending and taxation. Expansionary fiscal policy (higher spending or lower taxes) boosts AD; contractionary fiscal policy reduces AD. A government budget can be balanced, in surplus, or in deficit.
财政政策涉及政府支出和税收。扩张性财政政策（增加支出或减税）刺激AD；紧缩性财政政策抑制AD。政府预算可以是平衡、盈余或赤字。
Monetary policy uses interest rates and the money supply, typically managed by a central bank. Lower interest rates encourage borrowing and spending, increasing AD. Higher interest rates have the opposite effect. Quantitative easing (QE) is an unconventional tool used when interest rates are near zero.
货币政策运用利率和货币供给，通常由中央银行管理。降低利率鼓励借贷和支出，增加AD。提高利率则有相反效果。量化宽松（QE）是利率接近零时使用的非常规工具。
Supply-side policies aim to increase productive capacity and shift LRAS rightwards. Examples: investment in education, tax incentives for R&D, labour market reforms, deregulation, and infrastructure spending.
供给侧政策旨在提高生产能力，使LRAS右移。例如：教育投资、研发税收优惠、劳动力市场改革、放松管制和基础设施支出。
11. International Trade and Protectionism | 国际贸易与保护主义
International trade allows countries to specialise according to comparative advantage and benefit from economies of scale. The balance of payments records all transactions between a country and the rest of the world. The current account deficit means a country is spending more abroad than it earns.
国际贸易使各国能根据比较优势进行专业化生产，并从规模经济中获益。国际收支平衡表记录了一个国家与世界其他国家之间的所有交易。经常账户赤字意味着一个国家的海外支出超过其收入。
Protectionism involves barriers to trade: tariffs (tax on imports), quotas (quantity limits), subsidies to domestic producers, and non-tariff barriers (e.g., regulations). Arguments for protectionism: protecting infant industries, preventing dumping, safeguarding jobs. Arguments against: higher prices for consumers, inefficiency, retaliation, and reduced global welfare.
保护主义包括贸易壁垒：关税（进口税）、配额（数量限制）、对国内生产者的补贴以及非关税壁垒（如法规）。支持保护主义的理由：保护幼稚产业、防止倾销、保障就业。反对理由：消费者面临更高价格、效率降低、招致报复和全球福利减少。
12. Exchange Rates and Globalisation | 汇率与全球化
An exchange rate is the price of one currency in terms of another. It can be determined in a floating system (by supply and demand), a fixed system (pegged by the central bank), or a managed float. Appreciation makes exports dearer and imports cheaper; depreciation does the opposite.
汇率是一种货币以另一种货币表示的价格。它可以在浮动汇率制度（由供需决定）、固定汇率制度（由央行钉住）、或有管理的浮动汇率制度中确定。升值使出口变贵、进口变便宜；贬值则相反。
Globalisation refers to the increasing integration and interdependence of world economies through trade, capital flows, migration, and technology transfer. Multinational corporations (MNCs) bring investment and jobs but may also exploit labour and avoid tax.
全球化指的是通过贸易、资本流动、移民和技术转让，世界经济日益一体化和相互依存。跨国公司（MNC）带来投资和就业，但也可能剥削劳动力并避税。
Changes in the exchange rate affect the current account. The Marshall-Lerner condition states that a depreciation will improve a trade deficit if the sum of PED for exports and imports is greater than 1. In the J-curve effect, the trade balance worsens in the short run before improving.
汇率变化会影响经常账户。马歇尔-勒纳条件指出，如果出口和进口的PED之和大于1，本币贬值将改善贸易逆差。在J曲线效应中，贸易收支在好转之前会先短期恶化。
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