📚 IB CCEA Economics: Mind Map Quick Revision | IB CCEA 经济：思维导图速记
This mind-map guide breaks down the entire IB CCEA Economics syllabus into ten interconnected branches, each capturing the essential definitions, diagrams, and policy links you need for quick revision. Rather than memorising isolated facts, you will see how scarcity leads to choice, how markets can fail, why governments intervene, and how the whole economy fits together in the AD/AS framework. Every section pairs a concise English explanation with a matching Chinese version so you can internalise key terms and causal chains in both languages.
这张思维导图速记把 IB CCEA 经济学全部考纲拆解为十个紧密相连的分支，每一条分支都提炼了核心定义、图形要点和政策联系，帮助你快速回顾。与死记硬背孤立知识点不同，你将看到稀缺如何导向选择，市场为什么会失灵，政府为何需要干预，以及整个经济体如何通过 AD/AS 模型联动。每一节都用精炼的英文和对应的中文解释配对，让你在双语切换中真正内化关键术语和因果链条。
1. The Central Economic Problem | 核心经济问题
At the heart of economics lies the problem of scarcity — unlimited wants confronting finite resources. This forces every society to answer three fundamental questions: What to produce? How to produce? For whom to produce? The production possibility curve (PPC) is the go-to diagram here, showing trade-offs, opportunity cost, and the potential for economic growth when the curve shifts outward.
经济学的核心是稀缺性问题——无限的欲望面对有限的资源。这让每个社会都必须回答三个基本问题：生产什么？如何生产？为谁生产？生产可能性曲线（PPC）是这里的关键图形，它展示了权衡取舍、机会成本，以及曲线向外移动时的经济增长潜力。
Opportunity cost is defined as the next best alternative forgone. On a PPC, moving from one point to another means sacrificing some units of one good to get more of the other. Its slope reflects the marginal rate of transformation. When resources are unemployed or used inefficiently, the economy operates inside the PPC. Long-run growth comes from increased factor quantity or quality, shifting the entire curve to the right.
机会成本被定义为放弃的次优选择。在 PPC 上，从一点移到另一点意味着牺牲一定数量的某种商品以获得更多另一种商品。曲线的斜率反映了边际转换率。当资源闲置或利用无效率时，经济就在 PPC 内部运行。长期增长源于要素数量增加或质量提升，推动整条曲线向右移动。
2. Demand, Supply & Market Equilibrium | 需求、供给与市场均衡
The law of demand states that, ceteris paribus, as price falls quantity demanded rises. The law of supply says that as price rises quantity supplied rises. The interaction determines the market-clearing price and quantity where demand equals supply. A movement along the curve is caused by a change in the good’s own price, whereas a shift of the whole curve occurs when a non-price determinant changes, such as income, tastes, related goods’ prices, number of buyers, or expectations on the demand side, and input costs, technology, taxes, subsidies, or number of sellers on the supply side.
需求定律指出，在其他条件不变的情况下，价格下降则需求量上升。供给定律指出，价格上升则供给量上升。两者的相互作用决定了市场出清价格和数量，即需求等于供给的点。沿着曲线的移动是由商品自身价格变化引起的；而整条曲线的平移则源于非价格决定因素变化，如需求侧的收入、偏好、相关商品价格、买者数量和预期，以及供给侧的投入成本、技术、税收、补贴和卖者数量。
Excess demand (shortage) pushes price up; excess supply (surplus) pushes price down. The price mechanism thus performs a rationing, signalling, and incentive function. In real-world markets, governments sometimes impose price ceilings (maximum prices, e.g., rent controls) that lead to persistent shortages, or price floors (minimum prices, e.g., minimum wage, agricultural support) that generate surpluses.
超额需求（短缺）推动价格上升；超额供给（过剩）推动价格下降。价格机制因此执行配给、信号和激励三大功能。在现实市场中，政府有时会实施价格上限（最高限价，如租金管制）从而导致持续短缺，或价格下限（最低限价，如最低工资、农业支持）导致过剩。
3. Elasticity: Measuring Responsiveness | 弹性：衡量反应程度
Price elasticity of demand (PED) measures how much quantity demanded responds to a change in price. Its formula is
需求的价格弹性（PED）衡量需求量对价格变化的反应程度。其公式为
PED = %ΔQd ÷ %ΔP
If |PED| > 1, demand is price elastic — total revenue moves inversely with price. If |PED| < 1, demand is inelastic — total revenue moves in the same direction as price. Determinants include the availability of substitutes, degree of necessity, proportion of income spent, and time horizon. Perfectly elastic demand is a horizontal line; perfectly inelastic demand is vertical.
如果 |PED| > 1，需求富有价格弹性——总收益与价格反向变动。如果 |PED| < 1，需求缺乏弹性——总收益与价格同向变动。决定因素包括替代品的可获得性、必需品程度、支出占收入比重以及时间跨度。完全弹性的需求是一条水平线；完全无弹性的需求是垂直线。
Income elasticity of demand (YED) shows the responsiveness of demand to a change in income. Normal goods have positive YED; luxury goods have YED > 1; inferior goods have negative YED. Cross-price elasticity of demand (XED) measures the responsiveness of demand for one good to a change in the price of another. Complements have negative XED, substitutes have positive XED.
需求的收入弹性（YED）显示需求对收入变化的反应程度。正常商品的 YED 为正；奢侈品的 YED > 1；低档商品的 YED 为负。需求的交叉价格弹性（XED）衡量一种商品的需求对另一种商品价格变化的反应程度。互补品的 XED 为负，替代品的 XED 为正。
Price elasticity of supply (PES) is %ΔQs ÷ %ΔP. Its main determinants are the length of the production period, spare capacity, ease of storing inventory, and the mobility of factors. In the short run, supply is often inelastic; in the long run it becomes more elastic as firms can adjust all inputs.
供给的价格弹性（PES）是 %ΔQs ÷ %ΔP。其主要决定因素包括生产周期长度、闲置产能、存货储存难易程度以及要素的流动性。短期内供给通常缺乏弹性；长期内随着企业能够调整所有投入，供给变得更加富有弹性。
4. Market Failure: When the Price Mechanism Falters | 市场失灵：当价格机制失灵时
Market failure occurs when the free market, left to itself, fails to allocate resources efficiently. The main types are externalities, public goods, information asymmetry, and market power. Externalities exist when a third party is affected by the production or consumption of a good and no compensation is paid. Negative externalities cause overproduction (MSC > MPC), while positive externalities cause underproduction (MSB > MPB).
市场失灵是指自由市场在无人干预的情况下无法有效配置资源。主要类型包括外部性、公共物品、信息不对称和市场势力。当第三方受到商品生产或消费的影响而未获得补偿时，就产生了外部性。负外部性导致过度生产（边际社会成本大于边际私人成本），正外部性导致生产不足（边际社会收益大于边际私人收益）。
Public goods are non-rivalrous and non-excludable, leading to the free-rider problem; therefore they would not be provided by the market and require government provision. Common access resources are rivalrous but non-excludable, giving rise to the tragedy of the commons through overuse. Governments correct market failures through indirect taxes (Pigouvian taxes), subsidies, regulation, tradable permits, and direct provision.
公共物品具有非竞争性和非排他性，导致搭便车问题；因此它们无法由市场提供，需要政府供给。公共资源具有竞争性但非排他性，因过度使用而引发公地悲剧。政府通过间接税（庇古税）、补贴、管制、可交易许可证和直接提供等方式纠正市场失灵。
Information asymmetry — where buyers and sellers do not have equal knowledge — leads to adverse selection (e.g., in insurance markets) and moral hazard (where one party takes excessive risks because another bears the cost). Monopoly power also generates market failure through higher prices, lower output, and deadweight loss compared to perfect competition.
信息不对称——买卖双方信息不对等——导致逆向选择（如保险市场）和道德风险（一方因另一方承担成本而过度冒险）。垄断势力也引发市场失灵，与完全竞争相比，它使价格更高、产量更低，并产生无谓损失。
5. Government Intervention & Its Limits | 政府干预及其局限性
Governments intervene not only to correct market failures but also to pursue equity. Instruments include taxes, subsidies, price controls, regulation, state provision, and redistribution through transfer payments. Indirect taxes can be specific (a fixed amount per unit) or ad valorem (a percentage of the price). A tax shifts the supply curve vertically upward by the tax amount, raising price for consumers, reducing price received by producers, and contracting quantity. The tax incidence depends on relative elasticities.
政府干预不仅为了纠正市场失灵，还为了追求公平。政策工具包括税收、补贴、价格控制、管制、国家供给和通过转移支付进行再分配。间接税可以是定额税（每单位固定金额）或从价税（价格的百分比）。税收使供给曲线向上垂直移动税收金额，提高消费者支付的价格，降低生产者获得的价格，并减少交易量。税负归宿取决于相对弹性。
Subsidies shift the supply curve downward, lowering consumer price and raising producer revenue. They can encourage merit goods (e.g., education, vaccines). However, government intervention is not flawless: it may lead to government failure caused by imperfect information, unintended consequences, administrative costs, and political pressures. For example, agricultural price floors can create wasteful surpluses; rent controls can reduce the supply and quality of housing.
补贴使供给曲线向下移动，降低消费者价格、增加生产者收入。它可以鼓励优值品（如教育、疫苗）。然而，政府干预也并非完美：它可能导致政府失灵，原因包括信息不完善、意外后果、行政成本和政治压力。例如，农产品价格下限可能造成浪费性的过剩；租金控制可能减少住房供给、降低住房质量。
6. Macroeconomic Objectives & Indicators | 宏观经济目标与指标
The four main macroeconomic objectives are low and stable inflation, low unemployment, sustained economic growth, and a satisfactory balance of payments. Key indicators include the GDP growth rate, the inflation rate (measured by CPI), the unemployment rate, and the current account balance. Real GDP strips out inflation to show actual output growth, while real GDP per capita gives a rough measure of living standards.
四大宏观经济目标是：低且稳定的通胀、低失业率、持续经济增长以及令人满意的国际收支。关键指标包括 GDP 增长率、通货膨胀率（由 CPI 衡量）、失业率和经常账户余额。实际 GDP 剔除了通胀影响以显示真实产出增长，而人均实际 GDP 则大致衡量生活水平。
Inflation can be demand-pull (too much spending chasing too few goods) or cost-push (rising costs of production, such as wages or raw materials). Deflation (persistently falling price level) can be even more dangerous, as it leads consumers to delay purchases and increases the real debt burden. Unemployment is categorised into cyclical, structural, frictional, and seasonal types. The natural rate of unemployment is the rate that exists when the economy is at full employment, comprising structural and frictional unemployment only.
通胀可以是需求拉动型（过多支出追逐过少商品）或成本推动型（工资或原材料等生产成本上升）。通缩（价格水平持续下降）可能更为危险，因为它使消费者推迟购买，并增加实际债务负担。失业分为周期性、结构性、摩擦性和季节性失业。自然失业率是经济处于充分就业状态时的失业率，仅包含结构性和摩擦性失业。
7. Aggregate Demand & Its Components | 总需求及其构成
Aggregate demand (AD) is the total spending on domestic goods and services at different price levels. AD = C + I + G + (X – M). Consumer spending (C) is the largest component and depends on factors like disposable income, wealth, interest rates, and consumer confidence. Investment (I) is spending by firms on capital goods and is influenced by interest rates, business confidence, technological change, and corporate taxes. Government spending (G) covers public services and infrastructure. Net exports (X – M) are determined by foreign income, exchange rates, and domestic competitiveness.
总需求（AD）是在不同价格水平下对国内商品和服务的总支出。AD = C + I + G + (X – M)。消费者支出（C）是最大组成部分，取决于可支配收入、财富、利率和消费者信心等因素。投资（I）是企业对资本品的支出，受利率、商业信心、技术变革和企业税影响。政府支出（G）涵盖公共服务和基础设施。净出口（X – M）取决于国外收入、汇率和国内竞争力。
Movements along the AD curve are caused by a change in the general price level (the wealth effect, interest rate effect, and trade effect). Shifts of the entire AD curve arise from changes in any component of spending that is not directly due to the price level, such as expansionary fiscal policy, monetary easing, or a boom in foreign markets.
沿着 AD 曲线的移动是由一般物价水平变动引起的（财富效应、利率效应和贸易效应）。整条 AD 曲线的平移源于支出组成部分中不直接由价格水平引起的变化，例如扩张性财政政策、货币宽松或国外市场繁荣。
8. Aggregate Supply: SRAS & LRAS | 总供给：短期与长期
Short-run aggregate supply (SRAS) shows the relationship between the price level and the quantity of real output firms are willing to produce, holding input prices constant. Its upward slope can be explained by sticky wages, menu costs, or misperceptions. SRAS shifts when production costs change — such as wages, raw material prices, energy costs, or indirect taxes and subsidies.
短期总供给（SRAS）显示在投入价格不变的情况下，价格水平与企业愿意生产的实际产出量之间的关系。其向上倾斜的原因可以用工资黏性、菜单成本或错觉来解释。当生产成本变化时——如工资、原材料价格、能源成本或间接税与补贴——SRAS 曲线会发生平移。
There are two main views of long-run aggregate supply (LRAS). The Keynesian view has an LRAS curve with a horizontal section (where the economy is in deep recession), an upward-sloping section (as bottlenecks appear), and a vertical section at full capacity. The monetarist/neo-classical view sees LRAS as perfectly inelastic (vertical) at the full employment level of output, because in the long run all prices and wages are flexible and the economy self-adjusts. Supply-side policies aim to shift LRAS to the right by improving the quantity and quality of factors of production.
关于长期总供给（LRAS）有两种主要观点。凯恩斯主义观点认为 LRAS 曲线有一段水平部分（经济处于深度衰退）、一段向上倾斜部分（随着瓶颈出现）以及一段达到充分产能的垂直部分。货币主义/新古典观点则认为 LRAS 在充分就业产出水平上完全无弹性（垂直），因为在长期内所有价格和工资都具有弹性，经济可自我调节。供给侧政策旨在通过改善生产要素的数量和质量将 LRAS 推向右侧。
9. Fiscal & Monetary Policy | 财政与货币政策
Fiscal policy involves the government altering its spending and taxation to influence aggregate demand. Expansionary fiscal policy (higher G, lower taxes) shifts AD to the right, useful for closing a recessionary gap. Contractionary fiscal policy does the opposite to cool an overheating economy. Automatic stabilisers, such as progressive taxes and unemployment benefits, work without deliberate policy changes, dampening economic fluctuations. The budget balance is the difference between government revenue and expenditure; a deficit adds to the national debt.
财政政策是指政府改变支出和税收以影响总需求。扩张性财政政策（增加 G、降低税收）使 AD 右移，有助于弥合衰退缺口。紧缩性财政政策则相反，用于给过热的经济降温。自动稳定器，如累进税和失业救济金，无需刻意政策调整即能发挥缓冲经济波动的作用。预算余额是政府收入与支出之差；赤字会叠加到国家债务上。
Monetary policy is typically carried out by an independent central bank, which manipulates interest rates and the money supply to achieve price stability and, secondarily, support growth. A lower interest rate reduces the cost of borrowing and the reward for saving, encouraging consumption and investment, shifting AD right. Quantitative easing (QE) is an unconventional tool where the central bank purchases financial assets to inject liquidity directly into the economy when interest rates are near zero.
货币政策通常由独立的中央银行执行，通过调控利率和货币供给以实现价格稳定，其次支持增长。较低的利率降低了借贷成本和储蓄回报，刺激消费和投资，使 AD 右移。量化宽松（QE）是一种非常规工具，当利率接近于零时，央行通过购买金融资产直接向经济注入流动性。
Policy conflicts can arise: expansionary measures to reduce unemployment may fuel inflation; tight monetary policy to control inflation may slow growth and raise unemployment. Supply-side policies can ease these trade-offs by expanding the economy’s productive potential without raising the price level.
政策之间可能出现冲突：为降低失业而采取的扩张措施可能推高通胀；为控制通胀的紧缩货币政策可能减缓增长并提高失业。供给侧政策可以在不提高价格水平的情况下扩大经济生产潜力，从而缓解这些权衡。
10. 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 both nations to consume beyond their PPCs. Protectionist measures include tariffs, quotas, subsidies to domestic producers, and non-tariff barriers. These worsen resource allocation and raise consumer prices but are often justified by infant industry, anti-dumping, or strategic arguments.
国家因比较优势而进行贸易——以低于另一国的机会成本生产某种商品的能力。专业化和贸易使两国都能在 PPC 之外消费。保护主义措施包括关税、配额、对国内生产者的补贴以及非关税壁垒。这些措施恶化资源配置、抬高消费者价格，但常以幼稚产业、反倾销或战略理由辩护。
The balance of payments records all transactions between a country and the rest of the world. The current account includes trade in goods and services, primary income (investment earnings), and secondary income (transfers). A current account deficit must be matched by a financial account surplus (capital inflows). Exchange rates are determined by supply and demand in foreign exchange markets. A depreciation makes exports cheaper and imports dearer, potentially improving the trade balance if the Marshall-Lerner condition holds (sum of PED for exports and imports > 1).
国际收支记录了一国与世界其他地区之间的所有交易。经常账户包括货物与服务贸易、初次收入（投资收益）和二次收入（转移支付）。经常账户逆差必须由金融账户顺差（资本流入）来匹配。汇率由外汇市场的供求决定。本币贬值使出口更便宜、进口更昂贵，若满足马歇尔-勒纳条件（出口与进口的需求弹性之和 > 1），则有可能改善贸易余额。
Fixed exchange rate systems require central bank intervention to maintain the peg; floating rates adjust automatically. Managed floats combine market determination with occasional intervention. The choice of regime affects the autonomy of domestic monetary policy — a country pursuing a fixed exchange rate largely loses the ability to set interest rates independently of the anchor currency.
固定汇率制度需要央行干预以维持盯住；浮动汇率则自动调节。管理浮动结合了市场决定和偶尔干预。汇率制度的选择影响国内货币政策的自主性——追求固定汇率国家在很大程度上失去了独立于锚货币设定利率的能力。
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