📚 IB Economics: Mind Map Quick Revision | IB 经济：思维导图速记
The IB Economics syllabus is expansive, covering microeconomics, macroeconomics, international economics and development economics. Using mind maps lets you condense vast content into memorable visual structures, strengthening recall through logical connections. This article takes you through a series of mind-map branches designed for rapid revision, so you can mentally walk through the entire course with confidence.
IB 经济学大纲涵盖微观、宏观、国际和发展经济学，内容广泛。使用思维导图可将庞大的知识点浓缩为便于记忆的视觉结构，通过逻辑连接强化记忆召回。本文将带你遍历一系列为快速复习打造的思维导图分支，让你能够自信地在脑海中走过整个课程。
1. The Power of a Revision Mind Map | 复习思维导图的力量
Start with a central node titled ‘IB Economics’ and draw four main branches: Micro, Macro, International and Development. From each, extend sub-branches with keywords for theories, diagrams, real-world examples and evaluation points. Use arrows to capture causal chains – for instance, an interest rate cut raises investment, which shifts AD right. This method transforms passive revision into an active, interconnected visual journey.
从中心节点“IB经济学”开始，画出四个主分支：微观、宏观、国际和发展。从每一支延伸出子分支，用关键词记录理论、图表、实际案例和评估点。用箭头捕捉因果链条——例如，降息刺激投资，进而使总需求右移。这种方法能让被动复习变成主动的、相互关联的视觉旅程。
2. Microeconomics Foundation Mind Map | 微观经济学基础导图
Central node: Microeconomics → Scarcity, Opportunity Cost, Production Possibility Frontier (PPF), Economic Systems. Scarcity forces choices; opportunity cost is the next best alternative forgone. The PPF models maximum output combinations, illustrating trade-offs, unemployment and economic growth when the curve shifts outward.
中心节点：微观经济学 → 稀缺性、机会成本、生产可能性边界（PPF）、经济体系。稀缺性迫使做出选择；机会成本是放弃的次优选项。PPF 模型展示了最大产出组合，刻画了权衡、失业以及曲线外移所代表的经济增长。
Economic systems – free market, planned and mixed – determine resource allocation. Free markets rely on price signals; planned economies centralise decisions. Most IB examples involve mixed economies with varying degrees of government intervention, a link to later market failure topics.
经济体系——自由市场、计划经济和混合经济——决定资源配置。自由市场依赖价格信号；计划经济集中决策。IB 的案例大多是混合经济，带有不同程度的政府干预，由此连接到后面关于市场失灵的章节。
3. Demand, Supply and Market Equilibrium | 需求、供给与市场均衡
Mind map core: Market → Demand (law, determinants, movement vs shift), Supply, Equilibrium, Price Mechanism. The law of demand: when price rises, quantity demanded contracts; supply: when price rises, quantity supplied expands. A change in own price causes a movement along the curve, while changes in determinants (income, tastes, costs, technology) shift the entire curve.
思维导图核心：市场 → 需求（定律、决定因素、移动与移动的区别）、供给、均衡、价格机制。需求定律：价格上升，需求量收缩；供给定律：价格上升，供给量扩张。自身价格变动导致沿曲线移动，而决定因素（收入、品味、成本、技术）变动则导致整条曲线移动。
Equilibrium occurs where demand equals supply. Disequilibrium creates shortages (excess demand) or surpluses (excess supply). The price mechanism acts as a signalling, incentive and rationing device, guiding resources towards desired uses – a foundational idea for efficiency analysis.
均衡出现在需求等于供给之处。非均衡产生短缺（超额需求）或过剩（超额供给）。价格机制发挥信号、激励和配给作用，引导资源流向需要的用途——这是效率分析的基础理念。
4. Elasticities Mind Map | 弹性导图
Branch out: PED, YED, XED, PES. Each with formula, determinants and policy applications.
分支：需求价格弹性（PED）、需求收入弹性（YED）、需求交叉弹性（XED）、供给价格弹性（PES）。各自包含公式、决定因素和政策应用。
PED = %ΔQd ÷ %ΔP
PED magnitude determines price sensitivity. If elastic (|PED| > 1), a price cut raises total revenue; if inelastic (|PED| < 1), a price rise boosts revenue. Determinants: availability of substitutes, luxury vs necessity, time horizon. YED = %ΔQd ÷ %ΔY; positive for normal goods, negative for inferior goods. XED = %ΔQdA ÷ %ΔPB, indicating substitutes (positive) or complements (negative). PES measures responsiveness of quantity supplied; influenced by production time, spare capacity and storage ability.
PED 的绝对值决定价格敏感度。若弹性充足（|PED| > 1），降价增加总收益；若弹性不足（|PED| < 1），提价增加总收益。决定因素：替代品可得性、必需品与奢侈品、时间周期。YED = 需求量变动百分比 ÷ 收入变动百分比；正常品为正，劣等品为负。XED = 商品A需求量变动百分比 ÷ 商品B价格变动百分比，正值为替代品，负值为互补品。PES 衡量供给量反应程度；受生产时间、闲置产能和储存能力影响。
These tools prove essential when evaluating the impact of taxes, subsidies and minimum pricing. For instance, indirect taxes on inelastic demand raise more government revenue with smaller quantity reductions.
这些工具对评估税收、补贴和最低限价的影响至关重要。例如，对缺乏弹性的需求征收间接税，能在减少较少购买量的前提下带来更多政府收入。
5. Government Intervention and Market Failure | 政府干预与市场失灵导图
Draw a branch: Market Failure → Externalities, Public Goods, Information Asymmetry. Then Intervention → Indirect Taxes, Subsidies, Price Controls, Regulation.
画出分支：市场失灵 → 外部性、公共物品、信息不对称；接着干预 → 间接税、补贴、价格控制、监管。
Negative production externalities cause overproduction because MSC > MPC. A specific tax equal to the external cost internalises the externality, shifting supply left towards the socially optimal level. Positive consumption externalities (MSB > MPB) justify subsidies like those for education or healthcare. Price ceilings (below equilibrium) cause shortages and black markets; price floors (above equilibrium) generate surpluses and require government purchase. Public goods are non-rival and non-excludable, leading to free-riding and the need for direct provision. Governments may also use tradable permits (e.g., carbon trading) to tackle pollution at the lowest cost.
负生产外部性导致生产过度，因为边际社会成本 MSC > 边际私人成本 MPC。征收等于外部成本数额的从量税可以将外部性内部化，推动供给曲线左移至社会最优水平。正消费外部性（MSB > MPB）为教育、医疗等补贴提供了理由。价格上限（低于均衡）导致短缺和黑市；价格下限（高于均衡）产生过剩并需要政府收购。公共物品具有非竞争性和非排他性，引发搭便车问题，需要政府直接提供。政府还可采用可交易许可证（如碳排放交易）以最低成本治理污染。
6. Macroeconomic Measurement and Goals | 宏观经济测量与目标导图
Core: Macroeconomic Goals → Economic Growth, Low Unemployment, Stable Inflation, Balance of Payments Equilibrium, Equitable Income Distribution. Measurement nodes follow from each.
核心：宏观经济目标 → 经济增长、低失业率、稳定通胀、国际收支平衡、公平收入分配。每一目标下设置相应的测量节点。
Real GDP growth is measured via expenditure (C+I+G+X−M), income or output methods. Unemployment is captured by the labour force survey or claimant count; types include cyclical, structural, frictional and seasonal. Inflation is tracked through the CPI; causes include demand‑pull and cost‑push factors. The current account of the balance of payments records trade in goods, services, primary income and secondary income. Equitable distribution is indicated by the Gini coefficient or Lorenz curve. These indicators often conflict – for example, rapid growth can cause demand‑pull inflation and worsen the current account.
实际 GDP 增长通过支出法（C+I+G+X−M）、收入法或产出法衡量。失业数据来自劳动力调查或申领人数；类型包括周期性、结构性、摩擦性和季节性。通胀通过CPI追踪；成因包括需求拉动和成本推动。国际收支经常账户记录货物、服务、初次收入和二次收入流动。公平分配用基尼系数或洛伦兹曲线表示。这些指标常常互相冲突——例如，快速增长可能引发需求拉动型通胀并使经常账户恶化。
7. Aggregate Demand and Aggregate Supply | 总需求与总供给导图
AD–AS Model → AD (C+I+G+X−M), SRAS, LRAS (Keynesian vs New Classical). AD slopes downward due to wealth, interest rate and net export effects. SRAS slopes upward because of sticky wages or menu costs; shifts with input prices, productivity and supply shocks. In the New Classical view, LRAS is vertical at full‑employment output. The Keynesian LRAS is horizontal at low output, showing spare capacity, becoming vertical only at full employment.
AD–AS 模型 → 总需求（C+I+G+X−M）、短期总供给 SRAS、长期总供给 LRAS（凯恩斯与新古典之分）。总需求因财富效应、利率效应和净出口效应向右下倾斜。短期总供给因工资粘性或菜单成本斜向上；随投入价格、生产率和供给冲击移动。在新古典观点中，长期总供给在充分就业产出处垂直。凯恩斯长期总供给在产出较低时保持水平，显示闲置产能，仅在充分就业时才垂直。
Macroeconomic equilibrium determines real GDP and the price level. An inflationary gap exists when equilibrium exceeds full employment; a deflationary gap means unemployment above the natural rate. Understanding these gaps links directly to policy evaluation.
宏观经济均衡决定实际GDP和价格水平。当均衡超过充分就业时，存在通胀缺口；当失业率高于自然失业率时，则出现通缩缺口。理解这些缺口可以直接连接到政策评估。
8. Macroeconomic Policy Mind Map | 宏观经济政策导图
Policy branches: Fiscal (G, T), Monetary (interest rates, money supply, quantitative easing), Supply‑Side (market‑based and interventionist). Expansionary fiscal policy raises AD through higher spending or tax cuts; contractionary does the opposite. Automatic stabilisers — progressive taxes and welfare benefits — dampen the cycle without active decisions. Monetary policy uses interest rate changes to influence borrowing, investment and the exchange rate; quantitative easing purchases assets to inject liquidity when rates are near zero.
政策分支：财政政策（政府支出 G、税收 T）、货币政策（利率、货币供给、量化宽松）、供给侧政策（基于市场与干预主义）。扩张性财政政策通过增加支出或减税提升总需求；紧缩性反之。自动稳定器——累进税和福利补贴——无需主动决策即可平抑周期。货币政策运用利率变化影响借贷、投资和汇率；量化宽松在利率接近零时购买资产注入流动性。
Supply‑side policies aim to shift LRAS right: investment in education and infrastructure, tax reforms to incentivise work, deregulation and privatisation. Evaluators consider time lags, crowding out, the liquidity trap and the relative strength of monetary transmission in a recession.
供给侧政策旨在右移长期总供给：投资教育与基础设施、激励工作的税制改革、放松监管及私有化。评估者需考虑时滞、挤出效应、流动性陷阱以及衰退期间货币传导机制的相对强度。
9. International Trade and Protectionism | 国际贸易与保护主义导图
Trade node: Comparative Advantage (Ricardo), Gains from Trade, Terms of Trade, Protectionism (tariffs, quotas
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