📚 A-Level Edexcel Economics End-of-Term Revision Guide | A-Level Edexcel 经济：期末复习提纲
Welcome to your end-of-term revision guide for Edexcel A-Level Economics. This recap will take you through the core microeconomic and macroeconomic concepts you have studied this term, helping you to identify strengths and areas for improvement. Use it alongside your notes and past papers to ace your upcoming assessments.
欢迎阅读Edexcel A-Level经济学期末复习指南。这份回顾将带你梳理本学期学过的核心微观与宏观经济概念，帮助你发现强项和需要加强的地方。配合你的笔记和历年真题使用，在即将到来的评估中取得佳绩。
1. The Economic Problem and Resource Allocation | 经济问题与资源配置
The fundamental economic problem is scarcity: finite resources and infinite wants. This forces individuals, firms, and governments to make choices about what to produce, how to produce, and for whom to produce.
基本的经济问题是稀缺性：有限的资源与无限的欲望。这迫使个人、企业和政府在“生产什么”、“如何生产”和“为谁生产”之间做出选择。
Opportunity cost is the cost of the next best alternative foregone when a choice is made. All decisions involve opportunity costs, which are central to economic reasoning.
机会成本是做出选择时所放弃的次优选项的价值。所有决策都涉及机会成本，这是经济推理的核心。
Production possibility frontiers (PPFs) illustrate maximum output combinations of two goods with given resources. Points on the curve are efficient, inside are inefficient, and outward shifts indicate economic growth.
生产可能性边界（PPF）展示在给定资源下两种商品的最大产出组合。曲线上的点表示有效率，内部点表示无效率，曲线外移表示经济增长。
2. Demand, Supply, and Market Equilibrium | 需求、供给与市场均衡
Demand is the quantity of a good consumers are willing and able to buy at various prices, ceteris paribus. The law of demand states that as price rises, quantity demanded falls, leading to a downward-sloping demand curve.
需求是消费者在各种价格下愿意且能够购买的商品数量，假设其他条件不变。需求定律指出，价格上升时需求量下降，因此需求曲线向下倾斜。
Shifts in demand are caused by changes in income, tastes, prices of related goods (substitutes and complements), expectations, and the number of buyers. A shift to the right represents an increase in demand.
收入、偏好、相关商品（替代品和互补品）价格、预期以及购买者数量的变化会导致需求曲线的移动。需求曲线右移表示需求增加。
Supply is the quantity producers are willing and able to sell at various prices. The law of supply indicates a positive relationship between price and quantity supplied, giving an upward-sloping supply curve.
供给是生产者在各种价格下愿意且能够出售的数量。供给定律表明价格与供给量之间呈正相关关系，供给曲线向上倾斜。
Equilibrium occurs where the demand and supply curves intersect. Any price above equilibrium creates a surplus; below equilibrium creates a shortage. Market forces move the price toward equilibrium.
均衡出现在需求曲线与供给曲线的交点处。高于均衡价格会产生过剩，低于均衡价格则产生短缺。市场力量会使价格趋向均衡。
3. Elasticity of Demand and Supply | 需求与供给弹性
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price: PED = (%ΔQd) ÷ (%ΔP). Demand is elastic when |PED| > 1, inelastic when |PED| < 1, and unit elastic when |PED| = 1.
需求价格弹性（PED）衡量需求量对价格变化的反应程度：PED = (%ΔQd) ÷ (%ΔP)。当 |PED| > 1 时需求富有弹性，|PED| < 1 时缺乏弹性，|PED| = 1 时为单位弹性。
Determinants of PED include availability of substitutes, necessity versus luxury, proportion of income spent, and time period. Goods with close substitutes tend to have more elastic demand.
PED 的决定因素包括替代品的可获得性、必需品与奢侈品、占收入的比例以及时间长度。具有相近替代品的商品需求往往更具弹性。
Income elasticity of demand (YED) = (%ΔQd) ÷ (%ΔY). Normal goods have positive YED; inferior goods have negative YED. Luxury goods have YED > 1.
需求收入弹性（YED）= (%ΔQd) ÷ (%ΔY)。正常商品具有正的 YED；低档商品具有负的 YED。奢侈品的 YED > 1。
Price elasticity of supply (PES) = (%ΔQs) ÷ (%ΔP). It is influenced by production time, availability of stocks, spare capacity, and the complexity of the production process.
供给价格弹性（PES）= (%ΔQs) ÷ (%ΔP)。其影响因素包括生产时间、库存可得性、闲置产能以及生产过程的复杂程度。
4. Market Efficiency and Welfare | 市场效率与福利
Consumer surplus is the difference between what consumers are willing to pay and what they actually pay. Producer surplus is the difference between the market price and the minimum price producers are willing to accept.
消费者剩余是消费者愿意支付的最高价格与实际支付价格之间的差额。生产者剩余是市场价格与生产者愿意接受的最低价格之间的差额。
Allocative efficiency occurs when resources are distributed to maximise social welfare, where price equals marginal cost (P = MC). Productive efficiency occurs when goods are produced at the lowest possible cost.
配置效率发生在资源分配使社会福利最大化时，此时价格等于边际成本（P = MC）。生产效率是指以尽可能低的成本生产商品。
A perfectly competitive market in a vacuum can achieve both allocative and productive efficiency in the long run. However, real-world market structures often lead to market failures.
在理想状态下，完全竞争市场在长期能够同时实现配置效率和生产效率。然而，现实中的市场结构常常导致市场失灵。
5. Market Failure: Externalities and Public Goods | 市场失灵：外部性与公共物品
Market failure arises when the free market fails to allocate resources efficiently. Key causes include externalities, public goods, information asymmetries, and market power.
当自由市场未能有效配置资源时，就会出现市场失灵。主要原因包括外部性、公共物品、信息不对称和市场势力。
Negative production externalities (e.g., pollution) cause social costs to exceed private costs, leading to overproduction. The marginal social cost (MSC) curve lies above the marginal private cost (MPC) curve.
负生产外部性（如污染）使得社会成本超过私人成本，导致生产过剩。边际社会成本（MSC）曲线位于边际私人成本（MPC）曲线上方。
Positive consumption externalities (e.g., vaccinations) have social benefits greater than private benefits, resulting in underconsumption. The marginal social benefit (MSB) curve lies above the marginal private benefit (MPB) curve.
正消费外部性（如疫苗接种）的社会利益大于私人利益，导致消费不足。边际社会利益（MSB）曲线位于边际私人利益（MPB）曲线上方。
Public goods are non-excludable and non-rivalrous. The free-rider problem means the market will underprovide them, so government provision is often necessary.
公共物品具有非排他性和非竞争性。搭便车问题意味着市场会提供不足，因此通常需要政府提供。
6. Government Intervention and Regulation | 政府干预与监管
To correct negative externalities, governments can impose indirect taxes (e.g., carbon taxes) equal to the external cost, shifting the supply curve to the left and reducing output to the socially optimal level.
为纠正负外部性，政府可以征收等于外部成本的间接税（如碳税），使供给曲线左移，将产量降至社会最优水平。
Subsidies can encourage positive externalities by lowering the cost of production/consumption, shifting the supply or demand curve to the right and increasing quantity to the socially desirable level.
补贴可通过降低生产或消费成本来鼓励正外部性，使供给或需求曲线右移，将数量提升至社会理想水平。
Regulation includes minimum prices (price floors) to guarantee producer incomes and maximum prices (price ceilings) to protect consumers. Tradable pollution permits create a market for emissions, incentivising firms to reduce pollution cost-effectively.
监管手段包括保证生产者收入的最低价格（价格下限）和保护消费者的最高价格（价格上限）。可交易的污染许可为排放权创造市场，激励企业以成本效益高的方式减少污染。
Government failure occurs when intervention leads to a net welfare loss, perhaps due to unintended consequences, information problems, or political considerations.
当干预导致净福利损失时，便会出现政府失灵，原因可能包括意外后果、信息问题或政治考量。
7. Aggregate Demand and its Components | 总需求及其组成部分
Aggregate demand (AD) is the total spending on goods and services in an economy at a given price level. AD = C + I + G + (X – M), where C is consumption, I is investment, G is government spending, and (X – M) is net exports.
总需求（AD）是在给定价格水平下一国经济中商品和服务的总支出。AD = C + I + G + (X – M)，其中 C 为消费，I 为投资，G 为政府支出，(X – M) 为净出口。
The AD curve slopes downward due to the wealth effect, interest-rate effect, and international trade effect. A fall in the price level boosts real wealth, lowers interest rates, and makes domestic goods more competitive, raising AD.
AD 曲线向下倾斜是由于财富效应、利率效应和国际贸易效应。价格水平下降会提高实际财富、降低利率并增强国内商品竞争力，从而增加总需求。
Shifts in AD can be caused by changes in consumer confidence, business expectations, fiscal policy, monetary policy, and external demand. A rise in any component shifts AD rightwards.
消费者信心、企业预期、财政政策、货币政策和外部需求的变化会导致 AD 移动。任何组成部分的增加都会使 AD 曲线右移。
8. Aggregate Supply and Macroeconomic Equilibrium | 总供给与宏观经济均衡
Short-run aggregate supply (SRAS) is upward-sloping because at least one factor price is fixed. Higher price levels increase profits and firms expand output. Factors such as input costs, productivity, and taxes shift the SRAS curve.
短期总供给（SRAS）曲线向上倾斜，因为
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