Year 11 CAIE Economics: Key Concepts Revision | Year 11 CAIE 经济：核心知识点梳理

📚 Year 11 CAIE Economics: Key Concepts Revision | Year 11 CAIE 经济：核心知识点梳理

Welcome to this comprehensive revision guide covering the core knowledge areas for CAIE IGCSE Economics. Year 11 is a pivotal stage where students consolidate their understanding of microeconomic and macroeconomic principles, preparing for the final examinations. This article breaks down the essential topics into digestible, bilingual sections to support your learning and revision.

欢迎阅读这份涵盖CAIE IGCSE经济学核心知识领域的综合复习指南。Year 11是学生巩固微观与宏观经济原理理解、备战最终考试的关键阶段。本文将这些重点主题拆解为易于消化的中英双语小节，助力您的学习与复习。

1. Scarcity and Choice | 稀缺性与选择

The basic economic problem arises because human wants are unlimited, yet resources are scarce. This forces individuals, firms, and governments to make choices. The opportunity cost is the next best alternative forgone when a choice is made.

基本经济问题源自人类欲望的无限性与资源的稀缺性。这迫使个人、企业和政府做出选择。机会成本是指做出一种选择时所放弃的次优替代品。

A production possibility curve (PPC) shows the maximum combinations of two goods an economy can produce using all resources efficiently. Points inside the curve represent unemployed resources, while points outside are unattainable. Economic growth shifts the PPC outward.

生产可能性曲线(PPC)展示了一个经济体在充分利用所有资源下所能生产的两种商品的最大组合。曲线内的点表示资源未充分利用，曲线外的点无法达到。经济增长会使PPC向外移动。

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2. Demand, Supply and Market Equilibrium | 需求、供给与市场均衡

The law of demand states that, ceteris paribus, as price rises, quantity demanded falls, leading to a downward-sloping demand curve. Conversely, the law of supply indicates that as price rises, quantity supplied increases, producing an upward-sloping supply curve.

需求法则指出，在其他条件不变的情况下，价格上升则需求量下降，形成向下倾斜的需求曲线。相反，供给法则表明价格上升则供给量增加，形成向上倾斜的供给曲线。

Market equilibrium occurs where the demand and supply curves intersect. At the equilibrium price, quantity demanded equals quantity supplied. A price above equilibrium creates a surplus, while a price below creates a shortage.

市场均衡出现在需求曲线与供给曲线的交点处。在均衡价格下，需求量等于供给量。价格高于均衡会导致过剩，价格低于均衡会导致短缺。

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3. Price Elasticity of Demand and Supply | 需求价格弹性与供给价格弹性

Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price. It is calculated as:

PED = (%Δ quantity demanded) / (%Δ price)

需求价格弹性(PED)衡量需求量对价格变动的反应程度。计算公式为：

PED = (%Δ需求量) / (%Δ价格)

If PED > 1, demand is elastic; if PED < 1, it is inelastic; if PED = 1, it is unit elastic. Key determinants include the availability of substitutes, the degree of necessity, and the time period considered.

若PED > 1，需求富有弹性；PED < 1则缺乏弹性；PED = 1为单位弹性。主要决定因素包括替代品的可得性、商品的必需程度以及所考虑的时间跨度。

Price elasticity of supply (PES) is similarly defined, measuring the responsiveness of quantity supplied to a price change. Supply tends to be more elastic in the long run as firms can adjust all factors of production.

供给价格弹性(PES)定义类似，衡量供给量对价格变动的反应程度。长期中供给通常更具弹性，因为企业可以调整所有生产要素。

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4. Market Failure and Government Intervention | 市场失灵与政府干预

Market failure occurs when the price mechanism fails to allocate resources efficiently. Key causes include externalities, public goods, and information asymmetry. Negative externalities, such as pollution, lead to overproduction, while positive externalities lead to underproduction.

市场失灵指价格机制无法有效配置资源。主要原因包括外部性、公共物品和信息不对称。负外部性（如污染）导致生产过剩，而正外部性导致生产不足。

Governments intervene through indirect taxes (to internalize negative externalities), subsidies (to encourage positive externalities), regulations, and the provision of public goods. They may also set maximum or minimum prices.

政府通过间接税（使负外部性内部化）、补贴（鼓励正外部性）、法规以及提供公共物品进行干预。政府也可能设定最高或最低限价。

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5. Costs, Revenues and Firm Objectives | 成本、收益与企业目标

In the short run, firms face fixed costs (e.g., rent) and variable costs (e.g., raw materials). Total cost (TC) = Total Fixed Cost (TFC) + Total Variable Cost (TVC). Average cost (AC) = TC / output.

在短期，企业面临固定成本（如租金）和可变成本（如原材料）。总成本(TC)=总固定成本(TFC)+总可变成本(TVC)。平均成本(AC)=TC/产量。

Total revenue (TR) = price × quantity sold. A firm’s objective is normally profit maximization, where profit = TR – TC. This occurs at the output level where marginal cost (MC) equals marginal revenue (MR).

总收益(TR)=价格×销售量。企业的目标通常是利润最大化，利润=TR-TC。利润最大化出现在边际成本(MC)等于边际收益(MR)的产量水平。

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6. Market Structures | 市场结构

The main market structures in IGCSE Economics are perfect competition, monopoly, oligopoly, and monopolistic competition. They differ in the number of firms, type of product, barriers to entry, and influence over price.

IGCSE经济中的主要市场结构包括完全竞争、垄断、寡头和垄断竞争。它们在厂商数量、产品类型、进入壁垒和对价格的影响力方面各不相同。

Feature	Perfect Competition	Monopoly	Oligopoly
Number of firms	Many	One	Few large firms
Barriers to entry	None	High	High
Price-setting power	Price taker	Price maker	Interdependent

Monopolistic competition combines elements of both: many firms sell slightly differentiated products, with low barriers to entry.

垄断竞争则结合了两者的特点：许多企业销售略有差异的产品，进入壁垒较低。

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7. Labour Market and Trade Unions | 劳动力市场与工会

Wages are determined by the demand for and supply of labour. Demand for labour is derived from the demand for goods and services, while supply depends on factors such as working conditions, qualifications, and the size of the working population.

工资由劳动力的需求与供给决定。劳动力需求源自对产品和服务的需求，而劳动力供给取决于工作条件、资质和劳动人口规模等因素。

Trade unions are organizations that represent workers’ interests, aiming to improve wages, working conditions, and job security. They can bargain collectively, and if negotiations fail, they may take industrial action such as strikes. However, union power can be limited by factors like unemployment and legislation.

工会是代表工人利益的组织，旨在提高工资、改善工作条件和保障就业安全。工会可以进行集体谈判，若谈判失败可能采取罢工等劳工行动。然而，工会的力量会受到失业率和立法等因素的限制。

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8. Macroeconomic Objectives and Policies | 宏观经济目标与政策

Governments typically pursue four main macroeconomic objectives: sustainable economic growth, low and stable inflation, low unemployment, and a satisfactory balance of payments on the current account. These objectives can sometimes conflict with each other.

政府通常追求四大宏观经济目标：可持续的经济增长、低且稳定的通胀、低失业率以及令人满意的国际收支经常账户平衡。这些目标有时会相互冲突。

Fiscal policy involves changes in government spending and taxation to influence the economy. Monetary policy adjusts interest rates and the money supply, typically managed by a central bank. Supply-side policies aim to increase the productive potential of the economy.

财政政策通过改变政府支出和税收来影响经济。货币政策则调整利率和货币供应量，通常由中央银行管理。供给侧政策旨在提高经济的生产潜力。

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9. International Trade and Exchange Rates | 国际贸易与汇率

Countries trade because of the principle of comparative advantage: even if one country is more efficient in producing all goods, both can still gain from specialization and trade. Free trade increases global output and consumer choice.

各国进行贸易基于比较优势原理：即使一国在生产所有商品上都更有效率，两国仍能从专业化和贸易中获益。自由贸易提高了全球产出和消费者选择。

Protectionism involves measures such as tariffs, quotas, and subsidies to domestic producers. While it can protect infant industries and jobs, it often leads to higher prices and inefficiency.

保护主义涉及关税、配额和对国内生产者的补贴等措施。虽然能保护幼稚产业和就业，但往往导致价格上涨和效率低下。

Exchange rates can be floating, fixed, or managed. A depreciation of a currency makes exports cheaper and imports dearer, while an appreciation has the opposite effect. Exchange rate movements affect a country’s trade balance and inflation.

汇率可以是浮动、固定或有管理的浮动。本币贬值会使出口更便宜、进口更昂贵，升值则产生相反效果。汇率变动会影响一国的贸易平衡和通货膨胀。

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10. Economic Development and Globalization | 经济发展与全球化

Economic development refers to improvements in living standards, health, education, and freedom, moving beyond just GDP growth. The Human Development Index (HDI) combines life expectancy, education, and real national income per capita to measure development.

经济发展指生活水平、医疗、教育和自由度等方面的改善，而不仅是GDP增长。人类发展指数(HDI)综合了预期寿命、教育和人均实际国民收入来衡量发展水平。

Globalization is the increasing integration of economies through trade, capital flows, technology, and migration. Multinational corporations (MNCs) drive globalization but can bring both benefits, such as job creation, and drawbacks, such as environmental damage.

全球化是通过贸易、资本流动、技术和移民实现的经济日益一体化。跨国公司在推动全球化的同时既带来了创造就业等好处，也带来了环境破坏等弊端。

Understanding these core topics provides a solid foundation for success in the CAIE IGCSE Economics examination. Revise regularly, practice past papers, and apply real-world examples to strengthen your answers.

理解这些核心主题为在CAIE IGCSE经济学考试中取得成功奠定了坚实基础。定期复习、练习历年真题并应用现实案例，有助于强化你的答题能力。

Published by TutorHao | Economics Revision Series | aleveler.com

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