📚 GCSE Economics: End-of-Term Revision Guide | GCSE 经济：期末复习提纲
This comprehensive revision guide is designed to help GCSE Economics students consolidate key concepts, definitions, and applications before the final exams. The guide mirrors the core topics covered by major exam boards and emphasises clarity, real-world examples, and exam technique. By working through each section and testing your understanding with practice questions, you can strengthen your grasp of both Microeconomics and Macroeconomics.
这份综合复习提纲旨在帮助GCSE经济学的学生在期末考试前巩固关键概念、定义和应用。提纲涵盖了主要考试局的核心主题，强调清晰度、现实案例和考试技巧。通过逐一学习每个部分并用练习题检验理解，你可以加深对微观经济学和宏观经济学的掌握。
1. The Economic Problem | 基本经济问题
The fundamental economic problem is scarcity: resources are finite while human wants are infinite. This forces societies to make choices about what to produce, how to produce, and for whom to produce. Scarcity exists because factors of production are limited relative to unlimited desires.
根本的经济问题是稀缺性：资源是有限的，而人类的欲望是无限的。这迫使社会对生产什么、如何生产以及为谁生产做出选择。稀缺性的存在是因为相对于无限的欲望而言，生产要素是有限的。
Opportunity cost is the next best alternative forgone when an economic decision is made. Understanding trade-offs helps individuals, businesses, and governments allocate resources efficiently. Every choice involves a sacrifice, and identifying the true opportunity cost sharpens decision-making.
机会成本是在做出经济决策时所放弃的次优替代方案。理解权衡取舍有助于个人、企业和政府有效配置资源。每一个选择都涉及牺牲，识别真实的机会成本能让决策更加敏锐。
All economies must answer three basic questions: What goods and services should be produced? How should they be produced? And for whom should they be produced? Different economic systems — market, planned, and mixed — answer these questions in fundamentally different ways, affecting efficiency and equity.
所有经济体都必须回答三个基本问题：应生产哪些商品和服务？应如何生产？应为谁生产？不同的经济制度——市场经济、计划经济和混合经济——以根本不同的方式回答这些问题，影响着效率与公平。
2. Factors of Production | 生产要素
The four factors of production are land (natural resources), labour (human effort), capital (man-made goods used in production), and enterprise (the willingness to take risks and organise the other factors). Each factor plays a distinct role in generating output.
四种生产要素是土地（自然资源）、劳动（人力投入）、资本（用于生产的人造物品）和企业（承担风险并组织其他要素的意愿）。每种要素在创造产出中都发挥着独特的作用。
Each factor earns a reward: rent for land, wages for labour, interest for capital, and profit for enterprise. The quality and quantity of these factors determine a country’s productive potential. Improvements in human capital or technology shift the production possibility frontier outward.
每种要素都获得相应的回报：土地获得地租，劳动获得工资，资本获得利息，企业获得利润。这些要素的质量和数量决定了一个国家的生产潜力。人力资本或技术的改进会使生产可能性边界向外移动。
Factor mobility refers to how easily resources can be moved from one use to another. Geographical mobility (movement of labour to different locations) and occupational mobility (changing jobs or industries) are key concepts in labour markets. Immobility can lead to structural unemployment if workers’ skills do not match available jobs.
要素流动性是指资源从一种用途转移到另一种用途的难易程度。地理流动性（劳动力迁移到不同地点）和职业流动性（更换工作或行业）是劳动力市场中的关键概念。如果工人的技能与现有岗位不匹配，流动性不足可能导致结构性失业。
3. Supply and Demand | 供给与需求
Demand is the quantity of a good or service that consumers are willing and able to buy at a given price over a period of time. The law of demand states that, ceteris paribus, as price falls, quantity demanded rises. The downward-sloping demand curve reflects this inverse relationship.
需求是在一定时期内，消费者在给定价格下愿意并能够购买的商品或服务的数量。需求定律指出，在其他条件不变的情况下，价格下降，需求量上升。向下倾斜的需求曲线反映了这种反向关系。
Supply is the quantity that producers are willing and able to sell at a given price over a period. The law of supply states that, ceteris paribus, as price rises, quantity supplied rises. The upward-sloping supply curve shows that higher prices incentivise firms to produce more.
供给是在一定时期内，生产者在给定价格下愿意并能够出售的数量。供给定律指出，在其他条件不变的情况下，价格上升，供给量上升。向上倾斜的供给曲线表明，较高的价格激励企业生产更多。
The equilibrium price is where demand equals supply. Shifts in the demand or supply curves, caused by factors like income, tastes, production costs, or technology, lead to a new equilibrium price and quantity. Markets automatically adjust to clear any surplus or shortage.
均衡价格是需求与供给相等时的价格。由于收入、偏好、生产成本或技术等因素引起的需求曲线或供给曲线的移动，会导致新的均衡价格和数量。市场会自动调整以消除任何过剩或短缺。
A table of common demand and supply shifters:
常见的需求与供给变动因素表：
| Demand Shifters (需求变动因素) | Supply Shifters (供给变动因素) |
|---|---|
| Changes in income (收入变动) | Production costs (生产成本) |
| Tastes and preferences (偏好) | Technology (技术) |
| Prices of substitutes/complements (替代品/互补品价格) | Indirect taxes and subsidies (间接税与补贴) |
| Population and demographics (人口结构) | External shocks (外部冲击) |
Understanding these shifts is essential for analysing how markets adjust and for evaluating government policies like taxes and subsidies. Always distinguish between a movement along the curve and a shift of the entire curve.
理解这些变动对于分析市场如何调整以及评估税收和补贴等政府政策至关重要。务必区分沿着曲线的移动与整条曲线的平移。
4. Elasticity | 弹性
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price. It is calculated as:
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 = % change in quantity demanded ÷ % change in price
PED = 需求量变动百分比 ÷ 价格变动百分比
If PED > 1, demand is elastic; if PED < 1, demand is inelastic; if PED = 1, unit elastic. Factors affecting PED include the availability of substitutes, the degree of necessity, brand loyalty, and the time period considered.
如果PED > 1，需求富有弹性；如果PED < 1，需求缺乏弹性；如果PED = 1，单位弹性。影响PED的因素包括替代品的可得性、必需程度、品牌忠诚度以及所考虑的时间周期。
Price elasticity of supply (PES) measures the responsiveness of quantity supplied to a price change. In the short run, supply tends to be inelastic; in the long run, it becomes more elastic as firms can expand capacity. The main determinants are spare production capacity, stock levels, and the time frame.
供给价格弹性（PES）衡量供给量对价格变动的反应程度。短期中供给往往缺乏弹性；长期中，由于企业可以扩大产能，供给变得更富有弹性。主要决定因素包括闲置产能、库存水平和时间范围。
Income elasticity of demand (YED) indicates how demand changes with consumer income. Normal goods have positive YED; inferior goods have negative YED. Luxury goods have YED > 1, while necessities have YED between 0 and 1.
需求收入弹性（YED）显示需求如何随消费者收入变化而变化。正常品具有正的YED；低档品具有负的YED。奢侈品YED > 1，必需品YED介于0和1之间。
Cross elasticity of demand (XED) measures the relationship between two goods. Positive XED indicates substitutes; negative XED indicates complements. The size of the coefficient reveals how closely related the goods are.
需求交叉弹性（XED）衡量两种商品之间的关系。正的XED表示替代品；负的XED表示互补品。系数的大小揭示了商品之间的关联紧密程度。
5. 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. Common causes include externalities, public goods, information gaps, and market power. When a market fails, government intervention may be justified to restore efficiency.
当自由市场未能有效配置资源，导致社会净福利损失时，就会发生市场失灵。常见的原因包括外部性、公共物品、信息不对称和市场势力。当市场失灵时，政府干预或许有理由恢复效率。
Negative externalities, such as air pollution from a factory, create external costs not reflected in the market price. The social cost exceeds the private cost, causing overproduction. Diagrammatically, the marginal social cost (MSC) curve lies above the marginal private cost (MPC) curve.
负外部性，例如工厂的空气污染，产生了未反映在市场价格中的外部成本。社会成本大于私人成本，导致过度生产。在图形上，边际社会成本（MSC）曲线位于边际私人成本（MPC）曲线上方。
Positive externalities, such as education or vaccination, generate external benefits. The social benefit exceeds the private benefit, leading to underconsumption if left to the market. The marginal social benefit (MSB) curve lies above the marginal private benefit (MPB) curve.
正外部性，如教育或疫苗接种，产生外部收益。社会收益大于私人收益，若任由市场配置将导致消费不足。边际社会收益（MSB）曲线位于边际私人收益（MPB）曲线上方。
Public goods are non-excludable and non-rivalrous, meaning once provided, no one can be prevented from using them, and one person’s use does not reduce availability. Examples include street lighting and flood defences. These are typically underprovided by the market due to the free-rider problem.
公共物品具有非
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