📚 Year 10 Edexcel Economics: Essential Knowledge Review | Edexcel经济学Year 10：核心知识点梳理
Welcome to this comprehensive review of essential Year 10 Edexcel Economics topics. This article consolidates the fundamental microeconomic concepts you need to master, equipping you with a clear and structured understanding of how individuals, businesses and governments make choices in the face of scarcity. Each section is presented in a paired English–Chinese format to support bilingual learning and deeper retention.
欢迎阅读这篇Year 10 Edexcel经济学核心知识点梳理。本文整合了你必须掌握的基础微观经济学概念，帮助你清晰、有条理地理解个人、企业和政府在稀缺性下如何做出选择。每节内容以英文–中文配对方式呈现，以辅助双语学习并强化记忆。
1. The Basic Economic Problem and Economic Systems | 基本经济问题与经济制度
The fundamental economic problem is scarcity: resources are limited, but human wants are endless. This forces all economic agents to make choices.
基本经济问题是稀缺性：资源有限，而人的欲望无穷。这迫使所有经济主体做出选择。
Scarcity leads to opportunity cost – the value of the next best alternative forgone when a choice is made.
稀缺性导致机会成本 – 做出选择时所放弃的次优选项的价值。
To tackle the basic economic problem, societies must answer three fundamental questions: What to produce? How to produce? For whom to produce?
为了解决基本经济问题，每个社会必须回答三个根本问题：生产什么？如何生产？为谁生产？
In a free market economy, resources are allocated through the price mechanism with minimal government interference.
在自由市场经济中，资源通过价格机制分配，政府干预极少。
In a planned (command) economy, the government owns most resources and makes centralised allocation decisions.
在计划经济中，政府拥有大部分资源并集中做出分配决策。
Most modern economies are mixed economies, combining features of both market and planned systems to balance efficiency and equity.
大多数现代经济体都是混合经济，结合了市场和计划两者的特征，以平衡效率与公平。
2. Factors of Production | 生产要素
Land – natural resources used in production. Its reward is rent.
土地 – 生产所用的自然资源。其报酬是租金。
Labour – human effort, both physical and mental. Its reward is wages/salaries.
劳动力 – 人类的体力和脑力劳动。其报酬是工资/薪水。
Capital – man‑made goods used to produce other goods, e.g. machinery. Its reward is interest.
资本 – 用于生产其他商品的人造物品，如机器。其报酬是利息。
Enterprise – the willingness to take risks and combine the other factors. Its reward is profit.
企业家精神 – 承担风险并组合其他生产要素的意愿。其报酬是利润。
The quality and quantity of factors determine an economy's productive capacity. Investment in education and technology can raise labour productivity and shift the production possibility frontier outwards.
生产要素的质量和数量决定了一个经济体的生产能力。对教育和技术的投资可以提高劳动生产率，并使生产可能性边界向外移动。
3. Opportunity Cost and the Production Possibility Curve | 机会成本与生产可能性曲线
Opportunity cost is the sacrifice of the next best alternative in decision‑making. It exists because of scarcity.
机会成本是决策过程中所牺牲的次优选择。它因稀缺性而存在。
A production possibility curve (PPC) shows the maximum combinations of two goods an economy can produce with full and efficient use of resources.
生产可能性曲线（PPC）展示了一个经济体在资源得到充分且有效利用时所能生产的两种商品的最大组合。
Points on the PPC represent productive efficiency. Points inside the curve indicate unemployed or inefficiently used resources.
位于PPC上的点代表生产效率。曲线内的点表示资源闲置或使用低效。
An outward shift of the PPC signifies economic growth, caused by more resources or technological progress.
PPC向外移动代表经济增长，原因可能包括资源增加或技术进步。
Moving along the PPC to produce more of one good incurs an increasing opportunity cost, giving the curve its typical concave shape.
沿着PPC增加一种商品的生产会带来递增的机会成本，使曲线呈典型的凹向原点形状。
4. Demand | 需求
The law of demand states that, ceteris paribus, as the price of a good falls, the quantity demanded increases.
需求定律指出，在其他条件不变时，商品价格下降，需求量上升。
A demand curve slopes downwards from left to right, illustrating the inverse relationship between price and quantity demanded.
需求曲线从左到右向下倾斜，反映了价格与需求量之间的反向关系。
A movement along the demand curve is caused solely by a change in the good's own price.
沿着需求曲线的移动仅由该商品自身价格的变化引起。
A shift of the entire demand curve occurs when non‑price determinants change. Key determinants include:
整个需求曲线的移动发生在非价格决定因素变化时。主要因素包括：
Income: For normal goods, higher income raises demand; for inferior goods, demand falls as income rises.
收入：对于正常商品，收入增加会提高需求；对于劣等商品，收入上升则需求下降。
Price of related goods: Substitutes – if the price of tea increases, demand for coffee rises. Complements – a fall in the price of smartphones tends to increase demand for phone cases.
相关商品价格：替代品 – 如果茶叶价格上升，咖啡需求增加。互补品 – 智能手机价格下降通常会推高手机壳的需求。
Tastes and preferences: Effective advertising or changing trends can shift demand rightwards.
消费者偏好：有效的广告或潮流的转变可使需求曲线右移。
Population and demographic changes also influence the overall market demand.
人口数量和结构的变化也会影响整体市场需求。
5. Supply | 供给
The law of supply states that, ceteris paribus, as the price of a good rises, the quantity supplied increases.
供给定律指出，在其他条件不变时，商品价格上升，供给量增加。
A supply curve slopes upwards, reflecting the direct relationship between price and quantity supplied.
供给曲线向上倾斜，反映了价格与供给量之间的正相关关系。
A change in the good's own price causes a movement along the supply curve.
商品自身价格的变化会引起供给曲线上点的移动。
Shifts of the supply curve are due to changes in the following non‑price determinants:
供给曲线的移动由以下非价格决定因素的变化引起：
Costs of production: An increase in raw material or energy costs reduces supply (shifts left).
生产成本：原材料或能源成本增加会减少供给（曲线左移）。
Technology: Technological improvements lower costs and increase supply (shifts right).
技术：技术进步降低成本并增加供给（曲线右移）。
Taxes and subsidies: An indirect tax raises costs and decreases supply; a subsidy lowers costs and boosts supply.
税收与补贴：间接税增加成本、减少供给；补贴降低成本、增加供给。
Weather and natural conditions are especially relevant for agricultural products.
天气和自然条件对农产品尤其重要。
Prices of related goods in production – if a farmer can grow wheat or barley, a rise in barley's price may reduce wheat supply.
关联生产品的价格 – 如果农民可以种植小麦或大麦，大麦价格上升可能减少小麦的供给。
6. Market Equilibrium and the Price Mechanism | 市场均衡与价格机制
Market equilibrium occurs where quantity demanded equals quantity supplied. The corresponding price is the equilibrium price.
市场均衡出现在需求量等于供给量之处。对应的价格即为均衡价格。
When the price is set above equilibrium, a surplus (excess supply) arises, putting downward pressure on price.
当价格设定在均衡价格之上时，会出现过剩（超额供给），从而给价格带来下行压力。
When the price is below equilibrium, a shortage (excess demand) emerges, driving the price upwards.
当价格低于均衡价格时，会出现短缺（超额需求），推动价格上升。
The price mechanism performs three key functions:
价格机制发挥三个关键功能：
Signalling function: Prices convey information to producers and consumers. A rising price signals producers to increase output.
信号功能：价格向生产者和消费者传递信息。价格上涨是生产者增加产量的信号。
Incentive function: Higher prices incentivise firms to supply more, while lower prices encourage consumers to purchase more.
激励功能：较高价格激励企业提供更多产品，较低价格鼓励消费者购买更多。
Rationing function: Scarce resources are allocated to those who are willing and able to pay the market price.
配给功能：稀缺资源被分配给愿意且有能力支付市场价格的人。
Market forces thus guide resource allocation without the need for central planning.
市场力量因此引导资源配置，无需中央计划。
7. Elasticity: Price Elasticity of Demand (PED) and Price Elasticity of Supply (PES) | 弹性：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.
需求价格弹性（PED）衡量需求量对价格变动的反应程度。
PED = (%ΔQd) / (%ΔP)
The value is usually expressed as a positive number (ignoring the minus sign). It can be classified as:
该值通常表示为正数（忽略负号）。可分为：
PED > 1: Elastic – quantity demanded changes proportionally more than price. Firms can lower price to raise total revenue.
PED > 1：有弹性 – 需求量变动的比例大于价格变动的比例。企业可以通过降价来增加总收益。
PED < 1: Inelastic – quantity demanded changes proportionally less than price. Raising price increases total revenue.
PED < 1：缺乏弹性 – 需求量变动比例小于价格变动比例。提高价格可增加总收益。
PED = 1: Unitary elastic – total revenue remains unchanged when price changes.
PED = 1：单位弹性 – 价格变动时总收益不变。
Key determinants of PED: availability of close substitutes, degree of necessity, proportion of income spent, and time period.
影响PED的主要因素：相近替代品的可得性、必需程度、占收入的比例以及时间跨度。
Price elasticity of supply (PES) measures how responsive quantity supplied is to a price change.
供给价格弹性（PES）衡量供给量对价格变动的反应程度。
PES = (%ΔQs) / (%ΔP)
PES is influenced by the mobility of factors, spare production capacity, the ability to store stock, and the time period. Supply is typically more elastic in the long run.
PES受要素流动性、闲置产能、库存能力以及时间跨度的影响。供给在长期通常更富有弹性。
8. 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.
市场失灵发生在自由市场未能有效配置资源，导致社会净福利损失之时。
Negative externalities: costs imposed on third parties not involved in the consumption or production, e.g. pollution from factories. The social cost exceeds the private cost.
负外部性：对未参与消费或生产的第三方施加的成本，如工厂污染。社会成本超过私人成本。
Positive externalities: benefits to third parties, e.g. vaccination reduces the spread of disease. The social benefit exceeds the private benefit.
正外部性：给第三方带来的收益，如疫苗接种减少疾病传播。社会收益超过私人收益。
Public goods are non‑rival and non‑excludable (e.g. street lighting). Private firms have little incentive to provide them, leading to under‑provision.
公共物品具有非竞争性和非排他性（例如路灯）。私营企业缺乏供给激励，导致供应不足。
Information asymmetry: when one party has more or better information than the other, leading to adverse outcomes, such as in second‑hand car markets.
信息不对称：一方比另一方拥有更多或更优信息，导致不良后果，如二手车市场。
Monopoly power can also cause market failure by restricting output and raising prices above competitive levels.
垄断势力也可能通过限制产量并将价格抬高至竞争水平之上而导致市场失灵。
9. Government Intervention | 政府干预
Governments intervene to correct market failures and improve allocative efficiency. Common methods include:
政府通过干预来纠正市场失灵并改善配置效率。常见方法包括：
Indirect taxation: A tax on demerit goods (e.g. cigarettes) raises private costs, internalising the externality and reducing consumption.
间接税：对有害商品（如香烟）征税会提高私人成本，内化外部性并减少消费。
Subsidies: Payments to producers of merit goods (e.g. renewable energy) lower costs and encourage higher output and consumption.
补贴：对优效品（如可再生能源）生产者给予补贴可降低成本，鼓励增加产量和消费。
Maximum price (price ceiling): A legal maximum set below equilibrium, used to make necessities affordable (e.g. rent controls). It can create shortages.
最高限价：设定于均衡价格之下的法定最高价，用于使必需品负担得起（如租金管控），但可能造成短缺。
Minimum price (price floor): A legal minimum set above equilibrium, used to protect producers' incomes (e.g. minimum wage). It can generate surpluses.
最低限价
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