📚 Year 12 AQA Economics: Key Terminology Fast-Track Guide | 英国AQA Year 12经济：核心术语速记指南
Mastering AQA Year 12 Economics starts with a rock-solid understanding of its core terminology. This guide breaks down the essential terms into logical groups and pairs each definition with memory-friendly explanations, helping you move from passive reading to active recall. Whether you are tackling microeconomic market analysis or macroeconomic policy, having these definitions at your fingertips will strengthen your essays, multiple-choice decisions and data-response answers.
掌握AQA Year 12经济学知识，首先要扎实理解核心术语。本指南将关键术语分门别类，为每个定义配搭易于记忆的中文解释，帮助你把被动阅读转化为主动回顾。无论是分析微观经济市场还是考察宏观经济政策，熟记这些定义都能让你的论文、选择题和数据应答更有底气。
1. Scarcity, Choice and Opportunity Cost | 稀缺、选择与机会成本
Every economic decision stems from the basic economic problem: infinite wants versus finite resources. This section's terms form the foundation on which the rest of the AQA course is built.
每一个经济决策都根源于基本的经济问题：无限欲望对战有限资源。本节的术语是整个AQA课程建构的基石。
Scarcity: The situation where limited resources cannot meet all human wants, forcing choices to be made about how they are allocated.
稀缺：有限资源无法满足所有人类欲望的情形，这迫使人们就资源配置作出选择。
Opportunity Cost: The next best alternative forgone when an economic decision is made; the true cost of any choice is what you give up to obtain it.
机会成本：作出某种经济决策时所放弃的下一个最佳选择；任何选择的真正代价，就是你为了获得它而放弃的东西。
Factors of Production: The resources used to produce goods and services: land, labour, capital and enterprise. A simple memory shortcut is CELL – Capital, Enterprise, Land, Labour.
生产要素：用于生产商品和服务的资源，包括土地、劳动力、资本和企业家才能。一个简单的记忆口诀是CELL：资本(Capital)、企业家才能(Enterprise)、土地(Land)、劳动力(Labour)。
Production Possibility Frontier (PPF): A curve showing the maximum possible output combinations of two goods or services an economy can achieve when all resources are fully and efficiently employed. Points inside the PPF indicate underemployment or inefficiency; shifting the frontier outward signals economic growth through more resources or better technology.
生产可能性边界 (PPF)：一条曲线，显示在所有资源被充分且有效率地使用时一个经济体所能达到的两种商品或服务的最大产出组合。曲线内的点表示资源闲置或低效；PPF向外移动意味着通过更多资源或技术进步实现了经济增长。
2. Demand and Supply | 需求与供给
The market mechanism is driven by buyers and sellers. Getting the terminology of demand and supply flawless is essential for analysing price determination and market outcomes.
市场机制由买方和卖方驱动。精准掌握需求与供给的术语对分析价格决定和市场结果至关重要。
Law of Demand: As the price of a good falls, the quantity demanded increases, ceteris paribus (all other factors held constant).
需求定律：在其他条件不变的前提下，商品价格下跌，需求量增加。
Law of Supply: As the price of a good rises, the quantity supplied increases, ceteris paribus, because higher prices create incentive and cover higher marginal costs.
供给定律：在其他条件不变的前提下，商品价格上升，供给量增加，因为更高的价格提供了激励并覆盖较高的边际成本。
Key Demand Shift Factors (use PIRATES): Population, Income, Related goods (substitutes and complements), Advertising, Tastes, Expectations, Seasons. If any of these change, the whole demand curve shifts left or right.
关键需求移动因素（用PIRATES记忆）：人口(Population)、收入(Income)、相关商品(Related goods，即替代品与互补品)、广告(Advertising)、品味(Tastes)、预期(Expectations)、季节(Seasons)。其中任何一项变化，整条需求曲线就会向左或向右移动。
Key Supply Shift Factors (use PINTS WC): Productivity, Indirect taxes, Number of firms, Technology, Subsidies, Weather, Costs of production. These alter the willingness and ability of producers to supply at every price.
关键供给移动因素（用PINTS WC记忆）：生产率(Productivity)、间接税(Indirect taxes)、企业数量(Number of firms)、技术(Technology)、补贴(Subsidies)、天气(Weather)、生产成本(Costs of production)。这些因素会改变生产者在每个价格水平上供应的意愿和能力。
Substitute Goods: Products that can replace each other in consumption; a rise in the price of one leads to an increase in demand for the other (e.g. tea and coffee).
替代品：能在消费中相互取代的产品；一种商品价格上涨会导致对另一种商品的需求增加（例如茶和咖啡）。
Complementary Goods: Products consumed together; an increase in the price of one reduces demand for the other (e.g. printers and ink cartridges).
互补品：一起消费的产品；一种商品价格上涨会减少对另一种商品的需求（例如打印机和墨盒）。
3. Price Elasticity and Its Applications | 价格弹性及其应用
Elasticities measure responsiveness. AQA requires precise definitions, formulae and, most importantly, the ability to interpret the numbers for decision-making.
弹性用来衡量反应程度。AQA要求精确的定义、公式，而更重要的是能够为决策解读数据。
Price Elasticity of Demand (PED): e quantity demanded of a good changes in response to a change in its price. Formula: PED = %ΔQd / %ΔP.
需求的价格弹性 (PED)：衡量一种商品的需求量对其价格变化的反应程度。公式：PED = %ΔQd / %ΔP。
Elastic Demand: PED > 1. A percentage change in price causes a larger percentage change in quantity demanded. Firms typically lower prices to raise total revenue.
富有弹性需求：PED > 1。价格的百分比变化引起需求量更大的百分比变化。企业通常会降价以提高总收入。
Inelastic Demand: PED < 1. Quantity demanded is relatively unresponsive to price changes. Firms can raise price to increase total revenue.
缺乏弹性需求：PED < 1。需求量对价格变化相对不敏感。企业可以提高价格来增加总收入。
Unit Elastic Demand: PED = 1. Revenue stays constant when price changes.
单位弹性需求：PED = 1。价格变化时，总收入保持不变。
Income Elasticity of Demand (YED): YED = %ΔQd / % rmal goods have positive YED; luxury goods have YED > 1; inferior goods have negative YED.
需求的收入弹性 (YED)：YED = %ΔQd / %ΔY。正常商品具有正的YED；奢侈品YED > 1；劣等商品YED为负。
Cross Elasticity of Demand (XED): XED = %ΔQd of good A / %ΔP of good B. Substitutes yield positive XED; complements yield negative XED.
需求的交叉弹性 (XED)：XED = 商品A的需求量百分比变化 / 商品B的价格百分比变化。替代品的XED为正；互补品的XED为负。
Price Elasticity of Supply (PES): PES = %ΔQs / %ΔP. It depends largely on time horizons, spare capacity and storability of the product.
供给的价格弹性 (PES)：PES = %ΔQs / %ΔP。它很大程度上取决于时间跨度、闲置产能和产品的可储存性。
4. Market Efficiency and Welfare | 市场效率与福利
Free markets can deliver outstanding outcomes when conditions are right. The following terms help you judge whether markets are working in society's best interests.
状况恰当时，自由市场可以实现出色的结果。下列术语帮助判断市场运行是否符合社会最佳利益。
Consumer Surplus: The difference between the maximum price consumers are willing to pay and the market price they actually pay. It represents the extra benefit consumers receive.
消费者剩余：消费者愿意支付的最高价格与他们实际支付的市场价格之间的差额，代表了消费者获得的额外利益。
Producer Surplus: The difference between the minimum price at which producers are willing to sell and the market price they actually receive.
生产者剩余：生产者愿意出售的最低价格与他们实际获得的市场价格之间的差额。
Allocative Efficiency: social welfare is maximised because the last unit consumed is valued exactly at its cost.
分配效率：当资源追随消费者偏好而实现，价格等于边际成本 (P = MC)。此时，社会福利最大化，因为消费的最后一单位其价值正好等于其成本。
Productive Efficiency: Firms produce at the lowest point on the average cost curve (AC minimum), using the least-cost combination of inputs. It means no waste in production.
生产效率：企业在平均成本曲线的最低点生产（AC最小），使用成本最低的要素组合，表示生产中不存在浪费。
Dynamic Efficiency: Efficiency achieved over time through innovation, investment and technological progress. Supernormal profit often provides the incentive for this.
动态效率：通过创新、投资和技术进步，随时间推移而实现的效率。超额利润往往是实现这种效率的动力。
5. Market Failure and Externalities | 市场失灵与外部性
Market failure occurs when the free market, left alone, fails to allocate resources efficiently. Externalities, public goods and information gaps are the most common culprits in AQA exam questions.
当自由市场任其自然无法有效配置资源时，便出现市场失灵。外部性、公共物品和信息缺口是AQA考题中最常见的罪魁祸首。
Negative Externality: A cost imposed on a third party not directly involved in the economic transaction. For example, factory emissions harming nearby residents. The social cost exceeds the private cost, leading to overproduction.
负外部性：强加给未直接参与经济交易的第三方的成本，例如工厂排放物损害附近居民。社会成本大于私人成本，导致过度生产。
Positive Externality: A benefit enjoyed by a third party. Vaccinations protect not only the individual but also the community. Social benefit exceeds private benefit, causing underproduction.
正外部性：第三方享受到的好处。疫苗接种不仅保护个人，也保护社区。社会收益大于私人收益，导致生产不足。
Public Goods: Goods that are non-excludable and non-rivalrous. Non-excludable means you cannot prevent anyone from consuming them; non-rival means one person's consumption does not reduce availability for others (e.g. street lighting). The free-rider problem means markets will under-provide them.
公共物品：具有非排他性和非竞争性的商品。非排他性指无法阻止任何人消费；非竞争性指一个人的消费不会减少其他人的可获得量（如路灯）。搭便车问题意味着市场提供不足。
Information Asymmetry: When one party in a transaction has more or better information than the other, leading to adverse selection or moral hazard. Sellers of second-hand cars often know more than buyers,
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