📚 Year 12 Edexcel Economics: Key Terms Memorisation Guide | Year 12 Edexcel 经济：词汇术语速记指南
Mastering economics vocabulary is the first step to achieving a top grade in Edexcel Year 12. This guide provides clear definitions, memory aids and contextual examples for every essential term you need to know. By associating each concept with a simple phrase, acronym or visual cue, you will be able to recall them quickly in exams and use them accurately in essays and data-response questions.
掌握经济学词汇是在 Edexcel Year 12 取得高分的首要步骤。本指南为你提供每个必学术语的清晰定义、记忆技巧和情境实例。通过将每个概念与简单的短语、缩写或视觉线索联系起来，你将能够在考试中迅速回忆并在论文和数据分析题中准确使用它们。
1. Scarcity, Choice and Opportunity Cost | 稀缺性、选择与机会成本
Scarcity is the fundamental economic problem: finite resources cannot satisfy infinite human wants. Remember it as ‘scarce city’ — every city faces shortages, just like economies. Because of scarcity, individuals, firms and governments must make choices about how to allocate resources.
稀缺性是基本的经济问题：有限的资源无法满足无限的人类欲望。记忆方法：‘scarce city’（紧缺之城）——每个城市都面临短缺，就像经济体一样。由于稀缺性的存在，个人、企业和政府必须就如何分配资源做出选择。
Opportunity cost is the value of the next best alternative you give up when making a choice. Think of it as ‘Oh, choose!’ — every choice has a hidden price: the best thing you did not pick. For example, a government that spends £100 million on a new motorway might forgo building two hospitals; the opportunity cost is the lost hospitals.
机会成本是你做出选择时所放弃的次优选项的价值。记忆窍门：‘Oh, choose!’——每个选择都隐藏着一个代价：你放弃的最佳替代。例如，政府花费 1 亿英镑修建一条新高速公路，可能就放弃了建两座医院的机会；机会成本就是那两座被放弃的医院。
2. Factors of Production | 生产要素
Economists classify resources into four factors of production. Use the word CELL to remember them: Capital, Enterprise, Land, Labour. Capital includes machinery, vehicles and factories. Enterprise is the risk‑taking ability of entrepreneurs, who combine the other three factors. Land covers all natural resources (oil, water, forests). Labour is the human workforce.
经济学家将资源分为四种生产要素。用 CELL 这个词来记忆：Capital（资本）、Enterprise（企业家精神）、Land（土地）、Labour（劳动）。资本包括机器、车辆和厂房。企业家精神是企业家承担风险、组合其他三种要素的能力。土地涵盖所有自然资源（石油、水、森林）。劳动是人力。
Think of a pizza business: land = the wheat and tomatoes; labour = the chef; capital = the oven; enterprise = the owner who created the recipe and took the financial risk. The reward for each factor is rent (land), wages (labour), interest (capital) and profit (enterprise).
设想一家披萨店：土地 = 小麦和番茄；劳动 = 厨师；资本 = 烤炉；企业家精神 = 创造配方并承担财务风险的老板。各要素的报酬分别是地租、工资、利息和利润。
3. Production Possibility Frontier (PPF) | 生产可能性边界（PPF）
The PPF shows the maximum possible output combinations of two goods an economy can produce with its existing resources and technology. A point on the curve represents full employment of resources; inside the curve is unemployment; outside is currently unattainable. A key diagram for your Edexcel exam.
PPF 显示一个经济体在现有资源和技术下能够生产的两种商品的最大可能产量组合。曲线上的点代表资源被充分利用；曲线内部代表失业；曲线外部则是当前无法达到的。这是 Edexcel 考试中的关键图表。
Why is the PPF usually bowed outwards? Because of increasing opportunity cost. As you produce more of one good, you must give up increasing amounts of the other. To remember the shape, think of a ‘bowed bow’ that curves away from the origin. An outward shift of the PPF indicates economic growth, caused by more resources or better technology.
为什么 PPF 通常是向外弯曲的？因为机会成本递增。当你生产更多的一种商品时，必须放弃越来越多的另一种商品。为了记住形状，可以想象一把向外弯曲的弓。PPF 向外移动代表经济增长，由资源增加或技术进步引起。
4. Demand, Supply and Market Equilibrium | 需求、供给与市场均衡
The law of demand states that as price rises, quantity demanded falls (ceteris paribus). The demand curve slopes downwards. The law of supply says that as price rises, quantity supplied rises. The supply curve slopes upwards. Market equilibrium occurs where quantity demanded equals quantity supplied.
需求定律指出，在其他条件不变时，价格上升，需求量下降。需求曲线向右下方倾斜。供给定律指出，价格上升，供给量上升。供给曲线向右上方倾斜。市场均衡发生在需求量等于供给量之时。
To identify what shifts demand, use the acronym PASIFIC: Population, Advertising, Substitutes (price of), Income (normal/inferior goods), Fashion/tastes, Interest rates (for durable goods), Complements (price of). A change in any of these shifts the entire demand curve, whereas a change in price only causes a movement along the curve.
为了区分哪些因素导致需求移动，可以使用缩略词 PASIFIC：Population（人口）、Advertising（广告）、Substitutes（替代品价格）、Income（收入，区分正常品和低档品）、Fashion/tastes（时尚/偏好）、Interest rates（利率，对耐用品）、Complements（互补品价格）。这些因素中任何一个变化都会导致整条需求曲线移动，而价格变动仅引起沿曲线的移动。
Shifters of supply can be remembered with PINTS WC: Productivity, Indirect taxes, Number of firms, Technology, Subsidies, Weather (for agricultural goods), Costs of production. A fall in the cost of raw materials shifts the supply curve to the right (increase in supply).
供给的移动因素可以用 PINTS WC 来记忆：Productivity（生产力）、Indirect taxes（间接税）、Number of firms（企业数量）、Technology（技术）、Subsidies（补贴）、Weather（天气）、Costs of production（生产成本）。原材料成本下降会使供给曲线向右移动（供给增加）。
5. Price Elasticity of Demand (PED) and Supply (PES) | 需求价格弹性（PED）与供给价格弹性（PES）
PED measures how responsive quantity demanded is to a change in price. It is calculated as % change in quantity demanded divided by % change in price. The absolute value tells us the elasticity: if >1, demand is elastic; if <1, inelastic; if =1, unitary elastic. Perfectly elastic demand is horizontal; perfectly inelastic is vertical.
PED 衡量需求量对价格变动的反应程度。计算公式是需求量变动百分比除以价格变动百分比。绝对值告诉我们弹性类型：大于 1 为富有弹性；小于 1 为缺乏弹性；等于 1 为单位弹性。完全弹性需求是水平线；完全无弹性需求是垂直线。
Determinants of PED can be memorised with SPLAT: Substitutes (number/ closeness), Proportion of income spent on the good, Luxury or necessity, Addiction (habitual consumption), Time period (longer → more elastic). Goods like cigarettes have inelastic demand, so a tax rise raises revenue for the government.
PED 的决定因素可以用 SPLAT 来记忆：Substitutes（替代品的数量和相似度）、Proportion of income（占收入的比例）、Luxury or necessity（奢侈品抑或必需品）、Addiction（上瘾性消费）、Time period（时间越长弹性越大）。香烟等商品缺乏弹性，因此增税能增加政府收入。
PES measures responsiveness of quantity supplied to a price change. Determinants include length of production period, availability of spare capacity, ease of storing stock, and complexity of the production process. Agricultural goods often have low PES in the short run because crops take time to grow.
PES 衡量供给量对价格变动的反应程度。决定因素包括生产周期的长短、是否存在闲置产能、库存的便利性和生产过程的复杂程度。农产品在短期通常 PES 较小，因为作物需要时间生长。
6. Income Elasticity of Demand (YED) and Cross Elasticity of Demand (XED) | 需求收入弹性（YED）与需求交叉弹性（XED）
YED measures how demand changes as consumer income changes. For normal goods, YED is positive — as income rises, demand rises. Inferior goods have a negative YED (e.g., supermarket own‑label products fall when incomes increase). Luxury goods typically have YED > 1.
YED 衡量需求随消费者收入变化而变化的程度。对于正常品，YED 为正——收入上升，需求上升。低档品有负的 YED（例如超市自有品牌产品，当收入增加时需求下降）。奢侈品通常 YED 大于 1。
XED measures how the demand for good A responds to a price change in good B. If XED is positive, the goods are substitutes (e.g., Coke and Pepsi). If XED is negative, they are complements (e.g., printers and ink cartridges). A zero XED means the goods are unrelated.
XED 衡量 A 商品的需求对 B 商品价格变动的反应程度。如果 XED 为正，两种商品是替代品（如可口可乐和百事可乐）。如果 XED 为负，它们是互补品（如打印机和墨盒）。XED 为零则表示商品之间无关。
7. Market Failure and Externalities | 市场失灵与外部性
Market failure occurs when the free market, left to itself, does not allocate resources efficiently. One major cause is externalities — costs or benefits that spill over onto third parties. A negative production externality (e.g., factory pollution) means the social cost exceeds the private cost, leading to over‑production. A positive consumption externality (e.g., vaccinations) means social benefit exceeds private benefit, leading to under‑consumption.
市场失灵是指自由市场在不受干预时未能有效配置资源。一个主要原因是外部性——影响到第三方的成本或收益。负生产外部性（如工厂污染）意味着社会成本大于私人成本，导致生产过剩。正消费外部性（如疫苗接种）意味着社会收益大于私人收益，导致消费不足。
To draw the appropriate diagram, remember that the social optimum is where MSC = MSB. For negative externalities, the free market produces where MPB = MPC, which is to the right of the social optimum. The welfare loss is the triangle between MSC and MSB from the private optimum to the social optimum. Use the phrase ‘socially optimum where SC = SB’ to recall the condition.
画图时记住，社会最优点在 MSC = MSB 处。对于负外部性，自由市场会在 MPB = MPC 处生产，这一点位于社会最优点的右侧。福利损失是私人最优产出到社会最优产出之间 MSC 与 MSB 之间的三角形区域。用“社会最优在 SC = SB”这句话来记忆均衡条件。
8. Public Goods and Information Gaps | 公共物品与信息不对称
Public goods have two characteristics: non‑rivalry (one person’s consumption does not reduce availability to others) and non‑excludability (you cannot stop free‑riders from using them). Street lighting and national defence are classic examples. The free‑rider problem means private firms will not supply them, so governments must step in.
公共物品有两个特征：非竞争性（一人的消费不减少他人可用的数量）和非排他性（无法阻止搭便车者使用）。路灯和国防是典型例子。搭便车问题意味着私人企业不会提供这些物品，因此政府必须介入。
Information gaps happen when buyers or sellers lack full information, leading to misallocation. Asymmetric information can cause adverse selection (e.g., only high‑risk drivers buy expensive car insurance) and moral hazard (people take more risks because they are protected, e.g., having insurance). In markets for merit goods like education, under‑consumption may occur because individuals do not appreciate the full private benefits.
信息不对称发生在买方或卖方缺乏完全信息时，导致资源错配。信息不对称可能引起逆向选择（例如只有高风险司机购买昂贵的车险）和道德风险（人们因受到保护而冒更大风险，如买了保险后更冒险）。在优效品市场如教育，消费不足可能是因为个人未意识到全部私人收益。
9. Government Intervention Methods | 政府干预措施
To correct negative externalities, governments often use indirect taxes. A Pigouvian tax set equal to the external cost forces producers to internalise the externality, shifting the supply curve leftwards. For positive externalities, subsidies shift the supply or demand curve in the opposite direction, encouraging consumption. Maximum and minimum prices (price floors and ceilings) are used to control essential goods or guarantee incomes.
为了纠正负外部性，政府通常使用间接税。将庇古税设定为等于外部成本，迫使生产者将外部性内部化，从而使供给曲线左移。对于正外部性，补贴会使供给或需求曲线反向移动，鼓励消费。最高和最低限价（价格上限和下限）被用来控制必需品价格或保证收入。
Other tools include tradable pollution permits (cap‑and‑trade), which incentivise firms to reduce emissions; regulation (bans, standards); and state provision of public or merit goods. The key is to match the intervention to the source of market failure. Remember: ‘Tax the bad, subsidise the good, regulate the ugly.’
其他工具包括可交易的排污许可证（总量控制与交易），激励企业减少排放；监管（禁令、标准）；以及政府直接提供公共物品或优效品。关键是要让干预措施与市场失灵的根源相匹配。记住：‘征税于坏，补贴于好，监管于恶。’
10. Macroeconomic Objectives and Indicators | 宏观经济目标与指标
Governments generally pursue four main macroeconomic objectives: low and stable inflation (the UK target is 2% CPI), high and sustainable economic growth (measured by real GDP), low unemployment, and a satisfactory balance of payments on the current account. Additional objectives can include a balanced government budget, reduced income inequality and environmental protection.
政府通常追求四个主要的宏观经济目标：低而稳定的通胀（英国目标是 CPI 2%）、高且可持续的经济增长（以实际 GDP 衡量）、低失业率以及令人满意的国际收支经常项目平衡。额外的目标可能包括政府预算平衡、减小收入不平等和环境保护。
Key indicators: CPI (Consumer Price Index) tracks the price of a basket of goods. GDP (Gross Domestic Product) is the total value of output produced within a country. The unemployment rate is typically measured by the Labour Force Survey (LFS). The current account records trade in goods, services, primary and secondary income. A helpful mnemonic is ‘TIGER’ — Trade, Inflation, Growth, Employment, Redistribution of income.
关键指标：CPI（消费者物价指数）追踪一篮子商品的价格。GDP（国内生产总值）是一国境内生产的总产出价值。失业率通常通过劳动力调查（LFS）测算。经常项目记录货物、服务、初次收入和二次收入。一个有用的记忆法是 ‘TIGER’——贸易（Trade）、通胀（Inflation）、增长（Growth）、就业（Employment）和收入再分配（Redistribution）。
11. Aggregate Demand (AD) and Aggregate Supply (AS) | 总需求（AD）与总供给（AS）
Aggregate Demand is the total spending on goods and services in an economy at a given price level. AD = C + I + G + (X − M): Consumption, Investment, Government spending, and net exports. The AD curve slopes downward because of the wealth effect, interest rate effect and international trade effect. Any component increasing shifts AD right.
总需求是在给定的物价水平下经济中对商品和服务的总支出。AD = C + I + G + (X − M)：消费、投资、政府支出和净出口。AD 曲线向右下方倾斜，原因包括财富效应、利率效应和国际贸易效应。任何一个组成部分的增加都会使 AD 曲线右移。
Short‑run Aggregate Supply (SRAS) is the amount firms are willing to supply at each price level. It shifts mainly because of changes in costs of production (wages, raw materials, indirect taxes, exchange rates affecting imported inputs). Long‑run Aggregate Supply (LRAS) represents the productive capacity of the economy. The classical LRAS is vertical at full employment; the Keynesian LRAS has a horizontal section where spare capacity exists.
短期总供给（SRAS）是在每个物价水平下企业愿意提供的产量。它主要因生产成本变动（工资、原材料、间接税、影响进口投入的汇率）而移动。长期总供给（LRAS）代表经济的生产能力。古典学派的 LRAS 在充分就业处垂直；凯恩斯学派的 LRAS 存在闲置产能的水平段。
12. The Multiplier Effect and Economic Cycle | 乘数效应与经济周期
The multiplier effect occurs when an initial injection into the circular flow (e.g., a rise in government spending) leads to a larger final increase in real national income. The size of the multiplier depends on the marginal propensity to consume (MPC) and the marginal propensity to withdraw (MPW = saving + tax + imports). Multiplier k = 1 / (1 − MPC) or 1 / MPW. A high MPC means a larger multiplier.
乘数效应是指对循环流转的一次初始注入（如政府支出增加）导致实际国民收入出现更大的最终增加。乘数的大小取决于边际消费倾向（MPC）和边际漏出倾向（MPW = 储蓄 + 税收 + 进口）。乘数 k = 1 / (1 − MPC) 或 1 / MPW。MPC 越高，乘数越大。
The economic cycle describes fluctuations in actual GDP around the trend growth path. The four stages are boom (above trend growth), downturn (slowing), recession/trough (two consecutive quarters of negative growth is a technical recession), and recovery. The output gap is the difference between actual GDP and full‑capacity GDP; a negative output gap indicates idle resources and upward pressure on unemployment.
经济周期描述了实际 GDP 围绕趋势增长路径的波动。四个阶段分别是繁荣（高于趋势增长）、下行（减速）、衰退/谷底（连续两个季度负增长为技术性衰退）和复苏。产出缺口是实际 GDP 与满负荷产能 GDP 之间的差；负产出缺口意味着存在闲置资源，失业率面临上升压力。
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