📚 AQA Year 12 Economics: A Fast-Track Guide to Key Terminology | AQA 经济学：关键术语速记指南
Mastering essential economic terminology is the first step to excelling in AQA Year 12 Economics. This fast-track guide organises key terms into logical clusters and supplies powerful memory hooks - acronyms, associations, and contrast pairs - so you can recall definitions and apply them confidently under exam pressure. Each term is presented as an English-Chinese pair with a mnemonic tip that sticks.
掌握核心经济术语是 AQA 经济学高分的基石。本速记指南将关键术语按逻辑分组，并配以高效的记忆钩子——首字母缩写、联想对比——让你在考试中轻松回忆并准确应用。每个术语均以英中对照呈现，并附有记忆窍门。
1. The Economic Problem: Scarcity, Choice and the S-C-C Rule | 经济问题：稀缺性、选择与 S-C-C 法则
Scarcity is the fundamental economic problem: unlimited wants but limited resources. Remember it as a universal 'scar' on all resources - there is never enough to satisfy everyone completely.
稀缺性是根本经济问题：无限的欲望与有限的资源之间的矛盾。将它想象成所有资源上的一道'伤疤'（scar）——永远不可能完全满足所有人的需求。
Choice arises directly from scarcity; every decision involves forgoing alternatives. Use the mnemonic 'S-C-C': Scarcity Creates Choices.
选择直接源于稀缺性；每个决策都意味着放弃其他选项。记住'S-C-C'：稀缺性造成选择。
Opportunity cost is the value of the next best alternative forgone when a choice is made. It is not simply money; it includes time, resources and satisfaction given up.
机会成本是做出选择时所放弃的次优选项的价值。它不仅是金钱，还包括放弃的时间、资源与满足感。
Economic agents - consumers, firms and governments - all face scarcity and must make choices. Their decisions create the central economic questions: what to produce, how to produce, and for whom to produce.
经济主体——消费者、企业与政府——都面临稀缺性并必须做出选择。他们的决策形成核心经济问题：生产什么、如何生产、为谁生产。
2. Opportunity Cost, PPF and the TANSTAAFL Hook | 机会成本、生产可能性边界与 TANSTAAFL 记忆法
A production possibility frontier (PPF) shows the maximum combinations of two goods an economy can produce with all resources fully and efficiently employed. Points on the curve indicate productive efficiency; points inside indicate unemployment or inefficiency.
生产可能性边界（PPF）表示一个经济体在资源被充分有效利用时，两种产品的最大组合。曲线上的点代表生产效率；曲线内的点代表失业或低效率。
Remember 'TANSTAAFL': There Ain't No Such Thing As A Free Lunch. Every point on the PPF involves a trade-off, so moving along the curve illustrates opportunity cost.
记住'TANSTAAFL'：天下没有免费的午餐。PPF 上的每个点都涉及权衡取舍，因此沿曲线移动就体现了机会成本。
Productive efficiency means producing at the lowest possible average cost. Allocative efficiency occurs where resources are allocated to produce the combination most desired by society, often shown where marginal social benefit equals marginal social cost.
生产效率指以尽可能低的平均成本进行生产。配置效率指资源被分配去生产社会最渴望的产品组合，通常表现为边际社会收益等于边际社会成本。
Economic growth shifts the PPF outward through more or better resources, or improved technology. A movement along the curve is not growth; it is a reallocation of existing resources.
经济增长通过更多或更优质的资源，或技术进步，使 PPF 向外移动。沿曲线移动不是增长，而是现有资源的重新配置。
3. Demand, Supply and Market Equilibrium | 需求、供给与市场均衡
Demand is the quantity of a good consumers are willing and able to buy at each price, ceteris paribus. The law of demand states that price and quantity demanded are inversely related.
需求是在其他条件不变时，消费者在每个价格水平上愿意且能够购买的商品数量。需求定律指出价格与需求量呈反向关系。
Supply is the quantity producers are willing and able to sell at each price, ceteris paribus. The law of supply states that price and quantity supplied are directly related.
供给是在其他条件不变时，生产者在每个价格水平上愿意且能够出售的商品数量。供给定律指出价格与供给量呈正向关系。
Equilibrium occurs where demand equals supply. At this price there is no shortage or surplus, so the market clears.
均衡发生在需求等于供给之处。在该价格下既无短缺也无过剩，市场出清。
Excess demand occurs when price is below equilibrium, causing shortages and upward pressure on price. Excess supply occurs when price is above equilibrium, causing surpluses and downward pressure on price.
超额需求发生在价格低于均衡价格时，导致短缺并产生价格上涨压力。超额供给发生在价格高于均衡价格时，导致过剩并产生价格下跌压力。
Always distinguish a movement along a curve, caused by a price change, from a shift of a curve, caused by a non-price determinant such as income, tastes, technology, input costs or government policy.
务必区分由价格变化引起的沿曲线移动，与由收入、偏好、技术、投入成本或政府政策等非价格因素引起的曲线移动。
4. Elasticity: PED, PES, YED and XED | 弹性：需求价格弹性、供给价格弹性、收入弹性与交叉弹性
Price elasticity of demand (PED) measures responsiveness of quantity demanded to a price change. In AQA exams you usually ignore the negative sign and compare the absolute value.
需求价格弹性（PED）衡量需求量对价格变化的反应程度。在 AQA 考试中通常忽略负号，比较绝对值。
PED = %ΔQd ÷ %ΔP
Memory hook: 'PED is a price sensitivity score.' demand is elastic; if PED < 1, demand is inelastic; if PED = 1, demand is unit elastic.
记忆钩子：'PED 是价格敏感度分数。' 若 PED > 1，需求富有弹性；若 PED < 1，需求缺乏弹性；若 PED = 1，需求为单位弹性。
Price elasticity of supply (PES) measures responsiveness of quantity supplied to a price change. Supply is more elastic when firms have spare capacity and time to adjust.
供给价格弹性（PES）衡量供给量对价格变化的反应程度。当企业有闲置产能且有调整时间时，供给更富弹性。
Income elasticity of demand (YED) measures responsiveness of demand to income changes. Positive YED indicates a normal good; negative YED indicates an inferior good.
需求收入弹性（YED）衡量需求对收入变化的反应程度。YED 为正表示正常品；YED 为负表示低档品。
Cross elasticity of demand (XED) measures responsiveness of demand for good A to a price change of good B. Positive XED indicates substitutes; negative XED indicates complements.
需求交叉弹性（XED）衡量商品 A 的需求对商品 B 价格变化的反应程度。XED 为正表示替代品；XED 为负表示互补品。
| Elasticity | Positive means | Negative means |
| YED | Normal good | Inferior good |
| XED | Substitutes | Complements |
5. Consumer Surplus, Producer Surplus and Allocative Efficiency | 消费者剩余、生产者剩余与配置效率
Consumer surplus is the difference between what consumers are willing to pay and what they actually pay. On a diagram it is the area below the demand curve and above the equilibrium price.
消费者剩余是消费者愿意支付的价格与实际支付价格之间的差额。在图上表现为需求曲线以下、均衡价格以上的面积。
Producer surplus is the difference between the price producers receive and the minimum price they would accept. It is the area above the supply curve and below the equilibrium price.
生产者剩余是生产者实际得到的价格与其愿意接受的最低价格之间的差额。它是供给曲线以上、均衡价格以下的面积。
Total surplus is consumer surplus plus producer surplus. It is maximised at the competitive equilibrium, which is why economists often call this outcome allocatively efficient.
总剩余等于消费者剩余加生产者剩余。它在竞争性均衡处达到最大，因此经济学家常称这一结果具有配置效率。
Deadweight loss is the loss of total surplus caused by market failure or government intervention that moves the market away from equilibrium. It is the 'welfare triangle' on a diagram.
无谓损失是由市场失灵或政府干预使市场偏离均衡而造成的总剩余损失。它是图上的'福利三角形'。
6. Costs, Revenue and Profit | 成本、收益与利润
Fixed costs do not vary with output in the short run, such as rent. Variable costs change directly with output, such as raw materials. Total cost is fixed cost plus variable cost.
固定成本在短期内不随产量变化，如租金。可变成本随产量直接变化，如原材料。总成本等于固定成本加可变成本。
Marginal cost is the addition to total cost from producing one more unit. Average cost is total cost divided by output.
边际成本是多生产一单位产品所增加的总成本。平均成本是总成本除以产量。
Total revenue equals price times quantity. Marginal revenue is the addition to total revenue from selling one more unit. Profit is total revenue minus total cost.
总收益等于价格乘以数量。边际收益是多销售一单位产品所增加的总收益。利润是总收益减去总成本。
Firms are assumed to profit-maximise where marginal revenue equals marginal cost: MR = MC. This is the golden rule of microeconomics.
假设企业追求利润最大化，条件是边际收益等于边际成本：MR = MC。这是微观经济学的黄金法则。
7. Market Failure: Externalities and Public Goods | 市场失灵：外部性与公共物品
Market failure occurs when the free market fails to allocate resources efficiently, causing a loss of social welfare. Common causes include externalities, public goods, information failure and market power.
市场失灵发生在自由市场未能有效配置资源、造成社会福利损失之时。常见原因包括外部性、公共物品、信息失灵与市场势力。
An externality is a third-party effect of production or consumption not reflected in market prices. Negative externalities create external costs; positive externalities create external benefits.
外部性是生产或消费对第三方产生、且未反映在市场价格中的影响。负外部性产生外部成本；正外部性产生外部收益。
MSC = MPC + External Cost
MSB = MPB + External Benefit
Public goods are non-rival and non-excludable. Non-rival means one person's consumption does not reduce availability to others; non-excludable means people cannot be prevented from consuming them. The free-rider problem causes under-provision.
公共物品具有非竞争性与非排他性。非竞争性指一个人消费不会减少他人可获得的数量；非排他性指无法阻止人们消费。搭便车问题导致供给不足。
Merit goods are under-consumed because of information failure, while demerit goods are over-consumed. In both cases, consumers may underestimate or overestimate private benefits and costs.
有益品因信息失灵而消费不足，有害品则消费过度。两种情况下，消费者都可能低估或高估私人收益与私人成本。
8. Government Intervention and Government Failure | 政府干预与政府失灵
Indirect taxes raise the cost of production or consumption, aiming to internalise external costs. A specific tax shifts the supply curve upward by the amount of the tax.
间接税提高生产或消费成本，旨在将外部成本内部化。从量税使供给曲线向上移动税额的距离。
Subsidies lower costs and encourage production or consumption, often used to internalise external benefits. They shift the supply curve downward.
补贴降低成本并鼓励生产或消费，常用于将外部收益内部化。它使供给曲线向下移动。
Price controls include maximum prices to make goods affordable and minimum prices to protect producers. Both can create shortages, surpluses or deadweight loss if set away from equilibrium.
价格控制包括使商品可负担的最高限价，以及保护生产者的最低限价。若偏离均衡价格，二者都可能造成短缺、过剩或无谓损失。
Government failure occurs when government intervention creates a net welfare loss. Causes include imperfect information, administrative costs, unintended consequences and regulatory capture.
政府失灵发生在政府干预造成净福利损失之时。原因包括信息不完全、行政成本、意外后果与监管俘获。
9. Macroeconomic Indicators: Growth, Inflation and Unemployment | 宏观经济指标：增长、通胀与失业
Gross domestic product (GDP) is the total value of goods and services produced in an economy over a period. Real GDP adjusts for inflation; nominal GDP does not.
国内生产总值（GDP）是一个经济体在一定时期内生产的商品与服务总价值。实际 GDP剔除通胀影响；名义 GDP则没有。
Inflation is a sustained rise in the general price level. Disinflation is a fall in the rate of inflation. Deflation is a fall in the general price level.
通货膨胀是物价总水平的持续上升。反通胀是通胀率的下降。通货紧缩是物价总水平的下降。
The Consumer Prices Index (CPI) measures inflation using a weighted basket of goods. The weights reflect average household spending patterns.
消费者价格指数（CPI）使用加权商品篮子衡量通胀。权重反映家庭平均支出模式。
Unemployment is the number of people willing and able to work but without a job. The claimant count measures those claiming unemployment benefits; the ILO measure uses a survey and is generally more internationally comparable.
失业是愿意且能够工作但没有工作的人数。申请人数统计衡量领取失业救济金的人数；ILO 统计采用调查方法，通常更具国际可比性。
Types of unemployment include frictional, structural, cyclical and seasonal. Structural unemployment is often the most damaging because it reflects a mismatch of skills.
失业类型包括摩擦性、结构性、周期性与季节性失业。结构性失业通常危害最大，因为它反映技能不匹配。
10. The AD/AS Model and Macroeconomic Equilibrium | 总需求/总供给模型与宏观经济均衡
Aggregate demand (AD) is the total planned spending on goods and services at each price level. It is made up of consumption, investment, government spending and net exports.
总需求（AD）是在每个价格水平上对商品与服务的计划总支出。它由消费、投资、政府支出与净出口构成。
AD = C + I + G + (X − M)
Short-run aggregate supply (SRAS) slopes upward because higher prices can raise profits and output in the short run. Long-run aggregate supply (LRAS) is vertical at the productive capacity of the economy.
短期总供给（SRAS）向上倾斜，因为在短期内更高价格可提高利润与产出。长期总供给（LRAS）在经济生产能力处呈垂直状态。
Macroeconomic equilibrium occurs where AD equals SRAS. A shift in AD or SRAS changes the price level and real output, affecting unemployment and inflation.
宏观经济均衡发生在 AD 等于 SRAS 之处。AD 或 SRAS 的移动会改变价格水平与实际产出，从而影响失业与通胀。
The multiplier shows how an initial change in spending creates a larger final change in national income:
乘数显示初始支出变化如何引起国民收入更大的最终变化：
k = 1 ÷ (1 − MPC)
An output gap is the difference between actual and potential output. A negative output gap means spare capacity and downward pressure on inflation.
产出缺口是实际产出与潜在产出之间的差额。负产出缺口意味着产能闲置与通胀下行压力。
11. Macroeconomic Policy: Fiscal, Monetary and Supply-Side | 宏观经济政策：财政、货币与供给侧政策
Fiscal policy uses government spending and taxation to influence AD. Expansionary fiscal policy raises spending or cuts taxes; contractionary fiscal policy does the opposite.
财政政策运用政府支出与税收影响总需求。扩张性财政政策增加支出或减税；紧缩性财政政策则相反。
Monetary policy is controlled by the central bank and uses interest rates, money supply and quantitative easing to influence AD and inflation. Lower interest rates tend to raise consumption and investment.
货币政策由中央银行控制，运用利率、货币供应与量化宽松影响总需求与通胀。降低利率往往会提高消费与投资。
Supply-side policies aim to increase productive capacity and shift LRAS to the right. They include education, infrastructure, deregulation and tax incentives.
供给侧政策旨在提高生产能力并使 LRAS 向右移动。包括教育、基础设施、放松管制与税收激励。
Automatic stabilisers are features such as progressive taxes and welfare benefits that reduce fluctuations in AD without deliberate government action.
自动稳定器是累进税与福利救济等机制，无需政府刻意行动即可减少总需求波动。
Crowding out occurs when government borrowing raises interest rates and reduces private investment, weakening the impact of expansionary fiscal policy.
挤出效应发生在政府借贷推高利率、减少私人投资，从而削弱扩张性财政政策效果之时。
12. Exam Technique and Memory Hooks | 考试技巧与记忆钩子
Use the DEFE structure for longer AQA answers: Define the key term, Explain the mechanism, use a Figure or diagram, and Evaluate with a judgement. This keeps your response focused and analytical.
在 AQA 长答题中使用 DEFE 结构：定义关键术语、解释机制、使用图表、并进行评价与判断。这能让你的回答聚焦且具分析性。
For definitions, always include the ceteris paribus condition where relevant. Examiners reward precision, especially in elasticity, market failure and macroeconomic questions.
定义时，凡相关处务必包含 ceteris paribus（其他条件不变）条件。考官重视精确性，尤其是在弹性、市场失灵与宏观经济学题目中。
Build contrast pairs to remember easily confused terms: scarcity vs shortage, inflation vs deflation, fiscal vs monetary, productive vs allocative efficiency, and merit vs demerit goods.
用对比配对记忆易混术语：稀缺与短缺、通胀与通缩、财政与货币、生产效率与配置效率、有益品与有害品。
Finally, practise writing one-sentence definitions from memory, then apply each term to a real-world example such as fuel prices, NHS waiting lists or interest rate changes. Application is where high marks are won.
最后，练习凭记忆写出一句话定义，再将每个术语应用到现实案例中，如燃油价格、NHS 等候名单或利率变化。应用能力才是高分所在。
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