📚 Year 11 AQA Economics: Key Vocabulary and Terms Quick-Memorization Guide | Year 11 AQA 经济：词汇术语速记指南
Mastering the essential vocabulary of AQA GCSE Economics is the first step to confidently tackling exam questions. This guide provides a structured collection of key terms, grouped by topic, along with memory hacks and connections to help you recall definitions swiftly and accurately.
掌握 AQA GCSE 经济学的核心词汇是自信应对考试题的第一步。本指南按主题分组提供了关键术语集合，并附上记忆技巧和联系，帮助你快速准确地回忆定义。
1. The Fundamental Economic Problem | 基本经济问题
Scarcity exists because there are unlimited wants but limited resources. This forces individuals, firms, and governments to make choices about how to allocate scarce resources.
稀缺性的存在是因为无限的需求与有限的资源之间的矛盾。这迫使个人、企业和政府就如何分配稀缺资源做出选择。
Opportunity cost is the value of the next best alternative forgone when a choice is made. It represents what you give up to get something else.
机会成本是指做出选择时所放弃的次优替代方案的价值。它代表了你为了得到某样东西而放弃的另一样东西。
Economic goods are scarce and command a price, while free goods are abundant and have no opportunity cost (e.g., air, sunlight).
经济物品是稀缺且有价格的物品，而免费物品则丰富且没有机会成本（如空气、阳光）。
A need is something essential for survival (food, shelter), whereas a want is something desirable but not essential (a smartphone).
需要是生存所必需的东西（食物、住所），而需求则是想要但并非必需的东西（智能手机）。
2. Factors of Production and the PPF | 生产要素与生产可能性边界
The four factors of production are land (natural resources), labour (workforce), capital (machinery and equipment), and enterprise (the willingness to take risks and combine the other factors).
四种生产要素是土地（自然资源）、劳动（劳动力）、资本（机器设备）和企业精神（承担风险并整合其他要素的意愿）。
The production possibility frontier (PPF) shows the maximum combinations of two goods an economy can produce when all resources are fully and efficiently employed. Points inside the curve indicate under-utilisation of resources.
生产可能性边界（PPF）显示了一个经济体在全部资源得到充分有效利用时所能生产的两种商品的最大组合。曲线内的点表示资源没有得到充分利用。
A shift outward of the PPF represents economic growth, often achieved through improvements in technology or an increase in the quantity/quality of resources.
PPF 向外移动代表经济增长，通常通过技术进步或资源数量/质量的提升实现。
3. Demand and Supply | 需求与供给
The law of demand states that, ceteris paribus, as the price of a good rises, the quantity demanded falls. It is represented by a downward-sloping curve.
需求定律指出，在其他条件不变的情况下，当一种商品的价格上升时，需求量会下降。它表示为一条向下倾斜的曲线。
The law of supply states that, ceteris paribus, as the price of a good rises, the quantity supplied increases. The supply curve slopes upward.
供给定律指出，在其他条件不变的情况下，当一种商品的价格上升时，供给量会增加。供给曲线向上倾斜。
Market equilibrium occurs where demand equals supply. At this price, there is no tendency for price to change. Excess demand (shortage) exists when price is below equilibrium; excess supply (surplus) exists when price is above equilibrium.
市场均衡出现在需求等于供给之处。在此价格下，价格没有变动的趋势。当价格低于均衡价格时，存在超额需求（短缺）；当价格高于均衡价格时，存在超额供给（过剩）。
4. Price Elasticity of Demand (PED) | 需求价格弹性
PED measures the responsiveness of quantity demanded to a change in price. It is calculated as:
PED 衡量需求量对价格变化的反应程度。计算公式为：
PED = % change in quantity demanded / % change in price
ce changes). If PED < 1, demand is price inelastic. If PED = 1, demand is unitary elastic.
若 PED > 1，需求是有弹性的（消费者对价格变化敏感）。如果 PED < 1，需求缺乏弹性。如果 PED = 1，需求是单位弹性。
Factors affecting PED include availability of substitutes, whether the good is a necessity or luxury, and the proportion of income spent on the good. Remember: 'S'ubstitutes, 'N'ecessity, 'T'ime.
影响 PED 的因素包括替代品的可用性、商品是必需品还是奢侈品，以及在该商品上的支出占收入的比例。记住缩写 S.N.T.：替代品（Substitutes）、必需品（Necessity）、时间（Time）。
5. Other Elasticities and Revenue | 其他弹性与收益
Price elasticity of supply (PES) measures how responsive quantity supplied is to a change in price. A PES greater than 1 indicates elastic supply; time period is the key determinant.
供给价格弹性 (PES) 衡量供给量对价格变化的反应程度。PES 大于 1 表示供给有弹性；时间周期是关键的决定因素。
Income elasticity of demand (YED) measures the responsiveness of demand to a change in income. For normal goods, YED is positive; for inferior goods, YED is negative.
需求收入弹性 (YED) 衡量需求对收入变化的反应程度。对于正常商品，YED 为正；对于低档商品，YED 为负。
Cross elasticity of demand (XED) measures the responsiveness of demand for one good to a change in the price of another. Positive XED indicates substitutes; negative XED indicates complements.
需求交叉弹性 (XED) 衡量一种商品的需求对另一种商品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。
eavily influenced by PED. If demand is elastic, lowering price raises revenue; if inelastic, raising price raises revenue.
总收益（价格 × 数量）受 PED 影响很大。如果需求有弹性，降价会增加收益；如果缺乏弹性，提价会增加收益。
6. Market Failure and Externalities | 市场失灵与外部性
Market failure occurs when the free market fails to allocate resources efficiently, leading to a net social welfare loss. Common causes are externalities, public goods, information gaps, and market power.
当自由市场未能有效配置资源，导致社会净福利损失时，就发生了市场失灵。常见原因包括外部性、公共物品、信息不对称和市场势力。
A positive externality is a benefit enjoyed by a third party as a result of an economic transaction (e.g., improved health from vaccinations). A negative externality is a cost imposed on a third party (e.g., pollution from a factory).
正外部性是经济交易给第三方带来的好处（例如疫苗接种改善他人健康）。负外部性是强加给第三方的成本（例如工厂污染）。
it + external benefit. Market equilibrium only accounts for private costs and benefits, causing over-consumption of goods with negative externalities and under-consumption of goods with positive externalities.
社会成本 = 私人成本 + 外部成本。社会收益 = 私人收益 + 外部收益。市场均衡只考虑私人成本和收益，导致具有负外部性的商品被过度消费，具有正外部性的商品消费不足。
7. Public Goods, Merit and Demerit Goods | 公共品、优效品与劣效品
Public goods are non-excludable (you cannot prevent non-payers from benefiting) and non-rivalrous (one person's consumption does not reduce availability for others). Examples include street lighting and national defence. They cause market failure because the free market will not provide them.
公共物品具有非排他性（无法阻止未付费者受益）和非竞争性（一个人的消费不会减少他人的可用性）。例子包括路灯和国防。它们导致市场失灵，因为自由市场不会提供它们。
Merit goods are goods that are under-provided and under-consumed by the market because individuals do not fully appreciate their private and social benefits (e.g., education, healthcare). Governments often provide or subsidise them.
优效品是指市场提供和消费不足的商品，因为个人没有充分认识到它们的私人和社会收益（如教育、医疗）。政府通常会提供或补贴这些商品。
Demerit goods are goods that are over-provided and over-consumed by the market because individuals ignore the harm they cause (e.g., tobacco, alcohol). The government often intervenes with taxation, bans, or information campaigns.
劣效品是指市场提供和消费过度的商品，因为人们忽略了它们造成的危害（如烟草、酒精）。政府经常通过征税、禁止或宣传运动进行干预。
8. Government Intervention to Correct Market Failure | 纠正市场失灵的政府干预
Indirect taxation (e.g., sugar tax) can internalise the negative externality by raising the price of demerit goods, reducing quantity to the socially optimum level. A subsidy works in the opposite direction, encouraging consumption of merit goods.
间接税（如糖税）可以通过提高劣效品的价格，将负外部性内部化，将数量减少到社会最优水平。补贴则相反，鼓励优效品的消费。
Regulation involves setting rules limiting harmful activities, such as pollution permits or age restrictions on alcohol sales. However, it can be costly to enforce.
监管涉及设定限制有害活动的规则，如污染许可证或酒精销售的年龄限制。然而，执行起来可能成本高昂。
Information provision helps correct information failure. For example, mandatory nutritional labelling addresses the under-appreciation of health risks associated with demerit goods.
信息提供有助于纠正信息失灵。例如，强制性的营养标签解决了人们对劣效品健康风险的认知不足问题。
9. Macroeconomic Objectives | 宏观经济目标
The main macroeconomic objectives are: sustainable economic growth, low and stable inflation (UK target 2% CPI), low unemployment, and a balanced current account on the balance of payments. Governments also aim for a stable exchange rate and an equitable distribution of income.
主要的宏观经济目标是：可持续的经济增长、低而稳定的通胀（英国消费者物价指数目标为 2%）、低失业率，以及国际收支中经常账户的平衡。政府还力求稳定汇率和公平的收入分配。
Gross Domestic Product (GDP) measures the total value of goods and services produced in a country over a period. Real GDP strips out the effect of inflation to give a more accurate picture of growth.
国内生产总值（GDP）衡量一个国家在一段时间内生产的商品和服务的总价值。实际 GDP 剔除了通胀影响，能更准确地反映增长情况。
The claimant count measures unemployment by counting those receiving jobseeker's allowance. The Labour Force Survey (LFS) is an alternative measure based on a survey of households.
失业救济金申请人数通过统计领取求职者津贴的人数来衡量失业。劳动力调查 (LFS) 是基于家庭调查的另一种衡量方法。
10. Aggregate Demand and Aggregate Supply | 总需求与总供给
Aggregate demand (AD) is the total spending on UK-produced goods and services at a given price level. Its components are: Consumption (C) + Investment (I) + Government spending (G) + Net exports (X - M).
总需求 (AD) 是在一定价格水平下对英国生产的商品和服务的总支出。其组成部分是：消费 (C) + 投资 (I) + 政府支出 (G) + 净出口 (X - M)。
Short-run aggregate supply (SRAS) shows the total output firms are willing to produce at different price levels, assuming factor prices (like wages) are fixed. It is upward sloping because higher prices increase profit margins.
短期总供给 (SRAS) 显示了在要素价格（如工资）固定不变的假设下，企业愿意在不同价格水平下生产的产量。由于更高价格能增加利润率，曲线向上倾斜。
Long-run aggregate supply (LRAS) is vertical at the economy's full-employment output level (potential GDP). Shifts in LRAS come from changes in the quantity/quality of factors of production, i.e., supply-side improvements.
长期总供给 (LRAS) 在经济体的充分就业产出水平（潜在 GDP）处垂直。LRAS 的移动源于生产要素数量/质量的变化，即供给侧改善。
11. Fiscal and Monetary Policy | 财政与货币政策
Fiscal policy involves the government adjusting its spending levels and tax rates to influence aggregate demand. Expansionary fiscal policy (higher G, lower T) boosts AD; contractionary policy does the opposite. A budget deficit occurs when G exceeds T.
财政政策涉及政府调整支出水平和税率以影响总需求。扩张性财政政策（较高 G、较低 T）会提振 AD；紧缩性政策则相反。当 G 超过 T 时就会出现预算赤字。
Monetary policy is the control of interest rates and the money supply by the central bank (Bank of England) to achieve price stability. Lower interest rates encourage borrowing and spending, thus increasing AD.
货币政策是中央银行（英格兰银行）通过控制利率和货币供应来实现价格稳定。较低的利率鼓励借贷和消费，从而增加 AD。
Supply-side policies are long-term strategies to increase the productive capacity of the economy, shifting LRAS rightwards. Examples include education and training, tax reforms, and deregulation.
供给侧政策是提高经济生产能力的长期战略，使 LRAS 向右移动。例子包括教育和培训、税制改革和放松管制。
12. International Trade and Exchange Rates | 国际贸易与汇率
Free trade occurs when countries exchange goods and services without barriers. The benefits include lower prices for consumers, increased competition, and access to a wider variety of goods. Protectionism uses tariffs, quotas, and regulations to restrict imports.
当各国在没有壁垒的情况下交换商品和服务时，就发生了自由贸易。其好处包括消费者价格更低、竞争加剧，以及获得更丰富的商品种类。贸易保护主义则使用关税、配额和法规来限制进口。
The exchange rate is the price of one currency in terms of another. An appreciation means the currency becomes stronger (buys more foreign currency), making exports dearer and imports cheaper. A depreciation has the opposite effect.
汇率是一种货币以另一种货币表示的价格。升值意味着该货币变得更强势（能买到更多外币），使得出口更贵，进口更便宜。贬值则产生相反的效果。
The current account of the balance of payments records trade in goods, trade in services, and income flows. A deficit arises when imports exceed exports, a surplus when exports exceed imports.
国际收支中的经常账户记录商品贸易、服务贸易和收入流动。当进口超过出口时出现赤字，当出口超过进口时出现盈余。
13. High-Priority Confusable Terms and Memory Tricks | 高优先级易混淆术语与记忆技巧
PED vs. YED: PED relates to price changes, YED relates to income changes. Think 'P' for Price, 'Y' for Yield (income). Normal goods have positive YED; inferior goods have negative YED — link 'inferior' with 'negative' because you buy less when you earn more.
PED 对比 YED：PED 与价格变化相关，YED 与收入变化相关。记住 P 代表价格（Price），Y 代表收入（Yield）。正常商品的 YED 为正；低档商品的 YED 为负——把“低档”与“消极”联系起来，因为收入越高你买得越少。
Merit good vs. Public good: A merit good (e.g., museum) is provided by the market but under-consumed; it is not non-excludable. A public good (e.g., lighthouse) is non-excludable and non-rival, so the market fails completely. Use the acronym 'NON': Public goods have NON-excludability and NON-rivalry.
优效品对比公共品：优效品（如博物馆）由市场提供但消费不足；它并非非排他性。公共品（如灯塔）是非排他且非竞争的，因此市场完全失灵。使用缩略词 'NON'：公共品具有 NON-排他性和 NON-竞争性。
Cost-push inflation vs. Demand-pull inflation: Cost-push arises from higher costs of production (SRAS shifts left); demand-pull arises from excessive AD growth (AD shifts right). Think of 'push' from the supply side and 'pull' from the demand side.
成本推动型通胀对比需求拉动型通胀：成本推动源自生产成本上升（SRAS 左移）；需求拉动源自 AD 过度增长（AD 右移）。想象“推动”来自供给侧，“拉动”来自需求侧。
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