📚 Year 11 AQA Economics: Core Knowledge Review | Year 11 AQA 经济：核心知识点梳理
In Year 11, AQA GCSE Economics brings together everything you have learned into one big picture of how markets and economies work. This article pulls out the most important core concepts you need to master for Papers 1 and 2, covering microeconomics and macroeconomics in a clear, revision-friendly way.
在 11 年级，AQA 的 GCSE 经济学将你学到的所有知识整合成一个关于市场和经济如何运作的大图景。本文提炼了你在 Paper 1 和 Paper 2 中必须掌握的最重要的核心概念，以清晰、便于复习的方式梳理微观经济学和宏观经济学。
1. Scarcity and Choice | 稀缺性与选择
Economics exists because of scarcity. Resources are limited, but human wants are unlimited, so individuals, firms and governments must make choices about what to produce, how to produce and for whom to produce.
经济学的存在源于稀缺性。资源是有限的，而人的欲望是无限的，因此个人、企业和政府必须就生产什么、如何生产以及为谁生产做出选择。
The opportunity cost of a decision is the value of the next best alternative forgone. If you spend an hour revising economics instead of maths, the opportunity cost is the benefit you would have gained from studying maths.
一项决策的机会成本是所放弃的次优选择的价值。如果你花一小时复习经济学而不是数学，机会成本就是你原本可以从学习数学中获得的收益。
Factors of production are the inputs used to create goods and services. They are land (natural resources), labour (workforce), capital (machinery and equipment) and enterprise (the skill of bringing the other three together and taking risks).
生产要素是用于创造产品和服务的投入。它们包括土地（自然资源）、劳动力（工人）、资本（机器和设备）和企业家的才能（将其他三个要素结合起来并承担风险的技能）。
| Factor 要素 | Reward 报酬 |
|---|---|
| Land 土地 | Rent 地租 |
| Labour 劳动力 | Wages 工资 |
| Capital 资本 | Interest 利息 |
| Enterprise 企业家才能 | Profit 利润 |
2. Demand and Supply | 需求与供给
Demand is the quantity of a good or service consumers are willing and able to buy at a given price over a period of time. The law of demand states that, ceteris paribus, there is an inverse relationship between price and quantity demanded.
需求是指在一定时期内，消费者在给定价格下愿意并且能够购买的商品或服务的数量。需求定律指出，在其他条件不变的情况下，价格与需求量之间存在反向关系。
Movements along the demand curve occur when price changes, while shifts of the curve happen when a non-price factor (income, tastes, price of substitutes/complements, population) changes.
当价格变化时，需求曲线上的点会发生移动；而当非价格因素（收入、偏好、替代品/互补品价格、人口）变化时，整条需求曲线会发生平移。
Supply is the quantity producers are willing and able to sell at a given price. The law of supply states a positive relationship between price and quantity supplied.
供给是指生产者在给定价格下愿意并能够出售的数量。供给定律指出价格与供给量之间存在正向关系。
Equilibrium occurs where quantity demanded equals quantity supplied. Excess demand causes prices to rise, while excess supply pushes prices down. This is the price mechanism allocating resources.
均衡出现在需求量与供给量相等的地方。超额需求导致价格上升，超额供给则推动价格下降。这就是价格机制分配资源的方式。
3. Price Elasticity | 价格弹性
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price. It is calculated as:
需求价格弹性 (PED) 衡量的是需求量对价格变化的反应程度。其计算公式为：
PED = (%ΔQd) / (%ΔP)
If |PED| > 1, demand is elastic; if |PED| < 1, demand is inelastic; if |PED| ED helps firms predict revenue changes: cutting price raises total revenue if demand is elastic, and lowers it if demand is inelastic.
如果 |PED| > 1，需求富有弹性；|PED| < 1，需求缺乏弹性；|PED| = 1，需求单位弹性。了解 PED 有助于企业预测收益变化：如果需求富有弹性，降价会增加总收入；如果需求缺乏弹性，降价则会减少总收入。
of supply (PES) measures the responsiveness of quantity supplied to price changes. PES = (%ΔQs) / (%ΔP). Supply is elastic when firms can increase output easily and relatively quickly.
供给价格弹性 (PES) 衡量的是供给量对价格变化的反应程度。PES = (%ΔQs) / (%ΔP)。当企业能够相对容易且较快地增加产量时，供给是富有弹性的。
4. Market Structures and Competition | 市场结构与竞争
Market structure affects pricing and output decisions. Perfect competition has many buyers and sellers, homogeneous products, no barriers to entry or exit, and perfect information. Firms are price takers.
市场结构影响着定价和产量决策。完全竞争市场有许多买者和卖者，产品同质，没有进入或退出壁垒，信息完全。企业是价格接受者。
Monopoly exists when a single firm dominates the market, often because of high barriers to entry (legal, economies of scale, ownership of key resources). Monopolists can restrict output and charge higher prices, potentially leading to market failure.
当一家企业因其高进入壁垒（法律、规模经济、关键资源所有权）而主导市场时，就形成了垄断。垄断者可以限制产量并收取更高价格，这可能导致市场失灵。
Competition generally benefits consumers through lower prices, higher quality and greater innovation. Governments may regulate monopolies or promote competition to protect consumer interests.
竞争通常通过更低的价格、更高的质量和更多的创新使消费者受益。政府可能会监管垄断企业或促进竞争以保护消费者利益。
5. The Labour Market | 劳动力市场
The demand for labour is derived from the demand for the goods and services that labour produces. Firms hire workers when the revenue generated by an extra worker (marginal revenue product) exceeds the wage cost.
劳动力的需求是派生需求，来源于对劳动力所生产的产品和服务的需求。当额外一名工人所带来的收入（边际收益产量）超过工资成本时，企业就会雇佣工人。
Wages are determined by the interaction of demand and supply of labour. Supply depends on factors such as the wage rate, barriers to entry (qualifications, training), and non-wage benefits. Differentials in wages exist due to differences in skill, education, risk, and working conditions.
工资由劳动力需求和供给的相互作用决定。供给取决于工资率、进入壁垒（资格证书、培训）和非工资福利等因素。由于技能、教育、风险和劳动条件的差异，工资会存在差异。
6. Production, Costs and Revenue | 生产、成本与收入
Production converts inputs into outputs. Productivity measures output per unit of input (e.g., labour productivity). Specialisation and division of labour increase productivity, but repetitive tasks may lower worker motivation.
生产将投入转化为产出。生产率衡量每单位投入的产出量（例如劳动生产率）。专业化和劳动分工能提高生产率，但重复性任务可能会降低工人的积极性。
is total cost divided by output. Revenue is price × quantity sold. Profit = total revenue – total cost.
企业面临固定成本（租金、利息）和可变成本（原材料、工资）。总成本 = 固定成本 + 可变成本。平均成本等于总成本除以产量。收入 = 价格 × 销售量。利润 = 总收入 – 总成本。
Economies of scale occur when average costs fall as output increases, owing to reasons like technical, purchasing or financial economies. Diseconomies of scale arise when further growth leads to rising average costs, often from communication and coordination problems.
规模经济是指随着产量增加，平均成本下降，这源于技术、采购或财务等方面的经济性。规模不经济则是指进一步增长导致平均成本上升，通常源于沟通和协调问题。
7. Market Failure | 市场失灵
Market failure occurs when the price mechanism fails to allocate resources efficiently. Key causes include positive and negative externalities, public goods, and information asymmetry.
市场失灵发生在价格机制无法有效配置资源的情况下。主要原因包括正负外部性、公共物品和信息不对称。
Negative externalities (e.g., pollution) impose costs on third parties. Positive externalities (e.g., vaccination) confer benefits on third parties. Both lead to a misallocation of resources because private costs/benefits differ from social costs/benefits.
负外部性（例如污染）给第三方带来成本。正外部性（例如疫苗接种）给第三方带来收益。这两者都会导致资源配置不当，因为私人成本/收益与社会成本/收益存在差异。
Public goods are non-excludable and non-rival. Free-riding means they would be under-provided by the market (e.g., street lighting, national defence). Governments often intervene to provide these directly or subsidise their production.
公共物品具有非排他性和非竞争性。搭便车问题意味着市场会提供不足的公共物品（例如路灯、国防）。政府通常直接提供或补贴生产来干预。
8. Macroeconomic Objectives | 宏观经济目标
Governments typically aim for four main macroeconomic objectives: stable economic growth, low and stable unemployment, price stability (low inflation), and a sustainable balance of payments on the current account.
政府通常追求四个主要的宏观经济目标：稳定的经济增长、低且稳定的失业、物价稳定（低通胀）以及可持续的国际收支经常项目平衡。
Economic growth is measured by the percentage change in real GDP. Full employment does not mean zero unemployment; some frictional and structural unemployment is normal. Price stability is commonly targeted at 2% CPI inflation. A current account deficit must be financeable in the long run.
经济增长通过实际 GDP 的百分比变化来衡量。充分就业并不意味着零失业；一些摩擦性和结构性失业是正常的。物价稳定通常以 2% 的 CPI 通胀率作为目标。经常项目逆差必须能够在长期内得到融资。
9. Economic Growth | 经济增长
Economic growth refers to an increase in a country's productive capacity, illustrated by an outward shift of the production possibility frontier (PPF) or long-run aggregate supply (LRAS). Short-run growth can come from making more use of existing spare capacity.
经济增长是指一个国家生产能力的提高，表现为生产可能性边界 (PPF) 或长期总供给 (LRAS) 向外移动。短期增长可以通过更多地利用现有闲置产能来实现。
Key drivers of long-run growth include improvements in the quantity and quality of factors of production: investment in physical capital, better education and training, technological progress, and institutional stability. Growth raises living standards but may bring environmental costs.
长期增长的关键驱动力包括生产要素数量与质量的提高：对物质资本的投资、更好的教育和培训、技术进步以及制度稳定。增长能提高生活水平，但也可能带来环境成本。
10. Unemployment and Inflation | 失业与通货膨胀
Unemployment refers to people who are able, available and actively seeking work but cannot find a job. Common types include cyclical (due to low demand), structural (mismatch of skills), and frictional (between jobs). High unemployment wastes resources and increases government spending on benefits.
失业是指有能力、有工作意愿且正在积极寻找工作但无法找到工作的人。常见类型包括周期性失业（需求不足）、结构性失业（技能错配）和摩擦性失业（换工作期间）。高失业浪费资源并增加政府的福利支出。
Inflation is the sustained rise in the general price level. In the UK it is measured by the Consumer Prices Index (CPI). Demand-pull inflation occurs when aggregate demand grows faster than aggregate supply. Cost-push inflation results from rising production costs (e.g., energy, wages). High inflation erodes purchasing power and can distort spending decisions.
通货膨胀是整体物价水平的持续上升。英国用消费者价格指数 (CPI) 来衡量。需求拉动型通胀发生在总需求增长快于总供给时。成本推动型通胀源于生产成本上升（如能源、工资）。高通胀侵蚀购买力并可能扭曲支出决策。
11. Government Policies | 政府政策
Fiscal policy involves changes in government spending and taxation to influence the economy. Expansionary fiscal policy (higher spending or lower taxes) boosts demand; contractionary policy does the opposite. A government budget deficit occurs when spending exceeds tax revenue.
财政政策涉及改变政府支出和税收来影响经济。扩张性财政政策（增加支出或减税）会刺激需求；紧缩性政策则相反。当政府支出超过税收收入时，就会出现预算赤字。
Monetary policy uses interest rates and the money supply to manage demand. In the UK, the Bank of England sets the base rate. Lower interest rates encourage borrowing and spending, while higher rates cool an overheating economy.
货币政策通过利率和货币供给来管理需求。在英国，英格兰银行设定基准利率。较低的利率鼓励借贷和消费，而较高的利率则为过热的经济降温。
Supply-side policies aim to increase the productive potential of the economy by improving the efficiency of factor markets. Examples include investment in education and training, tax reforms, and privatisation to increase competition.
供给侧政策旨在通过提高要素市场的效率来增加经济的生产潜力。例子包括投资教育和培训、税收改革以及私有化以增加竞争。
12. International Trade and Globalisation | 国际贸易与全球化
International trade allows countries to specialise according to comparative advantage, increasing world output. The UK exports services (finance, insurance) and imports goods (cars, electronics). A current account deficit means imports exceed exports.
国际贸易使各国能够根据比较优势进行专业化生产，从而提高世界产出。英国出口服务（金融、保险）并进口商品（汽车、电子产品）。经常项目逆差意味着进口超过出口。
Protectionism uses tariffs, quotas and non-tariff barriers to shield domestic industries. While protecting jobs in the short run, it can raise prices and reduce choice for consumers. The World Trade Organisation (WTO) works to reduce trade barriers.
贸易保护主义使用关税、配额和非关税壁垒来保护国内产业。虽然在短期内保护就业，但它可能提高价格并减少消费者选择。世界贸易组织 (WTO) 致力于减少贸易壁垒。
Globalisation is the increasing integration of the world's economies. It brings benefits such as access to larger markets and cheaper imports, but also challenges like deindustrialisation and increased competitive pressure on domestic firms. Multinational corporations (MNCs) play a key role by operating in many countries.
全球化是世界经济日益一体化。它带来进入更大市场和更便宜进口商品等好处，但也带来去工业化和对国内企业竞争压力加大等挑战。跨国公司在许多国家经营，扮演着关键角色。
Exchange rates express one currency in terms of another. A depreciation of the pound makes UK exports cheaper and imports more expensive, potentially improving the current account. An appreciation has the opposite effect.
汇率是一种货币用另一种货币表示的价格。英镑贬值使英国出口更便宜、进口更昂贵，可能会改善经常项目。升值则产生相反的效果。
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