📚 Essential Vocabulary from The Economist: A Glossary (Part I) | 《经济学人》常用词汇汇编（上）
Understanding the language of The Economist is key to grasping global economic discourse. This glossary provides clear, concise definitions of essential economic terms frequently encountered in its articles. From opportunity cost to market failure, mastering these concepts will enhance both your reading comprehension and your readiness for A‑Level Economics.
理解《经济学人》的语言是把握全球经济讨论的关键。本词汇表为文章中频繁出现的基本经济术语提供了清晰简洁的定义。从机会成本到市场失灵，掌握这些概念将提升你的阅读理解能力和 A‑Level 经济学备考水平。
1. Opportunity Cost | 机会成本
Opportunity cost represents the value of the next best alternative foregone when a choice is made. Because resources are scarce, every decision involves a trade‑off. For instance, if a government spends £10 billion on defence, the opportunity cost is the healthcare or education expenditure it must forgo.
机会成本代表做出选择时所放弃的次优替代方案的价值。由于资源稀缺，每个决策都涉及权衡取舍。例如，如果政府花费100亿英镑用于国防，那么机会成本就是它必须放弃的医疗或教育支出。
Opportunity cost extends beyond monetary costs; it includes time, utility, and any forgone benefits. Evaluating opportunity cost helps individuals and firms allocate resources efficiently.
机会成本不仅限于货币成本，它还包括时间、效用以及任何被放弃的收益。评估机会成本有助于个人和企业高效分配资源。
2. Supply and Demand | 供给与需求
Supply and demand form the foundation of market economics. The law of demand states that, ceteris paribus, as price rises, quantity demanded falls. The law of supply indicates that as price rises, quantity supplied rises. Equilibrium occurs where the two curves intersect.
供给与需求构成了市场经济的基础。需求定律指出，在其他条件不变的情况下，价格上升，需求量下降。供给定律表明，价格上升，供给量上升。均衡发生在供需曲线相交之处。
Shifts in demand or supply—due to factors like income, tastes, technology, or input costs—cause changes in equilibrium price and quantity. A rightward shift in demand, for example, typically raises both price and quantity.
需求或供给的变动——由收入、偏好、技术或投入成本等因素引起——会导致均衡价格和数量的变化。例如，需求曲线右移通常会同时推高价格和数量。
3. Elasticity | 弹性
Elasticity measures the responsiveness of one variable to a change in another. Price elasticity of demand (PED) is the percentage change in quantity demanded divided by the percentage change in price.
弹性衡量一个变量对另一个变量变化的反应程度。需求的价格弹性（PED）是需求量变化的百分比除以价格变化的百分比。
PED = %ΔQd ÷ %ΔP
If |PED| > 1, demand is elastic—consumers are highly responsive to price changes. If |PED| < 1, demand is inelastic. PED influences total revenue and tax incidence.
如果 |PED| > 1，需求富有弹性——消费者对价格变化反应强烈。如果 |PED| < 1，需求缺乏弹性。PED 会影响总收益和税收归宿。
4. Inflation | 通货膨胀
Inflation is a sustained increase in the general price level of goods and services in an economy over a period of time. It is commonly measured by the Consumer Price Index (CPI) or the GDP deflator.
通货膨胀是指一段时间内经济体中商品和服务总体价格水平的持续上涨。通常用消费者物价指数（CPI）或 GDP 平减指数来衡量。
Demand‑pull inflation occurs when aggregate demand exceeds aggregate supply, while cost‑push inflation arises from rising production costs, such as wages or raw materials. Moderate inflation is often seen as a sign of a growing economy, but hyperinflation can destabilise it.
需求拉动型通货膨胀发生在总需求超过总供给时，而成本推动型通货膨胀则源于工资或原材料等生产成本的上升。温和通胀通常被视为经济增长的标志，但恶性通胀会破坏经济稳定。
5. Gross Domestic Product (GDP) | 国内生产总值
GDP is the total monetary value of all final goods and services produced within a country’s borders in a specific time period, usually a quarter or a year. It serves as a broad measure of economic activity and growth.
GDP 是国内在一定时期内（通常为一个季度或一年）生产的所有最终商品和服务的货币总值。它是衡量经济活动与增长的广泛指标。
Nominal GDP uses current prices, while real GDP adjusts for inflation, providing a more accurate picture of economic performance. GDP per capita divides GDP by population, often used to compare living standards.
名义 GDP 使用当期价格，而实际 GDP 剔除了通胀因素，能更准确地反映经济表现。人均 GDP 将 GDP 除以人口规模，常用于比较生活水平。
6. Fiscal Policy | 财政政策
Fiscal policy involves government spending and taxation decisions aimed at influencing the economy. Expansionary fiscal policy—increased spending or tax cuts—boosts aggregate demand, while contractionary policy does the opposite to cool down an overheating economy.
财政政策涉及旨在影响经济的政府支出和税收决策。扩张性财政政策——增加支出或减税——会刺激总需求，而紧缩性财政政策则相反，用于给过热的经济降温。
Automatic stabilisers, such as progressive taxation and unemployment benefits, work without explicit government intervention to dampen economic fluctuations. The budget balance (surplus or deficit) reflects the stance of fiscal policy.
自动稳定器，如累进税制和失业救济金，无需政府明确干预即可缓和经济波动。预算余额（盈余或赤字）反映了财政政策的取向。
7. Monetary Policy | 货币政策
Monetary policy refers to actions by a central bank (such as the Bank of England or the Federal Reserve) to control the money supply and interest rates. Its primary goals often include price stability and supporting economic growth.
货币政策是指中央银行（如英格兰银行或美联储）为控制货币供给和利率而采取的行动。其主要目标通常包括价格稳定和支持经济增长。
Key tools include setting the policy interest rate, open market operations, and quantitative easing. Lowering interest rates encourages borrowing and investment, while raising rates can help contain inflation.
关键工具包括设定政策利率、公开市场操作和量化宽松。降低利率会鼓励借贷和投资，而提高利率则有助于抑制通胀。
8. Comparative Advantage | 比较优势
Proposed by David Ricardo, comparative advantage exists when a country can produce a good at a lower opportunity cost than another country. It provides the foundation for gains from trade, even if one country is absolutely less efficient in producing all goods.
由大卫·李嘉图提出，比较优势指一国能以比另一国更低的机会成本生产某种商品。即使一国在所有商品生产上都绝对更高效，比较优势仍构成贸易收益的基础。
Specialisation based on comparative advantage and free trade allows countries to consume beyond their production possibility frontiers. This principle explains why The Economist often advocates for reducing trade barriers.
基于比较优势的专业化和自由贸易能使各国消费超出其生产可能性边界。这一原理解释了为何《经济学人》经常倡导降低贸易壁垒。
9. Exchange Rate | 汇率
An exchange rate is the price of one currency in terms of another. It can be floating, determined by market forces of supply and demand, or fixed, pegged by a government to another currency or a basket of currencies.
汇率是一种货币以另一种货币表示的价格。它可以是浮动的，由市场供需力量决定；也可以是固定的，由政府将货币与另一种货币或一篮子货币挂钩。
A depreciation (weakening) of a currency makes exports cheaper and imports more expensive, potentially improving the trade balance. Appreciation has the opposite effect. Exchange rate fluctuations can also influence inflation and foreign investment.
货币贬值（走弱）会使出口更便宜、进口更昂贵，从而可能改善贸易收支。升值则产生相反效果。汇率波动还会影响通胀和外国投资。
10. Market Failure | 市场失灵
Market failure occurs when the free market fails to allocate resources efficiently, leading to a net welfare loss. Common causes include externalities, public goods, information asymmetry, and market power.
当自由市场无法有效配置资源，导致净福利损失时，就发生市场失灵。常见原因包括外部性、公共物品、信息不对称和市场势力。
Negative externalities, such as pollution, impose costs on third parties not reflected in market prices. Positive externalities, like education, generate social benefits beyond the private gain. Government intervention—taxes, subsidies, regulation—aims to correct these failures.
负外部性（如污染）将成本强加给第三方，且市场价格未予反映。正外部性（如教育）产生的社会效益超出个人收益。政府干预——税收、补贴、监管——旨在纠正这些失灵。
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