📚 Core IGCSE Economics Revision for Year 11 | Year 11 剑桥 IGCSE 经济核心知识点梳理
This article provides a concise yet comprehensive review of the key concepts covered in the Year 11 Cambridge IGCSE Economics syllabus. Understanding these fundamentals is essential for exam success and for applying economic reasoning to real-world situations.
本文为 Year 11 剑桥 IGCSE 经济课程的核心知识点提供了简明而全面的梳理。掌握这些基础知识不仅对考试至关重要，也有助于将经济学思维运用于现实情境。
1. The Basic Economic Problem | 基本经济问题
Economics is the study of how to allocate scarce resources to satisfy unlimited wants. Because resources are limited, individuals, firms, and governments must make choices, which inevitably involve opportunity cost — the next best alternative foregone.
经济学研究如何配置稀缺的资源来满足无限的需求。由于资源有限，个人、企业和政府都必须做出选择，而选择必然涉及机会成本——所放弃的次优替代选择。
The three fundamental economic questions are: What goods and services should be produced? How should they be produced? And for whom should they be produced? Different economic systems (market, planned, mixed) answer these questions differently.
三个基本经济问题是：应该生产什么商品和服务？如何生产？为谁生产？不同的经济体制（市场经济、计划经济、混合经济）以不同方式回答这些问题。
2. Factors of Production | 生产要素
The factors of production are the resources used to produce goods and services. They are classified into four categories: land (all natural resources), labour (human effort), capital (man-made goods used in production), and enterprise (the risk-taking ability to organise the other factors).
生产要素是用于生产商品和服务的资源，分为四类：土地（所有自然资源）、劳动力（人的努力）、资本（用于生产的人造物品）以及企业家才能（承担风险、组织其他要素的能力）。
Each factor earns a corresponding reward: land earns rent, labour earns wages, capital earns interest, and enterprise earns profit. The quality and quantity of these factors determine a country's productive potential.
每种要素获得相应的报酬：土地获得地租，劳动力获得工资，资本获得利息，企业家才能获得利润。这些要素的质量和数量决定了一个国家的生产潜力。
3. Opportunity Cost and the PPC | 机会成本与生产可能性曲线
The Production Possibility Curve (PPC) shows the maximum combinations of two goods that an economy can produce with its existing resources and technology, assuming full and efficient employment. Moving along the curve involves an opportunity cost, as producing more of one good requires sacrificing some of the other.
生产可能性曲线 (PPC) 展示了一个经济体在现有资源和技术下、并假设充分有效就业时，所能生产的两种商品的最大组合。沿曲线移动涉及机会成本，因为增加一种商品的生产需要牺牲另一种商品。
An outward shift of the PPC indicates economic growth, caused by an increase in the quantity or quality of resources or technological progress. Points inside the curve represent inefficient use of resources or unemployment.
PPC 向外移动表示经济增长，这由资源数量或质量的提高或技术进步引起。曲线内的点代表资源利用无效率或存在失业。
4. Demand and Supply | 需求与供给
Demand is the quantity of a good or service that consumers are willing and able to buy at various prices over a period of time, ceteris paribus. The law of demand states that as price rises, quantity demanded falls, leading to a downward-sloping demand curve.
需求是指在一定时期内，消费者在各种价格水平下愿意并能够购买的商品或服务的数量，假定其他条件不变。需求定律表明，价格上涨，需求量下降，因此需求曲线向右下方倾斜。
Factors that shift the demand curve include changes in income, tastes, prices of related goods (substitutes and complements), and expectations. A rise in income shifts demand for normal goods to the right, but for inferior goods, it shifts demand to the left.
导致需求曲线移动的因素包括收入变化、偏好、相关商品（替代品和互补品）价格以及预期。收入上升会使正常品的需求曲线向右移动，但会使低档品的需求曲线向左移动。
Supply is the quantity producers are willing and able to offer for sale at various prices. The law of supply shows a positive relationship between price and quantity supplied, resulting in an upward-sloping supply curve.
供给是指生产者愿意并能够在各个价格水平下提供的销售数量。供给定律表明价格与供给量之间存在正相关关系，因此供给曲线向右上方倾斜。
Shifts in supply occur due to changes in production costs, technology, taxes, subsidies, and the number of sellers. Lower costs or improved technology shift the supply curve to the right, increasing supply at every price.
供给曲线的移动由生产成本、技术、税收、补贴和卖者数量等因素的变化引起。成本降低或技术进步会使供给曲线向右移动，在每个价格水平上增加供给。
5. Price Elasticity of Demand and Supply | 需求与供给的价格弹性
Price elasticity of demand (PED) measures the responsiveness of quantity demanded to a change in price.
需求的价格弹性 (PED) 衡量需求量对价格变动的反应程度。
PED = %ΔQd ÷ %ΔP
tic. Factors affecting PED include availability of substitutes, degree of necessity, proportion of income spent, and time period.
若 PED > 1，需求富有弹性（奢侈品、替代品多）；若 PED < 1，需求缺乏弹性（必需品、成瘾性商品）；若 PED = 1，则为单位弹性。影响 PED 的因素包括替代品的可获得性、必需程度、占收入的比例以及时间长短。
Price elasticity of supply (PES) measures the responsiveness of quantity supplied to a price change.
供给的价格弹性 (PES) 衡量供给量对价格变动的反应程度。
PES = %ΔQs ÷ %ΔP
Supply tends to be more elastic in the long run as firms can adjust all inputs. Factors include time period, spare capacity, and availability of stocks.
长期中供给往往更有弹性，因为企业可以调整所有投入。影响因素包括时间跨度、闲置产能和库存可得性。
6. Market Equilibrium and Disequilibrium | 市场均衡与失衡
Market equilibrium occurs where quantity demanded equals quantity supplied, determining the equilibrium price. If the price is set above equilibrium, a surplus (excess supply) arises, putting downward pressure on price. If below equilibrium, a shortage (excess demand) occurs, pushing price upwards.
市场均衡发生在需求量等于供给量之处，由此决定均衡价格。若价格设定在均衡之上，则出现过剩（超额供给），对价格产生下行压力；若低于均衡，则出现短缺（超额需求），推动价格上升。
Changes in demand or supply cause shifts in equilibrium. An increase in demand raises both equilibrium price and quantity; an increase in supply lowers equilibrium price but raises quantity. Understanding these shifts is crucial for analyzing market events.
需求或供给的变化会导致均衡移动。需求增加会提高均衡价格和均衡数量；供给增加会降低均衡价格但提高均衡数量。理解这些移动对分析市场事件至关重要。
7. Market Failure | 市场失灵
Market failure occurs when the free market fails to allocate resources efficiently, resulting in a net social welfare loss. Key causes include externalities (positive and negative), public goods (non-excludable and non-rivalrous), merit and demerit goods, information asymmetries, and market power (monopoly).
当自由市场无法有效配置资源，导致社会净福利损失时，就出现了市场失灵。主要成因包括外部性（正外部性和负外部性）、公共物品（非排他性和非竞争性）、优值品和劣值品、信息不对称以及市场势力（垄断）。
Negative externalities, such as pollution, lead to overproduction because producers ignore external costs. Positive externalities, like education, lead to underproduction. Governments can intervene through taxes, subsidies, regulation, and provision of public goods to correct these failures.
负外部性（如污染）导致生产过度，因为生产者忽视外部成本；正外部性（如教育）导致生产不足。政府可以通过征税、补贴、监管和提供公共物品等方式进行干预，以纠正市场失灵。
8. Macroeconomic Objectives | 宏观经济目标
Governments typically pursue four main macroeconomic objectives: sustained economic growth, low and stable inflation (usually 2%), low unemployment, and a balanced balance of payments on current account. Additionally, they may aim for an equitable distribution of income and environmental sustainability.
政府通常追求四个主要宏观经济目标：持续的经济增长、低而稳定的通货膨胀（通常为2%）、低失业率，以及国际收支经常账户的平衡。此外，还可能致力于收入公平分配和环境可持续性。
Conflicts may arise between objectives; for example, policies to reduce unemployment might accelerate inflation, and high economic growth could worsen the current account deficit due to increased imports. Policymakers must make trade-offs and prioritise.
目标之间可能存在冲突；例如，降低失业率的政策可能加速通胀，而高经济增长可能因进口增加而恶化经常账户赤字。政策制定者必须进行权衡，确定优先次序。
9. Economic Growth and GDP | 经济增长与GDP
Economic growth is typically measured by the annual percentage increase in real Gross Domestic Product (GDP), which is the total value of all final goods and services produced within a country in a given period, adjusted for inflation. Growth can be achieved through increased factor inputs (land, labour, capital) or improved productivity.
经济增长通常以实际国内生产总值（GDP）的年增长率来衡量，GDP 是一国在特定时期内生产的所有最终商品和服务的总价值，并经过通胀调整。增长可通过增加要素投入（土地、劳动、资本）或提高生产率实现。
Benefits of growth include higher living standards and increased employment, but costs may include inflation, environmental damage, and widening inequality. Sustainable growth aims to balance these trade-offs and ensure future generations' well-being.
经济增长的好处包括生活水平提高和就业增加，但代价可能包括通胀、环境破坏和不平等加剧。可持续增长旨在平衡这些利弊，确保后代福祉。
10. Inflation and Unemployment | 通货膨胀与失业
Inflation is a sustained rise in the general price level, commonly measured by the Consumer Price Index (CPI). It reduces the purchasing power of money. Main causes include demand-pull inflation (excess aggregate demand) and cost-push inflation (rising production costs, such as wages or raw materials).
通货膨胀是指一般物价水平持续上升，通常用消费者价格指数（CPI）衡量。它降低了货币的购买力。主要成因包括需求拉动型通胀（总需求过剩）和成本推动型通胀（生产成本如工资或原材料上升）。
Unemployment refers to people who are willing and able to work but cannot find a job. It is often measured by the unemployment rate. Types include cyclical (demand-deficient), structural, frictional, and seasonal unemployment. High unemployment leads to lost output and social costs.
失业是指愿意并且有能力工作但找不到工作的人。通常以失业率衡量。类型包括周期性（需求不足型）、结构性、摩擦性和季节性失业。高失业会导致产出损失和社会成本。
There is often a short-run trade-off between inflation and unemployment, illustrated by the Phillips Curve. However, in the long run this relationship may break down, and attempts to push unemployment below the natural rate may only accelerate inflation.
通胀与失业之间通常在短期存在权衡取舍关系，由菲利普斯曲线所示。然而，长期中这种关系可能会消失，试图将失业率压低至自然率以下可能只会加速通胀。
11. Fiscal and Monetary Policy | 财政与货币政策
Fiscal policy involves government spending and taxation to influence the economy. Expansionary fiscal policy (increased spending or tax cuts) aims to boost aggregate demand during a recession, while contractionary policy (spending cuts or tax increases) aims to reduce inflationary pressures. The government's budget balance shows the difference between spending and revenue.
财政政策是指政府通过支出和税收来影响经济。扩张性财政政策（增加支出或减税）旨在衰退时刺激总需求，而紧缩性政策（削减支出或增税）旨在减轻通胀压力。政府预算平衡体现了支出与收入的差额。
Monetary policy involves controlling the money supply and interest rates, typically managed by a central bank. Lowering interest rates encourages borrowing and spending, stimulating the economy; raising rates does the opposite to curb inflation. The central bank may also use quantitative easing to increase money supply when rates are near zero.
货币政策涉及控制货币供应和利率，通常由中央银行实施。降低利率会鼓励借贷和消费，刺激经济；提高利率则相反，以抑制通胀。当利率接近零时，央行还可能使用量化宽松来增加货币供给。
12. International Trade and Exchange Rates | 国际贸易与汇率
Countries trade to obtain goods and services they cannot produce efficiently themselves, benefiting from comparative advantage. International trade allows specialization and economies of scale. However, free trade can also lead to job losses in certain domestic industries and trade imbalances. Governments may use protectionist measures such as tariffs, quotas, and subsidies to shield domestic firms.
国家进行贸易是为了获取自身不能高效生产的商品和服务，并从比较优势中获益。国际贸易有助于专业化和规模经济。然而，自由贸易也可能导致某些国内行业的失业和贸易失衡。政府可能使用关税、配额和补贴等保护主义措施来保护本国企业。
The exchange rate is the price of one currency in terms of another. It is determined by supply and demand in the foreign exchange market or by government policy. A stronger currency makes exports more expensive and imports cheaper, potentially worsening the trade balance; a weaker currency has the opposite effect. Exchange rate fluctuations affect inflation, employment, and economic stability.
汇率是一种货币以另一种货币表示的价格。它由外汇市场的供求关系或政府政策决定。货币走强会使出口更贵、进口更便宜，可能恶化贸易平衡；货币走弱则有相反效果。汇率波动会影响通胀、就业和经济稳定。
Published by TutorHao | Economics Revision Series | aleveler.com
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