📚 IB WJEC Economics: End-of-Term Revision Guide | IB WJEC 经济：期末复习提纲
This revision guide brings together the core topics of IB Economics with the focused, exam-style approach of the WJEC specification. Whether you are consolidating micro and macro theory or sharpening your data response and evaluation skills, the following sections cover the essential knowledge and common pitfalls. Each point is presented in paired English and Chinese paragraphs to support bilingual learners and ensure clarity.
本复习提纲融合了 IB 经济学的核心主题与 WJEC 考试局所侧重的应试风格。无论你是在巩固微观和宏观理论，还是提升数据分析与评价能力，以下各节均涵盖必备知识与常见误区。每项要点均以英文与中文成对呈现，帮助双语学习者清晰理解。
1. Microeconomics: Demand, Supply, and Elasticity | 微观经济学：需求、供给与弹性
The law of demand states that, ceteris paribus, as the price of a good rises, the quantity demanded falls. This inverse relationship is explained by the income and substitution effects.
需求定律指出，在其他条件不变的情况下，商品价格上升会导致需求量下降。这一反向关系可由收入效应和替代效应解释。
Non‑price determinants of demand include changes in income (normal vs inferior goods), tastes, prices of related goods (substitutes and complements), and expectations. A shift of the entire demand curve must be distinguished from a movement along it.
需求的非价格决定因素包括收入变化（正常品与劣等品）、偏好、相关商品价格（替代品和互补品）以及预期。必须区分整条需求曲线的移动与沿着曲线的移动。
Supply reflects producers' willingness to sell at each price, and its main determinants are costs of production, technology, taxes, subsidies, and the number of sellers. The supply curve typically slopes upward because higher prices increase profitability.
供给反映生产者在每个价格下的销售意愿，其主要决定因素包括生产成本、技术、税收、补贴以及市场中的卖家数量。供给曲线通常向右上方倾斜，因为价格上升会提高获利能力。
of demand (PED) measures the responsiveness of quantity demanded to a price change: PED = %ΔQd ÷ % stic, while those with PED < 1 are inelastic. Firms use PED to predict revenue changes.
需求价格弹性（PED）衡量需求量对价格变动的反应程度：PED = %ΔQd ÷ %ΔP。PED 大于 1 为富有弹性，小于 1 为缺乏弹性。企业利用 PED 预测总收入变动。
Income elasticity (YED) and cross‑price elasticity (XED) further classify goods as normal, inferior, substitutes, or complements. Price elasticity of supply (PES) depends on time and spare capacity.
收入弹性（YED）和交叉价格弹性（XED）进一步将商品分为正常品、劣等品、替代品或互补品。供给价格弹性（PES）取决于时间长短和闲置产能。
2. Government Intervention and Market Failure | 政府干预与市场失灵
Market failure occurs when the free market leads to a misallocation of resources. Key sources include negative externalities (e.g. pollution), positive externalities (e.g. education), public goods, and information asymmetry.
当自由市场导致资源配置扭曲时便出现市场失灵。主要来源有负外部性（如污染）、正外部性（如教育）、公共品以及信息不对称。
In the case of a negative production externality, the marginal social cost (MSC) exceeds the marginal private cost (MPC), resulting in over‑production. A Pigouvian tax equal to the external cost internalises the externality and moves output to the socially efficient level.
在负生产外部性情况下，边际社会成本（MSC）大于边际私人成本（MPC），导致过度生产。相当于外部成本的庇古税将外部性内化，使产量回归社会有效水平。
Positive consumption externalities lead to under‑consumption, as private benefit is lower than social benefit. A subsidy that reduces the price to consumers can increase consumption to the socially optimum level.
正消费外部性导致消费不足，因为私人收益低于社会收益。通过补贴降低消费者价格，可将消费量提升至社会最优水平。
Public goods are non‑rivalrous and non‑excludable, which creates a free‑rider problem. Direct government provision financed by taxation is often required. Information asymmetry can be addressed through regulation, labelling, or licensing.
公共品具有非竞争性和非排他性，由此产生搭便车问题，通常需要政府通过税收直接提供。信息不对称可通过法规、标签或许可制度加以解决。
Critics of intervention highlight government failure: poor information, bureaucracy, and unintended consequences. For high marks in WJEC‑style exams, always evaluate both the intended and unintended effects of any policy.
对干预的批评则强调政府失灵：信息不足、官僚主义以及意外后果。若想在 WJEC 考试中获取高分，务必评价任何政策的预期效果与意外效果。
3. Macroeconomics: Key Indicators and the AD/AS Model | 宏观经济学：关键指标与 AD/AS 模型
Gross Domestic Product (GDP) measures the total value of final goods and services produced within an economy. Real GDP adjusts for inflation; GDP per capita gives a rough indication of living standards.
国内生产总值（GDP）衡量一经济体内部最终商品与服务的总价值。实际 GDP 剔除了通胀影响；人均 GDP 粗略反映生活水平。
Inflation, a sustained rise in the general price level, is measured by the Consumer Price Index (CPI). Deflation and disinflation are distinct concepts and carry different policy implications.
通货膨胀是价格总水平的持续上升，用消费者物价指数（CPI）衡量。通货紧缩与反通货膨胀是不同的概念，具有相异的政策含义。
Unemployment rates reveal unused labour resources. Cyclical unemployment arises from a lack of aggregate demand, while structural and frictional unemployment reflect supply‑side mismatches.
失业率显示未使用的劳动力资源。周期性失业源于总需求不足，而结构性失业和摩擦性失业则反映供给侧的不匹配。
The AD/AS model is the central analytical tool. Aggregate demand (AD) comprises consumption, investment, government spending, and net exports. A fall in any component shifts AD leftward, reducing real output and the price level.
AD/AS 模型是核心分析工具。总需求（AD）由消费、投资、政府支出和净出口构成。任何组成部分的减少都会使 AD 曲线左移，降低实际产出与价格水平。
The short‑run aggregate supply curve (SRAS) is upward sloping due to sticky wages or fixed factor costs. Long‑run aggregate supply (LRAS) represents the economy's productive capacity and can shift outward through improvements in technology and productivity.
短期总供给曲线（SRAS）因工资粘性或固定要素成本而向右上方倾斜。长期总供给（LRAS）代表经济的生产能力，可通过技术进步和生产率的提高向外移动。
4. Fiscal and Monetary Policy | 财政政策与货币政策
Fiscal policy uses government spending and taxation to influence aggregate demand. An expansionary fiscal stance—higher spending or lower taxes—aims to close a deflationary gap, while contractionary policy fights demand‑pull inflation.
财政政策利用政府支出与税收影响总需求。扩张性财政立场（增加支出或减税）旨在消除通缩缺口，而紧缩性政策则对抗需求拉动型通胀。
Automatic stabilisers, such as progressive tax systems and unemployment benefits, operate without explicit government action. Discretionary fiscal changes require legislation and are often subject to time lags.
自动稳定器，如累进税制和失业救济金，无需额外的政府干预即可发挥作用。相机抉择的财政变动则需立法，且常存在时滞。
Monetary policy, conducted by a central bank, primarily manipulates interest rates or the money supply. Lowering the policy rate reduces the cost of borrowing and encourages consumption and investment.
货币政策由中央银行执行，主要通过调节利率或货币供给实现。下调政策利率可降低借贷成本，鼓励消费与投资。
Quantitative easing (QE) involves the central bank purchasing government bonds to inject liquidity and lower long‑term yields. WJEC examiners look for a discussion of the transmission mechanism and the limits of policy at the zero lower bound.
量化宽松（QE）是指央行购买政府债券以注入流动性并压低长期收益率。WJEC 考官希望看到对传导机制以及零利率下限政策局限性的讨论。
Supply‑side policies focus on expanding productive potential: education, training, deregulation, and tax reforms can shift LRAS rightward, enabling non‑inflationary growth.
供给侧政策侧重扩大生产潜力：教育、培训、放松管制和税收改革可推动 LRAS 右移，实现无通胀的增长。
5. International Economics: Trade and Protectionism | 国际经济学：贸易与保护主义
The theory of comparative advantage, developed by Ricardo, demonstrates that countries gain from specialisation even when one has an absolute advantage in all goods. The key is the opportunity cost ratio.
李嘉图提出的比较优势理论表明，即使一国在所有商品上均具绝对优势，参与专门化生产仍可获益，关键在于机会成本比率。
Welfare gains from trade arise through increased consumer choice, lower prices, and the transfer of technology. Yet the static and dynamic gains must be weighed against rising structural unemployment and import dependency.
贸易带来的福利增益表现为消费者选择增加、价格下降和技术转移。但静态与动态收益需与结构性失业和进口依赖的上升相权衡。
Protectionism takes the form of tariffs, subsidies, quotas, and non‑tariff barriers. A tariff raises the domestic price, generates government revenue, and reduces imports; however, it generates deadweight welfare loss.
保护主义的形式有关税、补贴、配额和非关税壁垒。关税抬高国内价格、增加政府收入并减少进口，但会造成无谓福利损失。
Arguments for protection include infant industry, anti‑dumping, national security, and employment protection. In essays, always evaluate the long‑run efficiency costs of these measures.
支持保护的理由包括幼稚产业、反倾销、国家安全和就业保护。在论文中，务必评价这些措施的长期效率成本。
The terms of trade measure the ratio of export prices to import prices. An improvement raises living standards; a deterioration may reflect falling export prices or rising import costs, with important implications for developing nations.
贸易条件衡量出口价格与进口价格之比。贸易条件改善可提升生活水平；恶化则可能反映出口价格下跌或进口成本上升，对发展中国家影响重大。
6. Exchange Rates and Balance of Payments | 汇率与国际收支
An exchange rate is the price of one currency in terms of another. Under a floating system, the rate is determined by demand and supply arising from trade flows, interest rate differentials, and speculation.
汇率是一种货币以另一种货币表示的价格。在浮动制度下，汇率由贸易流动、利差和投机带来的供需决定。
A depreciation makes exports cheaper and imports dearer. The Marshall‑Lerner condition states that a currency depreciation will improve the current account only if the sum of the price elasticities of demand for exports and imports exceeds one.
货币贬值使出口更便宜、进口更昂贵。马歇尔‑勒纳条件指出，只有当进出口需求价格弹性之和大于 1 时，货币贬值才能改善经常账户。
The balance of payments records all transactions between residents and the rest of the world. The current account covers trade in goods and services, primary income, and secondary income. Persistent deficits may indicate structural uncompetitiveness.
国际收支记录了一国居民与世界其他地区的所有交易。经常账户涵盖货物与服务贸易、初次收入及二次收入。持续赤字可能表明结构性竞争力不足。
Fixed exchange rate systems require central bank intervention and holding of foreign reserves. Managed floats combine a market‑determined rate with occasional official intervention to reduce volatility.
固定汇率制度要求中央银行进行干预并持有外汇储备。有管理的浮动汇率制度则将市场决定与偶尔的官方干预相结合，以降低波动性。
The J‑curve effect explains why a trade balance may initially worsen following a depreciation, before improving, due to pre‑existing contracts and low short‑term elasticities.
J 曲线效应解释了为何货币贬值后，贸易余额可能由于既有合同和短期低弹性而先恶化后改善。
7. Development Economics: Growth, Inequality, and Aid | 发展经济学：增长、不平等与援助
Economic growth, measured by increases in real GDP, is a necessary but not sufficient condition for development. The Human Development Index (HDI) incorporates income, health, and education to give a broader picture.
经济增长以实际 GDP 的增长来衡量，是发展的必要条件但不是充分条件。人类发展指数（HDI）融合收入、健康与教育，提供更全面的图景。
Common barriers to development include low savings, weak institutions, high population growth, primary product dependency, and high levels of indebtedness. Breaking these cycles requires a multifaceted strategy.
常见的发展障碍包括低储蓄、薄弱的制度、高人口增长、初级产品依赖以及高负债水平。打破这些循环需要多管齐下的策略。
Inequality within a country can be measured by the Lorenz curve and Gini coefficient. Extreme inequality can hinder growth by limiting access to education and credit, and by fuelling social instability.
国内的不平等可用洛伦兹曲线和基尼系数衡量。极端不平等会限制人们获得教育和信贷的机会，并加剧社会不稳定，从而阻碍增长。
Trade liberalisation offers an outward‑oriented growth strategy: countries take advantage of export‑led growth. However, some argue for import‑substitution industrialisation to protect domestic industries until they become competitive.
贸易自由化提供了一种外向型增长策略：各国借助出口导向型增长获利。但一些人主张采取进口替代工业化，在幼稚产业具备竞争力之前给予保护。
Foreign aid, debt relief, and microfinance are important components of development policy. Effective aid requires good governance and alignment with local needs, while tied aid and corruption often dilute its impact.
对外援助、债务减免和小额信贷是发展政策的重要组成部分。有效的援助需要善治并与当地需求对接，而附带条件的援助及腐败往往会削弱其作用。
8. Exam Techniques and Evaluation Skills | 考试技巧与评价能力
IB and WJEC high‑mark questions demand evaluation, not just description. Use a structured approach such as CLASPP: Conclusion, Long vs short run, Assumptions, Stakeholders, Priorities, Pros and cons.
IB 与 WJEC 的高分题目要求评价而非单纯描述。可使用 CLASPP 等结构化方法：结论、长期与短期、假设、利益相关者、优先次序、正反两面。
Always state the significance of your analytical points. For example, a tax might internalise an externality, but its effectiveness depends on the PED and PES, the ability to measure the true external cost, and the administrative burden.
始终阐述分析要点的意义。例如，税收可将外部性内在化，但其有效性取决于 PED 和 PES、衡量真实外部成本的能力以及行政成本。
In data response tasks, begin by defining the key terms in the question, then apply diagrams and extract precise figures from the text. Link every reference back to the economic theory being tested.
回答数据分析题时，先界定题目中的关键词，然后运用图表并从材料中提取精确数据。每个引用都要与所考的经济理论联系起来。
For essay questions, plan a coherent argument. A typical structure: introduction with definitions, analysis with diagrams, evaluation paragraph(s), and a justified conclusion. Avoid simply listing points—build a chain of reasoning.
对于论文题，需规划连贯的论证。典型结构包括：包含定义的引言、附有图表的分析段落、评价段落以及有理由支撑的结论。避免只罗列要点——要构建一条逻辑推理链。
9. Diagrams and Data Response | 图表与数据分析
Accurate, fully labelled diagrams are essential. Key diagrams include: market equilibrium shifts, negative and positive externality graphs, AD/AS model, tariff diagram, Lorenz curve, and exchange rate determination.
准确且标注完整的图表至关重要。关键图表包括：市场均衡移动、负外部性与正外部性图示、AD/AS 模型、关税图示、洛伦兹曲线以及汇率决定图。
When drawing an externality diagram, clearly show MSC, MPC, MSB, MPB, the socially efficient point, and the welfare loss triangle. Use arrows to indicate shifts and label axes with real‑world units where possible.
绘制外部性图示时，务必清晰标示 MSC、MPC、MSB、MPB、社会有效点以及无谓损失三角形。用箭头表示移动，并尽可能用现实世界中的单位标注坐标轴。
( (New−Old)/Old × 100 ), identifying trends, and explaining causes using economic theory.
数据分析题常提供反映经济指标的数据表格或图表。请练习快速计算百分比变化 ( (新值−旧值)/旧值 × 100 )，识别趋势，并运用经济理论解释成因。
Use the data to support your evaluation: for instance, if the data show a widening current account deficit despite a depreciation, this could be evidence of the J‑curve or low elasticities.
利用数据支撑你的评价：例如，若数据显示尽管货币贬值，经常账户赤字仍在扩大，这可能就是 J 曲线效应或低弹性的证据。
10. Common Mistakes and Revision Strategies | 常见错误与复习策略
One of the most frequent errors is confusing movements along a curve with shifts of the curve. Always check whether the change is driven by price (movement) or by a non‑price determinant (shift).
最常见的错误之一是混淆曲线上的移动与曲线的移动。务必检查变化是由价格（引起移动）还是由非价格决定因素（引起移动）驱动。
In macroeconomics, students often neglect the multiplier or the role of spare capacity when evaluating the impact of fiscal policy. Use the multiplier formula to quantify the potential effect on national income.
在宏观经济学中，学生评价财政政策影响时常常忽略乘数或闲置产能的作用。应使用乘数公式量化对国民收入的潜在影响。
Neglecting units on diagrams and forgetting to label curves as AD₂ or S₁ are easy marks lost. Develop a checklist: title, axes labels, origin, intersection, new curves, and welfare areas.
图表中遗漏单位以及忘记将曲线标注为 AD₂ 或 S₁ 等，都是容易丢分的地方。可以制作一份核对清单：标题、坐标轴标签、原点、交点、新曲线和福利区域。
Active revision techniques—teaching a topic to a friend, creating mind‑maps, and practising past‑paper questions under timed conditions—are far more effective than passive reading. Schedule short, frequent sessions.
主动复习方法——如给朋友讲解某个主题、制作思维导图、限时练习历年真题——远比被动阅读有效。请安排短时间、高频率的复习环节。
Finally, embed evaluation throughout your answers rather than leaving it to the end. A single sentence that considers alternative perspectives or the role of ceteris paribus assumptions can lift a response into the top mark band.
最后，将评价融入答案始终，而非留到最后才写。只需用一句话考虑替代视角或“其他条件不变”假设的作用，便可将答案提升至最高档分数。
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