📚 Mnemonics for Year 13 WJEC Economics Key Terms | Year 13 WJEC 经济：词汇术语速记指南
Mastering the specialist vocabulary of Year 13 Economics is half the battle in the WJEC exam. This bilingual guide groups essential terms by topic and provides memorable shortcuts so you can recall precise definitions under pressure, from the nature of costs and revenues to the complexities of globalisation and development.
掌握 Year 13 经济学的专业词汇是攻克 WJEC 考试的半壁江山。这份双语指南按主题归类关键术语，并提供易记的捷径，帮助你在考试压力下精准回忆定义，从成本与收益的本质到全球化与发展的复杂议题。
1. Costs, Revenues and Business Objectives | 成本、收益与企业目标
Short-run cost families ed Cost (TFC) + Total Variable Cost (TVC). Fixed costs exist even at zero output, so think 'rent is relentless'. Variable costs climb with each extra unit; imagine 'raw material mountains' because of spreading fixed costs then diminishing returns. Marginal cost (MC) cuts AC at its lowest point – 'MC drives AC'.
短期成本家族：总成本(TC)=总固定成本(TFC)+总可变成本(TVC)。固定成本在零产出时依然存在，记住“租金不饶人”。可变成本随每新增一单位而攀升，想象“原材料山脉”。平均成本(AC=TC/Q)因分摊固定成本而先降后因报酬递减而升，呈U形。边际成本(MC)在AC最低点穿过它——“MC驾驭AC”。
Revenue rules ect competition, MR = AR = price. For imperfect markets, MR lies below AR and slopes twice as steeply with linear demand.
收益法则：总收益(TR)=价格×数量。平均收益(AR)就是需求曲线。边际收益(MR)是多卖一单位带来的额外收益。完全竞争下，MR=AR=价格。不完全市场中，MR位于AR下方，且线性需求下MR斜率是AR斜率的两倍。
Business objectives beyond profit normal profit occurs), satisficing, and corporate social responsibility. Use the mnemonic 'PRaSES' – Profit (max), Revenue (max), Sales (max), Satisficing, Environmental/social.
利润以外的企业目标：收益最大化(MR=0)、销量最大化(AC=AR处只有正常利润)、满意化、企业社会责任。记忆口诀“PRaSES”——利润(max)、收益(max)、销售(max)、满意化、环境/社会。
2. Market Structures from Perfect Competition to Monopoly | 市场结构：从完全竞争到垄断
Perfect competition checklist: Many small firms, identical products, perfect knowledge, no barriers to entry/exit, firms are price takers. In the long run only normal profit is made. Think 'MIPPI' – Many, Identical, Perfect info, Price taker, Immediate exit.
完全竞争核对清单：众多小企业、同质产品、完全信息、无进出壁垒、企业是价格接受者。长期只能获得正常利润。记住“MIPPI”——许多、同质、完美信息、价格接受、即时退出。
Monopolistic competition: Many firms, differentiated products, low barriers, some price-setting power. Short-run supernormal profit attracts entrants, eroding profit to normal in the long run. The key is product differentiation and non-price competition.
垄断竞争：许多企业，产品差异化，低壁垒，一定定价权。短期超额利润吸引进入，长期利润被侵蚀至正常水平。核心是产品差异化和非价格竞争。
Oligopoly: Few interdependent firms, high concentration ratio, barriers to entry. Kinked demand curve model explains price rigidity. Collusion can be overt (cartel) or tacit (price leadership). Game theory’s prisoners’ dilemma shows incentive to cheat.
寡头垄断：少数相互依存的企业，高集中度，进入壁垒。弯折的需求曲线模型解释价格刚性。合谋可以是公开的（卡特尔）或默契的（价格领导）。博弈论中的囚徒困境说明背叛的动机。
Monopoly: Single seller, high barriers, price maker. Can earn supernormal profit in long run. Faces downward-sloping demand and can price discriminate if conditions are met. Efficiency concerns: allocatively inefficient (P>MC), productively inefficient unless forced.
垄断：单一卖者，高壁垒，价格制定者。长期可获超额利润。面临向下倾斜的需求曲线，条件满足可实行价格歧视。效率担忧：配置无效率(P>MC)，除非被迫否则生产无效率。
3. Labour Market Terminology | 劳动力市场术语
Marginal Revenue Product (MRP) theory RP = wage rate. The demand for labour is derived from the demand for the product. Remember 'MPP × MR = MRP determines demand'.
边际收益产品(MRP)理论：MRP=边际实物产量×边际收益。企业雇佣劳动直至MRP=工资率。劳动需求是引致需求，源于产品需求。记住“MPP×MR=MRP决定需求”。
Elasticity of labour demand: Determined by ease of substitution between capital and labour, elasticity of product demand, labour’s share of total costs, and time period. High product demand elasticity makes labour demand more elastic.
劳动需求弹性：取决于资本与劳动的替代难易度、产品需求弹性、劳动占总成本比重以及时间长短。产品需求弹性高则劳动需求更富弹性。
Wage differentials: Explained by MRP differences, human capital, discrimination, trade union power, monopsony employers, and compensating wage differentials for unpleasant jobs. Mnemonic: 'SHuT DC' – Skills/Human capital, Trade unions, Discrimination, Compensating differentials.
工资差异：由MRP差异、人力资本、歧视、工会力量、买方垄断雇主以及不愉快工作的补偿性工资差异解释。记忆“SHuT DC”——技能/人力资本、工会、歧视、补偿性差异。
Monopsony the supply curve. Employs where MRP = MCL, paying a wage below MRP. This exploits workers.
买方垄断：单一劳动购买者具有工资设定权。为了雇佣更多必须提高所有人的工资，因此劳动边际成本(MCL)高于供给曲线。在MRP=MCL处雇佣，支付低于MRP的工资，剥削工人。
4. Macroeconomic Objectives and Measures | 宏观经济目标与度量
The magic four: Economic growth (real GDP growth), low unemployment, low and stable inflation (CPI 2% target), balance of payments equilibrium on current account. Think 'GULF' – Growth, Unemployment, Low inflation, external balance (Foreign trade).
神奇四目标：经济增长（实际GDP增长）、低失业、低而稳定的通胀（CPI 2%目标）、经常账户的国际收支平衡。记住“GULF”——增长、失业、低通胀、外贸平衡。
GDP and GNI: GDP is the value of output produced within an economy. GNI is GDP plus net income from abroad. Real GDP strips out inflation. GDP per capita divides by population. Use 'GDP is domestic, GNI includes Net income from abroad'.
GDP与GNI：GDP是一经济体内部生产的产出价值。GNI是GDP加净海外收入。实际GDP剔除通胀。人均GDP除以人口。记“GDP本土，GNI含净国外收入”。
Unemployment measures nemployed/labour force) × 100. Types: cyclical, structural, frictional, seasonal. Mnemonic 'Cyclical Structure Friction Season' – CSFS.
失业度量：申领人数与ILO劳动力调查。劳动力为就业者加失业者。失业率=(失业人数/劳动力)×100。类型：周期性、结构性、摩擦性、季节性。记忆“周期性结构性摩擦季节性”——CSFS。
Inflation indices: Consumer Price Index (CPI) and Retail Price Index (RPI). Deflation is negative inflation; disinflation is a fall in the inflation rate. Demand-pull and cost-push are the two main triggers.
通胀指数：消费者价格指数(CPI)与零售价格指数(RPI)。通缩是负通胀；通胀回落是通胀率下降。需求拉动与成本推动是两大诱因。
5. Aggregate Demand and Aggregate Supply | 总需求与总供给
AD components estment, Government spending, Net exports. A shift in AD comes from changes in these components. Mnemonic 'CIG-X' (say 'cig-ex') where X is net exports.
AD构成：AD = C + I + G + (X-M)：消费、投资、政府支出、净出口。AD移动源于这些分量变化。口诀“CIG-X”（读作“cig-ex”），X表示净出口。
Short-run AS (SRAS): Upward-sloping because of sticky wages or misperceptions. Shifts come from changes in costs: wages, raw materials, taxes, exchange rates affecting import costs. 'WRITE' – Wages, Raw materials, Indirect taxes, exchange rate, Efficiency/technology.
短期总供给(SRAS)：向上倾斜，因工资粘性或错觉。移动来自成本变化：工资、原材料、税收、影响进口成本的汇率。口诀“WRITE”——工资(W)、原材料(R)、间接税(I)、汇率(exchange Rate)、技术/效率(TE)。
Long-run AS (LRAS): Vertical at full capacity, determined by quantity/quality of factors and productivity. Classical LRAS gives vertical; Keynesian LRAS has horizontal then upward-sloping then vertical segments. Shifts right with improvements in land, labour, capital, entrepreneurship.
长期总供给(LRAS)：在充分产能处垂直，由要素数量/质量及生产力决定。古典LRAS垂直；凯恩斯LRAS先水平后倾斜再垂直。随着土地、劳动、资本、企业才能的改进向右移动。
Sustainable output gap terms: Positive output gap (actual > potential, inflationary pressure), negative output gap (actual < potential, spare capacity, unemployment). Close gaps using demand-side or supply-side policies.
可持续产出缺口术语：正产出缺口（实际>潜在，通胀压力），负产出缺口（实际<潜在，闲置产能，失业）。用需求侧或供给侧政策关闭缺口。
6. Fiscal and Monetary Policy Tools | 财政与货币政策工具
Fiscal stance: Expansionary (lower taxes, higher spending) to boost AD; contractionary (higher taxes, lower spending) to cool the economy. Automatic stabilisers: progressive taxes and welfare benefits kick in without new legislation.
财政态势：扩张性（减税、增支出）以提振AD；紧缩性（增税、减支出）为经济降温。自动稳定器：累进税与福利发放无需新立法即自动生效。
National debt vs deficit: Deficit is when government spending exceeds tax revenue in one year. National debt is the cumulative total of past deficits. Think 'deficit is a flow, debt is a stock'.
国债与赤字：赤字是一年中政府支出超过税收。国债是历年赤字的累计总和。记“赤字是流量，债务是存量”。
Monetary policy instruments: Interest rate (Bank Rate), quantitative easing (QE – central bank buys government bonds to inject liquidity), forward guidance. The transmission mechanism: rate change affects borrowing, saving, asset prices, exchange rate, then AD and inflation.
货币政策工具：利率（银行利率）、量化宽松（QE——央行购买国债注入流动性）、前瞻指引。传导机制：利率变化影响借贷、储蓄、资产价格、汇率，进而影响AD与通胀。
Money supply growth rules y supply, V is velocity, P is price level, T is transactions. Monetarists believe V is stable, so money supply growth drives inflation.
货币供给增长规则：广义货币(M4)与狭义货币。费雪方程式MV=PT，M为货币供给，V为流通速度，P为价格水平，T为交易量。货币主义者相信V稳定，故货币供给增长导致通胀。
7. International Trade and Exchange Rates | 国际贸易与汇率
Comparative advantage s from trade arise even if one country is absolutely better at everything, as long as opportunity costs differ. Mnemonic 'COMP OPP' – Comparative = Opportunity cost lowest.
比较优势：国家应专业化生产机会成本最低的商品。不是绝对优势（单位工人产出更多）。只要机会成本不同，即使一国在所有方面绝对更优，贸易仍能获利。记忆“COMP OPP”——比较=机会成本最低。
Terms of trade rade means a country can buy more imports for a given quantity of exports. Factors: exchange rates, inflation, productivity, commodity prices.
贸易条件：出口价格相对于进口价格指数×100。贸易条件上升意味着一国用给定出口量可买到更多进口。影响因素：汇率、通胀、生产力、大宗商品价格。
Exchange rate systems: Floating (determined by market forces of demand/supply for currency), fixed (pegged by central bank intervention), managed float (dirty float with some intervention). Appreciation/depreciation for floating; revaluation/devaluation for fixed.
汇率制度：浮动（由市场对货币的供需决定）、固定（央行干预钉住）、管理浮动（肮脏浮动伴随干预）。浮动下为升值/贬值；固定下为法定升值/法定贬值。
Balance of payments components: Current account (trade in goods, services, primary and secondary income), Capital account, Financial account (FDI, portfolio investment, reserves). Always balances because of double-entry bookkeeping. Current account deficit must be matched by financial account surplus.
国际收支构成：经常账户（货物贸易、服务、初次与二次收入）、资本账户、金融账户（FDI、证券投资、储备资产）。因复式记账法始终平衡。经常账户逆差必对应金融账户顺差。
8. Globalisation and Development Economics | 全球化与发展经济学
Globalisation characteristics: Increased trade as % of GDP, freer capital flows, migration, spread of technology, cultural convergence. Drivers: containerisation, ICT, trade liberalisation, MNCs. Use 'TIMC' – Trade, Investment, Migration, Culture/technology.
全球化特征：贸易占GDP比重上升、资本自由流动、移民、技术扩散、文化趋同。驱动因素：集装箱化、ICT、贸易自由化、跨国公司。用“TIMC”——贸易、投资、移民、文化/技术。
Human Development Index (HDI): Composite of life expectancy at birth, mean and expected years of schooling, and GNI per capita (PPP). Better than GDP alone because it captures health and education. Remember 'HLE' – Health (life expectancy), Learning (schooling), Earnings (GNI).
人类发展指数(HDI)：由出生时预期寿命、平均与预期受教育年限、人均GNI（PPP）合成的指标。优于仅看GDP，因其涵盖健康与教育。记住“HLE”——健康（寿命）、学习（教育）、收入（GNI）。
Trade strategies vs aid: Export-led growth (e.g. East Asian Tigers), import substitution (protection of infant industries). Aid: bilateral, multilateral, tied, project aid. Debt relief and microfinance as alternative development paths.
贸易战略与援助：出口导向型增长（如东亚四小龙）、进口替代（保护幼稚产业）。援助：双边、多边、捆绑、项目援助。债务减免与小微信贷作为替代发展路径。
Barriers to development e poverty cycle: low income → low saving → low investment → low productivity → low income.
发展障碍：初级产品依赖、储蓄缺口、外汇缺口（双缺口模型）、腐败、治理不善、债务积压。贫困恶性循环：低收入→低储蓄→低投资→低生产率→低收入。
9. Market Failure and Government Intervention | 市场失灵与政府干预
Externalities refined: Negative production externality (MSC > MPC), positive consumption externality (MSB > MPB). Pigouvian taxes aim to internalise the externality. Carbon permit trading sets a quantity cap and lets the price of permits emerge.
外部性细化：负生产外部性(MSC > MPC)，正消费外部性(MSB > MPB)。庇古税旨在内在化外部性。碳排放权交易设定数量上限，让许可证价格形成。
Public goods & free rider problem: Non-excludable and non-rival. Private sector under-provides because of free riders. Government provision corrected via taxation. 'NER' – Non-Excludable, Non-Rival remember.
公共品与搭便车问题：非排他且非竞争。因搭便车者私人部门供给不足。通过税收由政府提供纠正。记“NER”——非排他、非竞争。
Information asymmetries: Adverse selection (before transaction, e.g. used cars) and moral hazard (after transaction, e.g. insured taking more risks). Solutions: screening, signalling, warranties.
信息不对称：逆向选择（交易前，如二手车）与道德风险（交易后，如被保险人冒更多风险）。解决办法：筛选、发信号、担保。
Government failure: When intervention worsens allocation of resources. Causes: imperfect information, political self-interest, regulatory capture, unintended consequences. Net welfare loss can exceed original market failure.
政府失灵：当干预恶化资源配置时。原因：不完美信息、政治私利、监管俘获、意外后果。净福利损失可能超过初始市场失灵。
10. Quick-Fire Contradistinctions and Mnemonic Pairs | 概念辨析与速记配对
Short run vs Long run: Short run: at least one factor fixed. Long run: all factors variable. In macro, short run (sticky wages), long run (flexible prices/wages).
短期与长期：短期：至少一种要素固定。长期：所有要素可变。宏观中，短期（工资粘性），长期（价格/工资灵活）。
Economic growth vs Economic development: Growth is rise in real GDP. Development is wider measure including HDI, living standards, sustainability. Growth is quantitative; development is qualitative.
经济增长与经济发展：增长是实际GDP提高。发展是更广泛衡量，包括HDI、生活水平、可持续性。增长是量变；发展是质变。
Direct tax vs Indirect tax: Direct on income/wealth (income tax, corporation tax, capital gains). Indirect on spending (VAT, excise duties). Progressive, regressive, proportional tax structures.
直接税与间接税：直接针对收入/财富（所得税、公司税、资本利得税）。间接针对支出（增值税、消费税）。累进税、累退税、比例税结构。
Price discrimination degrees: 1st degree (perfect, each consumer charged maximum willingness to pay), 2nd degree (based on quantity/versions), 3rd degree (market segmentation, e.g. age, time). Conditions: monopoly power, no resale, separable markets with different elasticities.
价格歧视程度：一级（完美，每位消费者收最高支付意愿），二级（根据数量/版本），三级（市场细分，如年龄、时间）。条件：垄断力、禁止转售、不同弹性可区分市场。
Nominal vs Real values t : Nominal is at current prices. Real is adjusted for inflation, reflecting true purchasing power. Always 'Real = Nominal deflated'. A money illusion is when people mistake nominal increases for real gains.
名义值与实际值：名义按当期价格。实际经通胀调整，反映真实购买力。牢记“实际=名义剔通胀”。货币幻觉是误将名义增长当成实际收益。
11. Tricky Paired Terms in Macro Policy | 宏观政策易混术语配对
Revaluation vs Appreciation: Revaluation is a deliberate government action in a fixed exchange rate system to raise the currency's value. Appreciation is a market-driven rise in a floating system.
法定升值与升值：法定升值是固定汇率制度下政府有意提高货币价值的行动。升值是浮动制度下市场驱动的上升。
Budget deficit vs Cyclical deficit: The overall deficit may include a cyclical component (due to the economy operating below potential). Structural deficit is the deficit that would exist at full employment. Disaggregate when analysing fiscal stance.
预算赤字与周期性赤字：总赤字可能包含周期性成分（源于经济在潜在水平下运行）。结构性赤字是充分就业时仍存在的赤字。分析财政态势时应分解。
Crowding out vs Crowding in: Crowding out is when increased government spending raises interest rates and reduces private investment. Crowding in is when government investment stimulates private investment through improved infrastructure. Essential debate for fiscal multiplier.
挤出与挤入：挤出是政府支出增加推高利率从而减少私人投资。挤入是政府投资通过改善基础设施刺激私人投资。这是财政乘数的核心争论。
Hot money flows: Short-term capital flows moving internationally to take advantage of interest rate differentials. Can cause exchange rate volatility and complicate monetary policy independence (the 'impossible trinity').
热钱流动：为套取利差而国际流动的短期资本。可造成汇率波动并使货币政策独立性复杂化（“不可能三角”）。
12. Memory Palace for the Final Review | 终极复习记忆宫殿
Place each major topic in a room of your imaginary house. Walk through cost/revenue in the kitchen (raw materials, appliances as fixed capital), market structures in the living room (different sizes of furniture representing number of firms), policies in the study (fiscal desk, monetary laptop). Associate terms with vivid, silly imagery: a 'kinked demand curve' as a broken ruler, 'quantitative easing' as a tap pouring money into a bathtub. Recalling the journey retrieves the definitions.
把每个主要主题放入你想象中房子的一个房间。在厨房走过成本/收益（原材料、电器视为固定资本），在客厅放置市场结构（不同尺寸的家具代表企业数量），在书房安排政策（财政书桌、货币笔记本电脑）。用生动离奇的图像联系术语：“弯折的需求曲线”是一根折断的尺子，“量化宽松”是一个水龙头往浴缸倒钱。回忆这个旅程就能检索定义。
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