📚 AQA Year 9 Economics: Vocabulary & Terminology Quick-Memorisation Guide | AQA 9年级经济：词汇术语速记指南
Economics can feel like a foreign language at first, but every term you learn is a key that unlocks a deeper understanding of how the world works. This guide breaks down essential AQA Year 9 vocabulary with simple explanations and memorable tricks – so you can speak ‘econ’ with confidence.
初学经济学就像在学一门全新的语言，但你每掌握一个术语，就等于拿到了一把理解世界如何运转的钥匙。本指南用简单的解释和好记的窍门分解AQA 9年级的核心词汇，帮你自信地说好“经济”这门语言。
1. Scarcity & The Basic Economic Problem | 稀缺性与基本经济问题
Scarcity means that resources are limited while human wants are unlimited. The basic economic problem is: what to produce, how to produce, and for whom to produce. To remember, think of the three questions every society must answer – WHW: What, How, For Whom?
稀缺性是指资源有限而人的欲望无限。基本经济问题是：生产什么、如何生产、为谁生产。记住每个社会都必须回答的三个问题——WHW：What（什么）、How（如何）、For Whom（为谁）。
2. Factors of Production | 生产要素
Resources are grouped into four factors: Land (natural resources), Labour (workers), Capital (man-made tools and machinery), and Enterprise (the risk-taking ability of entrepreneurs). Use the mnemonic C.E.L.L. – Capital, Enterprise, Land, Labour – or picture a pizza: Land is the flour, Labour is the chef, Capital is the oven, Enterprise is the person who sells the pizza.
资源分为四种要素：土地（自然资源）、劳动力（工人）、资本（人造工具和机器）和企业家精神（企业家承担风险的能力）。用助记符C.E.L.L. – Capital（资本）, Enterprise（企业家精神）, Land（土地）, Labour（劳动力），或者想象一个比萨：土地是面粉，劳动力是厨师，资本是烤箱，企业家精神是卖比萨的人。
3. Opportunity Cost | 机会成本
Opportunity cost is the next best alternative given up when a choice is made. If you spend your £10 on a cinema ticket instead of a book, the opportunity cost is the enjoyment you would have got from the book. Link it to "What you sacrifice is what you cost".
机会成本是做出选择时所放弃的次优替代品。如果你花10英镑买电影票而不是一本书，那么机会成本就是那本书带给你的乐趣。把它联想为“你牺牲的就是你的成本”。
4. Needs vs Wants | 需要与欲望
Needs are essential for survival (food, water, shelter), while wants are things we desire but can live without (smartphones, holidays). Memorise with the sentence: Necessities are Needs, Wishes are Wants.
需要是生存所必需的（食物、水、住所），欲望则是我们想要但并非生存必须的东西（智能手机、度假）。用句子记忆：Necessities（必需品）是Needs（需要），Wishes（愿望）是Wants（欲望）。
5. Goods & Services | 商品与服务
Goods are physical, tangible items (like a pen or a car). Services are intangible actions provided for someone else (like a haircut or a concert). Think Goods = Graspable, Services = Someone doing it for you.
商品是有形的实物（如笔或汽车）。服务是为别人提供的无形行为（如理发或音乐会）。联想：Goods（商品）= Graspable（可抓住的），Services（服务）= Someone doing it for you（别人帮你做）。
6. Demand & Supply | 需求与供给
Demand is the quantity of a product consumers are willing and able to buy at various prices. Supply is the quantity producers are willing and able to offer. Use the curve trick: Demand curves slope Down, Supply curves slope Skyward (up).
需求是消费者在不同价格下愿意且能够购买的产品数量。供给是生产者愿意且能够提供的数量。用曲线技巧记忆：Demand（需求）曲线向Down（下）倾斜，Supply（供给）曲线向Skyward（天空/上）倾斜。
7. Equilibrium & Disequilibrium | 均衡与非均衡
Market equilibrium occurs where demand equals supply – there is no shortage or surplus. Disequilibrium is any other price where supply and demand are out of balance. Picture a seesaw balanced flat: Equi = Equal. When it tips, you have dis-equilibrium.
市场均衡出现在需求等于供给之处——没有短缺也没有过剩。非均衡是供需失衡的任何其他价格。想象一个水平平衡的跷跷板：Equi = Equal（相等）。当它倾斜时，就是非均衡。
8. Price Elasticity of Demand (PED) | 需求价格弹性
PED measures how much quantity demanded responds to a change in price. If a small price change causes a big quantity change, demand is elastic. If quantity barely changes, it is inelastic. Formula: PED = % change in quantity demanded ÷ % change in price. Remember: Elastic = Extends a lot, Inelastic = Ignoring the price change.
需求价格弹性衡量需求量对价格变化的反应程度。如果价格小变化引起需求量的大变化，需求是弹性的。如果需求量几乎不变，就是无弹性。公式：PED = 需求量变化百分比 ÷ 价格变化百分比。 记忆：Elastic（弹性）像Extends（伸展）很大，Inelastic（无弹性）像Ignoring（忽略）价格变化。
9. Market Failure | 市场失灵
Market failure happens when the free market does not allocate resources efficiently, leading to a net social loss. Examples include externalities (pollution), public goods (street lighting), and information gaps. Think of it as "Market Fails" when prices don't tell the full story.
市场失灵发生在自由市场未能有效配置资源，导致社会净损失时。例子包括外部性（污染）、公共品（路灯）和信息缺口。将其理解为当价格不能反映全部事实时，“市场就失败了”。
10. Externalities | 外部性
An externality is a cost or benefit that affects a third party who did not choose to incur it. Negative externalities (e.g. noise from a factory) impose costs; positive externalities (e.g. a neighbour's beautiful garden) confer benefits. Negative = Nasty spillover, Positive = Pleasant spillover.
外部性是指影响没有选择承担该影响的第三方的成本或收益。负外部性（如工厂噪音）带来了成本；正外部性（如邻居美丽的花园）带来了好处。Negative（负的）= Nasty spillover（讨厌的溢出），Positive（正的）= Pleasant spillover（愉快的溢出）。
11. Government Intervention | 政府干预
Governments intervene to correct market failure using taxes, subsidies, regulations, and direct provision. Tax to dIscourage (sin taxes), SubsidIes to encouragIe – note the 'I' in both tools associated with influence.
政府通过税收、补贴、法规和直接提供来纠正市场失灵。用税收来抑制（罪恶税），用补贴来鼓励——注意两个工具都带有影响的意思。
12. Gross Domestic Product (GDP) | 国内生产总值
GDP is the total value of all final goods and services produced within a country in a given period. It is the headline measure of economic growth. Remember: GDP = Goods + Domestically Produced.
GDP 是在某一时期内一国境内生产的所有最终商品与服务的总价值，是衡量经济增长的主要指标。记忆：GDP = Goods（商品）+ Domestically（国内）+ Produced（生产）。
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