📚 Year 9 WJEC Economics: Key Vocabulary & Memory Hacks | 九年级 WJEC 经济学：关键术语速记指南
Mastering the language of Economics is like learning a new game: once you grasp the rules and key terms, everything else clicks into place. For Year 9 students starting the WJEC course, building a solid vocabulary foundation is the single most powerful step towards exam success. This guide breaks down essential economic terms into clear definitions and pairs them with simple memory tricks to help you recall them with confidence.
掌握经济学的语言就像学习一种新游戏：一旦你掌握了规则和关键术语，其他一切都会豁然开朗。对于开始学习 WJEC 课程的九年级学生来说，建立扎实的词汇基础是走向考试成功最有力的一步。这份指南将基本的经济学术语拆解为清晰的定义，并配以简单的记忆技巧，帮助你自信地回忆起它们。
1. The Basic Economic Problem | 基本经济问题
The basic economic problem arises because people have unlimited wants but resources are finite. We can never have everything we desire, so every society must decide what to produce, how to produce it, and for whom to produce it. These three fundamental questions form the core of economic decision-making.
基本经济问题的产生是因为人们的欲望是无限的，但资源是有限的。我们永远无法拥有我们想要的一切，因此每个社会都必须决定生产什么、如何生产以及为谁生产。这三个根本问题构成了经济决策的核心。
Memory hack: Think of a pizza shop with only one oven — the 'Wants vs. Limits' dilemma. Unlimited toppings orders mean choices must be made.
记忆技巧：想象一个只有一个烤箱的比萨店——这就是“欲望与限制”的两难境地。无限的配料订单意味着必须做出选择。
2. Scarcity and Choice | 稀缺性与选择
Scarcity means there is not enough of a resource to satisfy all our wants at a given price. Because of scarcity, we must make choices. Every choice involves giving something up. This is not the same as a shortage; scarcity is a permanent condition caused by limited resources compared to infinite desires.
稀缺性意味着在给定价格下，资源不足以满足我们所有的欲望。由于稀缺性，我们必须做出选择。每一个选择都涉及放弃某些东西。这不同于短缺；稀缺性是由于有限资源相对于无限欲望而产生的永久状态。
Memory hack: Use 'S-C-A-R-C-E' — 'Some Choices Always Require Cutting Enjoyables'. This reminds you that scarcity forces sacrifice.
记忆技巧：使用“S-C-A-R-C-E”——“一些选择总是需要削减享受”。这提醒你稀缺性迫使你做出牺牲。
3. Opportunity Cost | 机会成本
Opportunity cost is the value of the next best alternative that you give up when making a choice. It is not everything you forgo, only the most desirable option you miss out on. For a student, the opportunity cost of attending a party might be the grade you lose from not revising for a test.
机会成本是你做出选择时所放弃的次优替代品的价值。它不是你所放弃的一切，只是你错失的最想要的那个选项。对于一个学生来说，参加派对的机会成本可能就是你不复习考试所失去的分数。
Memory hack: Picture a 'COST gate' where you must give up your next favourite thing to pass through. The 'gate' reminds you that every choice has a price tag labelled 'next best'.
记忆技巧：想象一扇“成本之门”，你必须放弃你第二喜欢的东西才能通过。这扇“门”提醒你，每个选择都有标着“次优”的价格标签。
4. Factors of Production | 生产要素
The four factors of production are land, labour, capital, and enterprise. Land includes all natural resources. Labour is human effort and skills. Capital means man-made tools, machinery, and factories. Enterprise is the ability to organise the other three factors and take risks. Together they create the goods and services an economy needs.
生产的四个要素是土地、劳动力、资本和企业。土地包括所有自然资源。劳动力是人的努力和技能。资本指人造的工具、机器和工厂。企业是将其他三个要素组织起来并承担风险的能力。它们共同创造了经济所需的商品和服务。
Memory hack: Remember 'C-E-L-L' — Capital, Enterprise, Land, Labour. Or think of baking a cake: you need ingredients (land), a cook (labour), an oven (capital), and a recipe creator who invests in the shop (enterprise).
记忆技巧：记住“C-E-L-L”——资本、企业、土地、劳动力。或者想象烤蛋糕：你需要原料（土地）、厨师（劳动力）、烤箱（资本）以及投资商店的配方创造者（企业）。
5. Demand and Supply | 需求与供给
Demand refers to the quantity of a good or service that consumers are willing and able to buy at various prices, usually falling as price rises. Supply is the quantity producers are willing and able to sell, typically rising with price. The law of demand and the law of supply explain these opposite relationships.
需求指消费者在不同价格下愿意且能够购买的商品或服务的数量，通常随着价格上升而下降。供给是生产者愿意且能够出售的数量，通常随价格上升而增加。需求定律和供给定律解释了这些相反的关系。
Memory hack: Demand curves slope down like a 'D for Downhill'. Supply curves slope up; associate 'S' with 'Skyward'. A chart can help:
记忆技巧：需求曲线像“D”代表下坡（Downhill）。供给曲线向上倾斜；将“S”与“天空”（Skyward）联系起来。一张图表可以帮助记忆：
| Price Change | Demand Effect | Supply Effect |
| Price ↑ | Quantity demanded ↓ (contraction) | Quantity supplied ↑ (extension) |
| Price ↓ | Quantity demanded ↑ (extension) | Quantity supplied ↓ (contraction) |
Remember 'C-E' moves: Consumers buy more when price falls (extension), less when price rises (contraction). Producers do the reverse.
记住“C-E”移动：价格下跌时消费者购买更多（扩展），价格上涨时购买减少（收缩）。生产者则相反。
6. Market Equilibrium | 市场均衡
Equilibrium is the point where demand equals supply, so there is no tendency for price to change. At this price, the market clears with no leftover goods (surplus) and no unsatisfied buyers (shortage). If price is above equilibrium, a surplus occurs; below it, a shortage develops, pushing price back towards balance.
均衡是需求等于供给的点，因此价格没有变化的趋势。在此价格下，市场出清，没有剩余商品（过剩），也没有未满足的买家（短缺）。如果价格高于均衡，就会出现过剩；低于均衡，则出现短缺，将价格推回平衡。
Memory hack: Imagine a seesaw perfectly level — that's equilibrium. 'E' stands for 'Equal'. Use the phrase 'Balance the seesaw or you'll have a surplus puddle on one side or a shortage gap on the other.'
记忆技巧：想象一个完美水平的跷跷板——那就是均衡。“E”代表“相等”。用这样一句话：“平衡跷跷板，否则一边会有一滩过剩的积水，另一边则会有短缺的空隙。”
7. Price Elasticity of Demand (PED) | 需求的价格弹性
Price elasticity of demand measures how much the quantity demanded responds to a change in price. If demand changes a lot when price changes, it is elastic (e.g. luxury goods). If demand barely changes, it is inelastic (e.g. necessities like water). A PED value greater than 1 is elastic; less than 1 is inelastic.
需求的价格弹性衡量需求量对价格变化的反应程度。如果价格变化时需求量变化很大，就是有弹性的（例如奢侈品）。如果需求量几乎不变，就是缺乏弹性的（例如水等必需品）。PED 值大于 1 为弹性；小于 1 为缺乏弹性。
Memory hack: 'Elastic' stretches like a rubber band — quantity stretches a lot with a small price pull. 'Inelastic' is like a short tight rope — quantity barely moves. Formula for PED:
记忆技巧：“弹性”像橡皮筋一样伸展——价格小幅拉动，数量就拉伸很多。“缺乏弹性”像一根短而紧的绳子——数量几乎不动。PED 的计算公式：
PED = % change in quantity demanded ÷ % change in price
Remember: the result is always treated as an absolute value, so ignore the minus sign when interpreting elasticity.
记住：结果总是按绝对值处理，因此在解释弹性时忽略负号。
8. Market Failure | 市场失灵
Market failure occurs when the free market does not allocate resources efficiently, leading to a net social loss. Common causes include externalities (effects on third parties), public goods, information gaps, and monopoly power. Negative externalities like pollution mean too much of a harmful good is produced, while positive externalities like vaccines mean too little is made.
市场失灵发生在自由市场未能有效分配资源，导致净社会损失时。常见原因包括外部性（对第三方的影响）、公共物品、信息不对称和垄断力量。像污染这样的负外部性意味着生产了过多的有害商品，而疫苗这样的正外部性则意味着生产不足。
Memory hack: 'FAIL' — 'Free markets Actually Ignore Long-term costs'. Think of a factory dumping waste: the market price doesn't include clean-up, so it fails.
记忆技巧：“FAIL”——“自由市场实际上忽视长期成本”。想象一个倾倒废物的工厂：市场价格不包括清洁成本，因此市场失灵了。
9. Government Intervention | 政府干预
To correct market failure, governments can intervene using taxes, subsidies, regulations, and direct provision. A tax on cigarettes raises price and reduces consumption, internalising the external cost. A subsidy for renewable energy encourages production. Understanding these tools helps you evaluate economic policies.
为了纠正市场失灵，政府可以使用税收、补贴、监管和直接提供的方式进行干预。对香烟征税会提高价格并减少消费，从而将外部成本内部化。对可再生能源的补贴则鼓励生产。理解这些工具有助于你评估经济政策。
Memory hack: Use 'T-R-I-P' — Taxes, Rules, Information, Provision. For example, a sugar tax (T), ban on smoking indoors (R), heath campaigns (I), state-funded hospitals (P).
记忆技巧：使用“T-R-I-P”——税收、规则、信息、提供。例如，糖税（T）、室内吸烟禁令（R）、健康宣传运动（I）、国立医院（P）。
10. Macroeconomic Objectives | 宏观经济目标
Governments typically aim for four main targets: sustainable economic growth, low and stable inflation, low unemployment, and a favourable balance of payments. These objectives can sometimes conflict; for instance, rapid growth may raise inflation. WJEC students should know the meaning and measurement of each goal.
政府通常追求四个主要目标：可持续的经济增长、低而稳定的通货膨胀、低失业率和良好的国际收支平衡。这些目标有时会相互冲突；例如，高速增长可能推高通胀。WJEC 学生应当了解每个目标的含义和衡量方式。
Memory hack: Remember 'GULF' — Growth, Unemployment, Low inflation, Favourable trade balance. Imagine a calm Gulf sea to represent stability in all four areas.
记忆技巧：记住“GULF”——增长、失业、低通胀、顺差的贸易平衡（Favourable trade balance）。想象一个平静的海湾（Gulf）来代表这四个领域的稳定。
11. Inflation | 通货膨胀
Inflation is a sustained rise in the general price level of goods and services over time, reducing the purchasing power of money. It is measured by the Consumer Price Index (CPI). Causes include demand-pull (too much money chasing too few goods) and cost-push (rising production costs). A low, stable rate of around 2% is often targeted.
通货膨胀是商品和服务总体价格水平随时间的持续上升，从而降低了货币的购买力。它通过消费者价格指数（CPI）来衡量。原因包括需求拉动（过多的货币追逐过少的商品）和成本推动（生产成本的上升）。通常以 2% 左右的低而稳定的通胀率为目标。
Memory hack: Picture a balloon labelled 'Prices' inflating — it costs more to buy the same things. Use 'C-P-I' = 'Costs Puffing Inward' ke . Demand-pull is like too many people pulling the balloon up, cost-push is like squeezing it from the bottom.
记忆技巧：想象一个标着“价格”的气球在充气——购买同样的东西要花更多的钱。用“C-P-I”——“成本向内膨胀”。需求拉动就像太多人向上拉气球，成本推动就像从底部挤压它。
12. International Trade | 国际贸易
International trade allows countries to specialise in producing goods where they have a comparative advantage, leading to greater efficiency and a wider variety of products. Exports are goods sold abroad; imports are goods bought from abroad. A trade surplus means exports exceed imports, while a deficit means imports exceed exports.
国际贸易使各国能够专门生产其具有比较优势的商品，从而提高效率并增加产品多样性。出口是卖往国外的商品；进口是从国外购买的商品。贸易顺差意味着出口大于进口，贸易逆差意味着进口大于出口。
Memory hack: EX-ports = EXit the country; IM-ports = IMport into the country. Remember 'Trading is exchanging': you swap your specialised good (like software) for another's (like coffee). Comparative advantage means you' t making one thing relatively, even if another country makes everything absolutely better.
记忆技巧：出口（EXports）= EXit 国家；进口（IMports）= IMport 进入国家。记住“贸易即交换”：你用你的专业商品（如软件）去交换别人的（如咖啡）。比较优势意味着即使另一个国家绝对擅长制造所有东西，你在生产某样东西上的相对成本更低。
Published by TutorHao | Economics Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图