📚 Year 7 AQA Economics: Key Concepts Review | AQA 七年级经济：核心知识点梳理
Economics is the study of how people make choices to satisfy their needs and wants. For Year 7 students, understanding core economic concepts builds a foundation for everyday decision-making and future studies. This revision guide covers key topics such as scarcity, opportunity cost, demand and supply, and different economic systems.
经济学研究人们如何做出选择以满足需求和欲望。对七年级学生来说，理解核心经济概念为日常决策和未来学习打下基础。这份复习指南涵盖了稀缺性、机会成本、需求与供给以及不同的经济体系等关键主题。
1. What is Economics? | 什么是经济学？
Economics is a social science that examines how individuals, businesses, and governments allocate limited resources to produce goods and services. It helps us understand the world around us, from why prices change to how jobs are created.
经济学是一门社会科学，它研究个人、企业和政府如何分配有限资源来生产商品和服务。它帮助我们理解周围的世界，从价格为何变动到就业机会如何创造。
In Year 7, you will learn the basic ideas economists use to analyse problems. You do not need to be a mathematician; you simply need to think logically about choices and trade-offs. The subject is about observing the real world and asking questions like "What should we produce?" and "Who gets to consume it?"
在七年级，你将学习经济学家分析问题的基本理念。你不需要成为数学家；你只需要有逻辑地思考选择和权衡。这门学科是关于观察真实世界并提出诸如“我们应该生产什么？”以及“谁将消费它？”这样的问题。
2. Scarcity and Choice | 稀缺性与选择
Scarcity means that resources are limited, while human wants are unlimited. Because of scarcity, we must make choices. Every choice involves giving something up. Even the richest countries face scarcity because they cannot produce everything every citizen desires.
稀缺性意味着资源是有限的，而人类的欲望是无限的。由于稀缺性的存在，我们必须做出选择。每一个选择都涉及放弃一些东西。即便最富裕的国家也面临稀缺性，因为它们无法生产出每个公民想要的一切。
Examples of scarce resources include time, money, natural resources such as oil, and labour. Since resources are scarce, societies must answer three fundamental questions: what to produce, how to produce it, and for whom to produce it.
稀缺资源的例子包括时间、金钱、石油等自然资源以及劳动力。由于资源是稀缺的，社会必须回答三个基本问题：生产什么、如何生产以及为谁生产。
3. Opportunity Cost | 机会成本
Opportunity cost is the next best alternative that you give up when making a decision. For instance, if you spend your pocket money on a video game, the opportunity cost might be the cinema ticket you could have bought instead. The concept reminds us that there is no such thing as a free choice.
机会成本是你在做决定时放弃的次优选择。例如，如果你用零花钱买了电子游戏，那么机会成本可能就是那张你本来可以买的电影票。这个概念提醒我们，没有什么是免费的选择。
Governments also face opportunity costs. If the government decides to build a new hospital, the opportunity cost might be the new school that cannot be built with the same money. Understanding opportunity cost helps individuals and firms make smarter decisions.
政府也面临机会成本。如果政府决定建造一家新医院，机会成本可能就是无法用同一笔钱建造的新学校。理解机会成本有助于个人和企业做出更明智的决策。
4. Needs and Wants | 需要与欲望
Needs are goods or services essential for survival, such as water, food, shelter, and clothing. Wants are items we desire but can live without, like smartphones, designer sneakers, or holidays abroad. This distinction helps in creating personal budgets and understanding consumer behaviour.
需要是生存所必需的商品或服务，如水、食物、住所和衣物。欲望是我们渴望但并非生活必需的物品，如智能手机、名牌运动鞋或海外度假。这种区分有助于制定个人预算和理解消费者行为。
Economists often group needs and wants together under the term utility, which refers to the satisfaction gained from consuming something. Even a want can provide utility, but prioritising needs ensures basic well-being.
经济学家常将需要和欲望统称为效用，即从消费某物中获得的满足感。即便是欲望也能提供效用，但优先满足需要才能保证基本的生活福祉。
5. Demand | 需求
Demand refers to the quantity of a good or service that consumers are willing and able to buy at a given price over a period of time. The law of demand states that, other things being equal, as the price of an item increases, the quantity demanded decreases.
需求是指在给定时期内，消费者愿意并且能够以特定价格购买的商品或服务的数量。需求定律指出，在其他条件相同的情况下，随着商品价格上升，需求量下降。
A simple demand schedule helps to see this relationship:
| Price per chocolate bar (£) | Quantity demanded (per week) |
|---|---|
| 0.50 | 100 |
| 1.00 | 70 |
| 1.50 | 40 |
一个简单的需求表有助于观察这种关系：
| 每条巧克力棒的价格（英镑） | 每周需求量 |
|---|---|
| 0.50 | 100 |
| 1.00 | 70 |
| 1.50 | 40 |
A rise in price leads to a contraction in quantity demanded, while a fall in price causes an expansion. Factors other than price, such as income or tastes, can shift the entire demand curve, but at Year 7 we focus on the price–quantity relationship.
价格上升导致需求量收缩，价格下降则导致需求量扩张。除价格以外的因素，如收入或品味，会使整条需求曲线移动，但在七年级我们重点关注价格与需求量的关系。
6. Supply | 供给
Supply is the amount of a good or service that producers are willing and able to offer for sale at various prices. The law of supply states that, ceteris paribus, as the price rises, the quantity supplied increases, because higher prices usually mean higher profits.
供给是指生产者在不同价格下愿意并能够提供出售的商品或服务的数量。供给定律指出，在其他条件不变的情况下，随着价格上升，供给量增加，因为更高的价格通常意味着更高的利润。
Consider a bakery: if the price of bread rises from £1.20 to £2.00, the baker is likely to bake more loaves to earn extra revenue. If the price drops below cost, they would cut production. This positive relationship between price and quantity supplied is shown by an upward-sloping supply curve.
以面包店为例：如果面包价格从1.20英镑涨到2.00英镑，面包师很可能会烤制更多面包以赚取额外收入。如果价格跌至成本以下，他们就会减产。这种价格与供给量之间的正相关关系表现为一条向上倾斜的供给曲线。
7. Market and Price | 市场与价格
A market is any mechanism that brings buyers and sellers together. The equilibrium price is the point where the quantity demanded equals the quantity supplied. At this price, the market clears, meaning there is no excess demand or excess supply.
市场是任何使买卖双方走到一起的机制。均衡价格是需求量等于供给量时的价格。在这个价格下，市场出清，意味着没有超额需求或超额供给。
Equilibrium: Quantity Demanded = Quantity Supplied
均衡：需求量 = 供给量
If the price is set above equilibrium, a surplus occurs and producers may cut prices. If the price is below equilibrium, a shortage emerges, encouraging higher prices. Markets constantly adjust towards equilibrium through the price mechanism.
如果价格设定在均衡之上，就会出现过剩，生产者可能会降价。如果价格低于均衡，就会出现短缺，推动价格上升。市场通过价格机制不断向均衡调整。
8. Money and Exchange | 货币与交换
Money serves as a medium of exchange, eliminating the inefficiencies of barter. It also functions as a store of value and a unit of account. These three roles make trade and saving much easier than relying on swapping goods directly.
货币充当交换媒介，消除了物物交换的低效。它还发挥着价值储藏和记账单位的功能。这三种职能使得贸易和储蓄比直接以物易物要容易得多。
In modern economies, money can take the form of coins, banknotes, and digital balances. Without money, people would need a double coincidence of wants — finding someone who has what you want and wants what you have, which is extremely time-consuming.
在现代经济中，货币可以以硬币、纸币和数字余额的形式存在。没有货币，人们就需要满足需求的双重巧合——找到一个拥有你所想要的东西并且也想要你所拥有之物的人，这极其耗时。
9. Economic Systems | 经济体系
Different societies answer the three economic questions in different ways. The main types are market economies, where decisions are driven by consumers and firms; command economies, where the government controls production and distribution; and mixed economies, which combine elements of both.
不同的社会以不同的方式回答三个经济问题。主要有市场经济（由消费者和公司推动决策）、计划经济（政府控制生产和分配）以及混合经济（结合了两者要素）。
| System | Who decides? | Example |
|---|---|---|
| Market | Individuals and firms | USA (mostly) |
| Command | Government | North Korea |
| Mixed | Both private and public sectors | United Kingdom |
以下是经济体系的比较：
| 经济体系 | 谁做决策？ | 例子 |
|---|---|---|
| 市场经济 | 个人与公司 | 美国（大体上） |
| 计划经济 | 政府 | 朝鲜 |
| 混合经济 | 私营和公共部门 | 英国 |
Most real-world economies are mixed, with some government intervention to correct market failures and provide public services like education and defence.
现实世界中大多数经济体都是混合型的，政府会进行一定程度的干预，以纠正市场失灵并提供教育和国防等公共服务。
10. Production and Consumption | 生产与消费
Production is the process of converting inputs (factors of production) into outputs – goods and services. The four factors are land, labour, capital, and enterprise. Consumption is the act of using these goods and services to satisfy wants and needs.
生产是将投入（生产要素）转化为产出——商品和服务的过程。四种生产要素是土地、劳动、资本和企业家才能。消费则是使用这些商品和服务来满足欲望和需要的行为。
Specialisation occurs when workers or firms concentrate on a narrow range of tasks. This raises productivity, as shown by Adam Smith's example of a pin factory where dividing tasks increased output many times over. Specialisation, however, creates interdependence because no one produces everything they need.
专业化发生在工人或公司专注于完成特定任务时。这提高了生产率，正如亚当·斯密以别针工厂为例所示，分工使产量增加了很多倍。然而，专业化也带来了相互依赖，因为没有人生产自己所需要的一切。
11. Budgeting and Saving | 预算与储蓄
A budget is a financial plan that lists expected income and expenses over a period, usually a month. Budgeting helps individuals avoid overspending and ensures that essential needs are met before spending on wants. Saving means setting aside part of current income for future use.
预算是列出预期收入和支出的财务计划，通常以月为单位。编制预算有助于个人避免超支，并确保基本需求在欲望消费之前得到满足。储蓄意味着将当前收入的一部分留作未来使用。
Young people can practise budgeting by managing a weekly allowance. If you receive £10 per week and your goal is to buy a £30 video game, you could save £5 per week for six weeks. The opportunity cost might be the snacks you forgo while saving.
年轻人可以通过管理每周的零花钱来练习预算。如果你每周拿到10英镑，而你的目标是买一款30英镑的电子游戏，你可以每周存5英镑，存六周。机会成本可能是你在储蓄期间放弃的零食。
12. Introduction to International Trade | 国际贸易入门
International trade occurs when countries exchange goods and services. Imports are products bought from other nations; exports are products sold abroad. Trade enables countries to specialise in producing what they are relatively better at, a concept called comparative advantage.
当国家之间交换商品和服务时，就发生了国际贸易。进口是从其他国家购买的产品；出口是销往国外的产品。贸易使各国能够专业化生产自己相对更擅长的东西，这一概念称为比较优势。
For example, the United Kingdom might export financial services and import tropical fruits. Without trade, consumers would have fewer choices and could face higher prices. Although trade brings benefits, it can also create challenges such as job losses in industries facing foreign competition.
例如，英国可能出口金融服务并进口热带水果。如果没有贸易，消费者的选择会变少，并可能面临更高的价格。尽管贸易带来好处，但它也可能带来挑战，例如面临外国竞争的行业会出现失业。
Published by TutorHao | Economics Revision Series | aleveler.com
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