📚 Year 7 Cambridge Economics: Core Concepts Review | Year 7 剑桥经济：核心知识点梳理
Understanding economics at Year 7 level introduces you to the fundamental ideas that explain how people make choices, how resources are used, and how societies organise themselves to meet their needs. This guide covers the essential concepts you will encounter in the Cambridge Lower Secondary Economics curriculum, providing clear explanations and examples to help you build a strong foundation for further study.
在 Year 7 阶段学习经济学，你将接触到解释人们如何做出选择、如何使用资源以及社会如何组织自身以满足需求的基本理念。本指南涵盖了剑桥初中经济学课程中的核心概念，配以清晰的解释和实例，帮助你为后续学习打下坚实基础。
1. What is Economics? | 什么是经济学？
Economics is the study of how individuals, businesses, and governments make choices when faced with limited resources. It helps us understand how to allocate scarce resources to satisfy unlimited wants and needs.
经济学是研究个人、企业和政府在面对有限资源时如何做出选择的学科。它帮助我们理解如何分配稀缺资源以满足无限的需求和欲望。
There are two main branches of economics: microeconomics, which focuses on individual consumers and firms, and macroeconomics, which looks at the economy as a whole. At Year 7, we concentrate on basic microeconomic ideas.
经济学有两个主要分支：微观经济学关注单个消费者和企业，宏观经济学则着眼于整体经济。在 Year 7 阶段，我们主要学习基本的微观经济学理念。
2. Scarcity and Choice | 稀缺性与选择
Scarcity is the fundamental economic problem. It means that there are not enough resources to produce all the goods and services that people want. Because of scarcity, we must make choices about how to use our resources.
稀缺性是根本的经济问题。它意味着没有足够的资源来生产人们想要的所有商品和服务。由于稀缺性，我们必须就如何使用资源做出选择。
Choices involve trade-offs. When you choose one thing, you give up the opportunity to have something else. This leads to the concept of opportunity cost.
选择涉及权衡取舍。当你选择一件事时，你就放弃了获得其他东西的机会。这就引出了机会成本的概念。
3. Opportunity Cost | 机会成本
Opportunity cost is the value of the next best alternative that you give up when making a decision. It is not simply the money spent; it is what you could have done or gained instead. For example, if you spend your pocket money on a video game, the opportunity cost might be the cinema ticket you did not buy.
机会成本是你在做决定时放弃的次优选择的价值。它不单单是花费的金钱，而是你本可以做的事情或本可获得的收益。例如，如果你用零花钱买了一个电子游戏，机会成本可能就是你没有购买的電影票。
Understanding opportunity cost helps individuals and businesses make better choices by comparing the benefits of different options.
理解机会成本有助于个人和企业通过比较不同选项的收益来做出更好的决策。
4. Needs and Wants | 需要与想要
In economics, needs are things that are essential for survival, such as food, water, shelter, and clothing. Wants are things that we would like to have but are not necessary for survival, like smartphones, holidays, or designer clothes.
在经济学中，需要是生存所必需的东西，如食物、水、住所和衣物。想要是我们希望拥有但并非生存必需的东西，如智能手机、度假或名牌服装。
Our wants are unlimited, but resources are limited, which creates the problem of scarcity. Economists study how people prioritise their wants.
我们的欲望是无限的，但资源是有限的，这就产生了稀缺性问题。经济学家研究人们如何对需求进行优先排序。
5. Factors of Production | 生产要素
Goods and services are produced using resources called factors of production. There are four main factors: land, labour, capital, and enterprise. Each factor earns a reward: rent for land, wages for labour, interest for capital, and profit for enterprise.
商品和服务是利用被称为生产要素的资源生产出来的。主要有四种要素：土地、劳动、资本和企业家才能。每种要素都获得相应的回报：土地获得地租，劳动获得工资，资本获得利息，企业家才能获得利润。
Land includes all natural resources such as oil, water, forests, and fertile soil. Labour is the human effort, both physical and mental, used in production. Capital refers to man-made resources like machinery, tools, and factories that help produce other goods. Enterprise is the ability to combine the other three factors, take risks, and organise production.
土地包括所有自然资源，如石油、水、森林和肥沃的土壤。劳动是生产中的人的努力，包括体力和脑力。资本是指人造资源，如机器、工具和工厂，用于帮助生产其他商品。企业家才能是将其他三种要素组合起来、承担风险并组织生产的能力。
The following table summarises these factors and their typical rewards:
下表总结了这些要素及其典型回报：
| Factor | Description | Reward |
|---|---|---|
| Land | Natural resources | Rent |
| Labour | Human effort | Wages |
| Capital | Man-made tools & equipment | Interest |
| Enterprise | Risk-taking & organisation | Profit |
6. Introduction to Demand and Supply | 供需入门
Demand refers to the quantity of a good or service that consumers are willing and able to buy at different prices. The law of demand states that as the price of a product increases, the quantity demanded decreases, and vice versa, assuming other factors remain constant.
需求是指消费者在不同价格水平下愿意并且能够购买的商品或服务的数量。需求定律指出，在其他条件不变的情况下，随着产品价格上涨，需求量下降，反之亦然。
P ↑ → Qd ↓
价格上升 → 需求量下降
Supply refers to the quantity of a good or service that producers are willing and able to sell at different prices. The law of supply states that as the price increases, the quantity supplied increases, because higher prices give producers an incentive to produce more.
供给是指生产者在不同价格水平下愿意并且能够出售的商品或服务的数量。供给定律指出，随着价格上涨，供给量增加，因为更高的价格激励生产者增加产量。
P ↑ → Qs ↑
价格上升 → 供给量增加
7. Markets and Equilibrium | 市场与均衡
A market is any place or mechanism where buyers and sellers interact to exchange goods and services. The equilibrium price is the price at which the quantity demanded equals the quantity supplied. At this point, the market is said to clear, with no surplus or shortage.
市场是买卖双方互动以交换商品和服务的任何场所或机制。均衡价格是需求量等于供给量时的价格。在这个点上，市场出清，没有盈余或短缺。
If the price is above equilibrium, there will be a surplus (excess supply), which puts downward pressure on price. If the price is below equilibrium, there will be a shortage (excess demand), pushing the price upward.
如果价格高于均衡水平，就会出现盈余（超额供给），从而对价格施加下行压力。如果价格低于均衡水平，就会出现短缺（超额需求），推动价格上涨。
Market forces of supply and demand tend to move the price towards equilibrium automatically, acting like an ‘invisible hand’.
市场的供求力量像一只”看不见的手”，往往能自动推动价格向均衡点移动。
8. Consumers and Producers | 消费者与生产者
Consumers are individuals who purchase goods and services to satisfy their needs and wants. Their spending decisions are influenced by income, tastes, prices, and advertising. Producers are businesses that supply goods and services to the market. They aim to maximise profits by keeping costs low and selling at competitive prices.
消费者是购买商品和服务以满足自身需要和欲望的个人。他们的消费决策受收入、品味、价格和广告的影响。生产者是向市场提供商品和服务的企业。他们旨在通过保持低成本并以有竞争力的价格销售来实现利润最大化。
Consumers and producers are interdependent. Consumers provide labour to producers and receive wages in return, which they then spend on goods. This relationship forms a simple circular flow of income in the economy.
消费者和生产者相互依存。消费者向生产者提供劳动力并获得工资，然后用工资购买商品。这种关系构成了经济中简单的收入循环流动。
9. Specialisation and Trade | 专业化与贸易
Specialisation occurs when individuals, businesses, or countries focus on producing a limited range of goods or services in which they have an advantage. This can lead to higher productivity and efficiency. The division of labour is a form of specialisation where a production process is broken down into separate tasks, each performed by different workers.
专业化是指个人、企业或国家专注于生产其具有优势的有限范围的商品或服务。这可以提高生产率和效率。劳动分工是专业化的一种形式，将生产过程分解为不同的任务，由不同的工人完成。
Because of specialisation, trade becomes essential. People and countries exchange the goods they produce for others they need. This is based on comparative advantage, where a party can produce a good at a lower opportunity cost than another.
由于专业化，贸易变得至关重要。人们和国家用自己生产的商品交换所需要的其他商品。这基于比较优势原则，即一方能够以更低的机会成本生产某种商品。
Trade allows everyone to benefit from specialisation, leading to a greater variety of goods and lower prices for consumers.
贸易使每个人都能从专业化中获益，为消费者带来更丰富的商品种类和更低的价格。
10. Economic Systems | 经济体系
Different societies organise their economies in different ways. The three main types of economic systems are market economies, command economies, and mixed economies. In a market economy, decisions are made by individuals and firms through supply and demand. In a command economy, the government controls what, how, and for whom to produce.
不同社会以不同方式组织经济。三种主要的经济体系类型是市场经济、计划经济和混合经济。在市场经济中，由个人和企业通过供求关系做出决策。在计划经济中，由政府控制生产什么、如何生产以及为谁生产。
Most countries today have mixed economies, which combine elements of both. The government intervenes in areas like education, healthcare, and infrastructure, while allowing markets to operate in others. The balance between market freedom and government control varies from country to country.
当今大多数国家实行混合经济，结合了两者的要素。政府在教育、医疗和基础设施等领域进行干预，同时允许市场在其他领域运行。市场自由与政府控制之间的平衡因国家而异。
11. Money and Its Functions | 货币及其职能
Money is anything that is widely accepted as a medium of exchange. For money to work effectively, it must fulfil three main functions: a medium of exchange, a unit of account, and a store of value. Early economies used barter, but this was inefficient because of the need for a double coincidence of wants.
货币是任何被广泛接受作为交换媒介的东西。货币要有效运作，必须满足三个主要职能：交换媒介、计价单位和价值储藏。早期经济使用物物交换，但由于需要需求的双重巧合而效率低下。
Modern money takes the form of coins, banknotes, and digital balances. The central bank issues currency and manages the money supply to ensure economic stability and keep inflation under control.
现代货币的形式包括硬币、纸币和数字余额。中央银行发行货币并管理货币供应，以确保经济稳定和控制通货膨胀。
12. Applying Economic Concepts to Everyday Life | 经济概念在日常生活中的应用
Economics is not just theory – it is a way of thinking about everyday decisions. When you decide whether to buy lunch at the school canteen or bring a packed lunch, you are weighing costs and benefits and considering opportunity cost. When you choose how to spend your weekend, you are allocating your scarce time among different wants.
经济学不仅仅是理论，更是一种思考日常决策的方式。当你决定是在学校食堂买午餐还是自带午餐时，你就在权衡成本和收益，并考虑机会成本。当你选择如何度过周末时，你就在不同的欲望之间分配稀缺的时间。
Even at a young age, understanding concepts like specialisation can explain why your parents may trade their skills for a salary and use that money to buy things they do not produce themselves. Recognising the role of consumers and producers helps you see the economy at work all around you.
即使年纪还小，理解诸如专业化的概念也能解释为什么你的父母可能用自己的技能换取薪水，并用这些钱来购买他们自己不生产的东西。认识到消费者和生产者的角色，有助于你看到经济在你身边的运作。
Published by TutorHao | Economics Revision Series | aleveler.com
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