📚 Year 8 Cambridge Economics: Core Knowledge Review | Year 8 剑桥经济学：核心知识点梳理
Economics is the study of how people make choices when resources are limited. For Year 8 Cambridge students, building a solid foundation in key concepts such as scarcity, opportunity cost, and how markets work is essential before moving on to more advanced topics. This article provides a structured review of the core knowledge you need, covering everything from the basic economic problem to the role of money and government. Each section presents a clear English explanation followed by its Chinese equivalent, so you can learn bilingually and strengthen your understanding for class tests and checkpoints.
经济学研究的是人们在资源有限的情况下如何做出选择。对于 Year 8 剑桥学生来说，在进入更高级的主题之前，扎实掌握稀缺性、机会成本以及市场运作方式等核心概念至关重要。本文为你梳理了必须掌握的基础知识，涵盖从基本经济问题到货币与政府角色等各个方面。每个部分都先给出英文讲解再配以中文对照，帮助你双语学习，为课堂测验和 checkpoint 考试打好基础。
1. What is Economics? | 什么是经济学？
Economics is a social science that looks at how individuals, businesses, and governments make decisions about using limited resources to satisfy unlimited wants. It is not just about money; it also explores production, consumption, and the distribution of goods and services.
经济学是一门社会科学，研究个人、企业和政府如何利用有限的资源来满足无限的欲望。它不仅仅与金钱有关，还探讨商品与服务的生产、消费和分配。
At its heart, economics tries to answer three big questions: What should we produce? How should we produce it? And for whom should we produce it? These questions arise because resources like time, land, and labour are scarce.
经济学的核心是试图回答三大问题：我们应该生产什么？如何生产？为谁生产？这些问题之所以存在，是因为时间、土地和劳动力等资源是稀缺的。
2. Scarcity and Choice | 稀缺性与选择
Scarcity means that there are not enough resources to meet all human wants. Everything is limited - natural resources, skilled workers, machinery, and even time. Because of scarcity, people, businesses, and governments must constantly make choices.
稀缺性意味着没有足够的资源来满足所有人的欲望。一切资源都是有限的——自然资源、技术工人、机器甚至时间。正因为稀缺，个人、企业和政府必须不断做出选择。
When we choose one thing, we give up another. This trade-off is the basis of all economic decisions. For example, a student might choose to spend an extra hour studying economics instead of playing video games. The time given up is the cost of that decision.
当我们选择一样东西时，就意味着放弃了另一样。这种权衡是所有经济决策的基础。例如，一个学生可能选择多花一小时学习经济学而不是玩电子游戏。放弃的那一小时时间就是这个决定的代价。
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 the sum of all alternatives, only the single most valued option you have to forgo. Understanding opportunity cost helps you think about what you truly sacrifice with every decision.
机会成本是指做选择时所放弃的次优选择的价值。它不是所有选择的总和，只是你必须舍弃的那个最有价值的选项。理解机会成本能帮助你思考每个决定真正牺牲的是什么。
Imagine a family has £50 to either buy a new school bag or go out for dinner. If they choose the school bag, the opportunity cost is the enjoyment of the meal. Economists use this concept to explain why rational people compare benefits and costs before acting.
假设一个家庭有 50 英镑，可以买一个新书包或者外出吃一顿晚餐。如果他们选择了书包，机会成本就是那顿晚餐带来的享受。经济学家用这个概念解释为什么理性的人在行动前会比较收益与成本。
4. Factors of Production | 生产要素
To produce any good or service, four main factors of production are needed: land, labour, capital, and enterprise. Land includes all natural resources like water, minerals, and forests. Labour refers to human effort, both physical and mental.
生产任何商品或服务都需要四种主要的生产要素：土地、劳动力、资本和企业家精神。土地包括水、矿产、森林等所有自然资源。劳动力指的是人类的体力和脑力劳动。
Capital means man-made tools and equipment used to produce other goods, such as machinery, factories, and computers. Enterprise is the ability of entrepreneurs to combine the other three factors, take risks, and innovate. All four factors are limited, reinforcing the problem of scarcity.
资本是指用于生产其他商品的人造工具和设备，例如机器、工厂和计算机。企业家精神则是企业家组合其他三种要素、承担风险和进行创新的能力。这四种要素都是有限的，进一步加剧了稀缺性问题。
5. Needs and Wants | 需求与欲望
In economics, needs are goods and services essential for survival, such as food, water, shelter, and clothing. Wants are things we desire but are not necessary for staying alive, like smartphones, holidays, and brand-name clothing. The line between needs and wants can sometimes be blurry, but the distinction is important when studying consumer behaviour.
在经济学中，需求是生存所必需的商品和服务，例如食物、水、住所和衣物。欲望则是我们渴望但并非维持生命所必需的东西，如智能手机、度假和名牌服装。需求和欲望之间的界限有时很模糊，但在研究消费者行为时这种区分很重要。
People have unlimited wants, but resources to produce goods and services are limited. This gap forces societies to decide which wants to satisfy first. Even when focusing on needs, choices must be made because resources cannot produce everything at once.
人们拥有无限的欲望，但生产商品和服务的资源是有限的。这种差距迫使社会决定优先满足哪些欲望。即便只考虑需求层面，也必须做出选择，因为资源无法同时生产所有东西。
6. Demand and Supply | 需求与供给
Demand is the quantity of a good or service that consumers are willing and able to buy at different prices over a certain period. According to the law of demand, as price falls, quantity demanded increases, and as price rises, quantity demanded falls, assuming other factors stay the same.
需求是指在一定时期内，消费者在不同价格水平上愿意并且有能力购买的商品或服务的数量。根据需求定律，在其他条件不变的情况下，价格下降时需求量增加，价格上升时需求量减少。
Supply is the quantity of a good or service that producers are willing and able to offer for sale at different prices. The law of supply states that as price increases, quantity supplied rises, and as price decreases, quantity supplied falls, because higher prices usually mean higher potential profits.
供给是指生产者在不同价格水平上愿意并且有能力出售的商品或服务的数量。供给定律指出，价格上升时供给量增加，价格下降时供给量减少，因为更高的价格通常意味着更高的潜在利润。
7. Market Equilibrium | 市场均衡
Market equilibrium occurs when the quantity demanded by consumers equals the quantity supplied by producers at a certain price. This price is called the equilibrium price, and there is no tendency for it to change unless demand or supply conditions shift.
市场均衡出现在消费者需求量等于生产者供给量时的某一价格水平。该价格被称为均衡价格，除非需求或供给条件发生变化，否则价格没有变动的趋势。
If the price is set above equilibrium, a surplus occurs because supply exceeds demand, and producers may lower prices. If the price is below equilibrium, a shortage occurs because demand exceeds supply, and buyers may bid up the price. Markets naturally move toward equilibrium through these pressures.
如果价格高于均衡水平，就会出现过剩，因为供给大于需求，生产者可能会降低价格。如果价格低于均衡水平，就会出现短缺，因为需求大于供给，买家会抬高价格。在这些压力下，市场会自然地趋向均衡。
8. Specialisation and Trade | 专业化与贸易
Specialisation means focusing on producing a limited range of goods or services in which an individual, firm, or country has an advantage. By specialising, workers become more skilled and efficient, which increases output. This concept is linked to the division of labour, where a production process is broken into many small tasks.
专业化是指个人、企业或国家专注于生产自身具有优势的有限范围的商品或服务。通过专业化，工人变得更加熟练和高效，从而增加产出。这一概念与分工相关，即生产流程被分解成许多细小任务。
Trade allows people and countries to exchange the goods and services they produce. When entities specialise and then trade, they can enjoy a greater variety of goods than if they tried to be self-sufficient. For example, a farmer who specialises in wheat can trade for meat and clothing, benefiting both sides.
贸易使得人与人、国与国之间能够交换他们生产的商品和服务。当各主体实行专业化再进行贸易时，他们可以享受到比自给自足时更多样的商品。例如，专门种植小麦的农民可以用小麦换取肉类和衣物，实现互利。
9. Money and Its Functions | 货币及其功能
Money is anything that is widely accepted as payment for goods and services. It serves three main functions: a medium of exchange, a unit of account, and a store of value. Without money, economies would rely on barter, which is inefficient because it requires a double coincidence of wants.
货币是指被广泛接受用于支付商品和服务的任何东西。它有三个主要功能：交易媒介、计价单位和价值储存手段。如果没有货币，经济将依赖物物交换，这种方式效率低下，因为它需要需求的双重巧合。
As a medium of exchange, money makes trade smoother by eliminating the need to swap goods directly. As a unit of account, it provides a common measure for pricing goods. As a store of value, money can be saved and used in the future, although inflation can reduce its purchasing power.
作为交易媒介，货币消除了直接交换商品的必要，使贸易更加顺畅。作为计价单位，它为商品定价提供了通用衡量标准。作为价值储存手段，货币可以储蓄并用于将来，尽管通货膨胀会降低其购买力。
10. Personal Finance Basics | 个人理财基础
Personal finance involves managing your own money, including income, spending, saving, and budgeting. A budget is a plan that shows expected income and expenses over a period. Learning to budget helps young people make informed choices and avoid debt.
个人理财涉及管理自己的金钱，包括收入、支出、储蓄和预算。预算是一个显示一段时间内预期收入和支出的计划。学习做预算能帮助年轻人做出明智选择并避免债务。
Income can come from pocket money, part-time jobs, or gifts. Wise spending means distinguishing between needs and wants and comparing prices before buying. Saving part of your income builds financial security and makes it possible to afford larger items in the future, such as a bicycle or an educational course.
收入可能来自零花钱、兼职工作或礼物。明智消费意味着区分需求与欲望，并在购买前比较价格。将部分收入存起来可以建立财务安全，并让你未来有能力购买更大的物品，例如一辆自行车或一门教育课程。
11. Economic Systems | 经济体制
An economic system is the way a society organises production, distribution, and consumption of goods and services. The three basic types are market economies, command economies, and mixed economies. In a pure market economy, decisions are driven by consumers and producers with little government intervention.
经济体制是社会组织商品和服务的生产、分配与消费的方式。三种基本类型是市场经济、计划经济和混合经济。在纯粹的市场经济中，决策由消费者和生产者推动，政府干预很少。
In a command economy, the government makes most economic decisions, owning resources and directing production. Most modern countries, including the United Kingdom, have mixed economies where both the private sector and the government play important roles, combining market forces with regulations and public services.
在计划经济中，政府做出大多数经济决策，拥有资源并指导生产。包括英国在内的大多数现代国家实行混合经济，私营部门和政府都扮演重要角色，将市场力量与法规和公共服务结合起来。
12. The Role of Government | 政府的角色
Governments influence the economy in several ways: they provide public goods like street lighting and defence, regulate markets to protect consumers and workers, and redistribute income through taxes and welfare. They also aim to maintain economic stability by controlling inflation and encouraging employment.
政府以多种方式影响经济：提供路灯、国防等公共物品，监管市场以保护消费者和工人，并通过税收和福利进行收入再分配。政府还旨在通过控制通货膨胀和促进就业来维持经济稳定。
Taxation is a key tool used to raise revenue for public services such as education, health care, and infrastructure. At the Year 8 level, it is important to understand that government spending and taxation are connected, and the choices made reflect the priorities of a society and its leaders.
税收是为教育、医疗和基础设施等公共服务筹集资金的关键工具。在 Year 8 阶段，理解政府支出与税收之间的联系很重要，而所作出的选择反映了一个社会及其领导人的优先事项。
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