📚 Year 7 OCR Economics: Core Knowledge Review | Year 7 OCR 经济：核心知识点梳理
Welcome to your essential guide for Year 7 OCR Economics. This resource revisits the key concepts you will encounter throughout the course, from understanding why we cannot have everything we want, to the way markets set prices, and how money helps trade. By linking theory to everyday life, you will gain the confidence to explain economic ideas clearly and apply them to real-world situations. Use this review alongside your class notes to strengthen your knowledge.
欢迎阅读 Year 7 OCR 经济学的核心知识梳理。这篇文章将带你回顾课程中的重要概念，从理解为什么我们不能拥有想要的一切，到市场如何决定价格，以及货币如何促进交易。通过将理论与日常生活联系起来，你将能够清晰地解释经济观点，并应用于实际情境。请将这篇复习材料与课堂笔记结合使用，以巩固你的知识。
1. What is Economics? | 什么是经济学？
Economics is the social science that investigates how people, firms and governments make decisions when resources are limited. It focuses on the production, distribution and consumption of goods and services. Rather than simply describing money, economics studies choices and trade-offs.
经济学是一门研究个人、企业和政府在资源有限时如何做出决策的社会科学。它关注商品和服务的生产、分配与消费。经济学不只是描述金钱，而是研究选择和权衡。
A key idea is that every choice involves a cost. When you decide to spend an hour studying economics, you cannot use that same hour to play sport or watch a film. Economics helps us think systematically about such decisions.
一个核心理念是每个选择都涉及成本。当你决定花一小时学习经济学时，你就不能用同一小时去运动或看电影。经济学帮助我们有条理地思考这类决策。
2. Scarcity and Choice | 稀缺性与选择
Scarcity exists because resources are finite while human wants are infinite. No matter how wealthy a society becomes, it cannot produce enough to satisfy everyone’s unlimited desires. Scarcity forces individuals and societies to make choices about what to produce, how to produce and for whom to produce.
稀缺性的存在是因为资源是有限的，而人类的欲望是无限的。无论一个社会变得多么富裕，它都无法生产足够的商品来满足每个人无限的欲望。稀缺性迫使个人和社会做出选择：生产什么、如何生产以及为谁生产。
For example, a farmer has a fixed amount of land. She must decide whether to use it to grow wheat or to raise livestock. That choice illustrates scarcity: she cannot do both on the same plot simultaneously. Economics is fundamentally about managing scarcity.
例如，一个农民拥有固定数量的土地。她必须决定是用它来种小麦还是养牲畜。这个选择体现了稀缺性：她无法在同一块地上同时做这两件事。经济学从根本上讲就是管理稀缺性。
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 simply the money spent, but what you sacrifice in terms of other goods, services or experiences. Recognising opportunity cost leads to more informed decision-making.
机会成本是你在做出选择时所放弃的次优选择的价值。它不仅仅指花掉的钱，更是你以其他商品、服务或体验的形式作出的牺牲。认识到机会成本能帮助你做出更明智的决策。
If a student uses her savings to buy a bicycle instead of a gaming console, the opportunity cost is the enjoyment and use she would have gained from the console. Similarly, when a government spends more on healthcare, the opportunity cost may be fewer resources for education.
如果一名学生用她的积蓄买了一辆自行车而不是游戏机，那么机会成本就是她本可以从游戏机中获得的乐趣和使用体验。同样，当政府在医疗保健上投入更多时，机会成本可能是教育获得的资源减少。
4. The Basic Economic Problem | 基本经济问题
The basic economic problem arises from the combination of scarcity and unlimited wants. It forces every economy to answer three fundamental questions: what should be produced, how should it be produced, and who should receive the output. These questions apply to all societies, whether they rely on markets or central planning.
基本经济问题产生于稀缺性与无限欲望的结合。它迫使每个经济体回答三个基本问题：应该生产什么、如何生产以及谁应该获得产出。这些问题适用于所有社会，无论其依赖市场还是中央计划。
In a market economy, consumers and producers answer these questions through their spending and production decisions. In a command economy, the government makes the main decisions. Most real economies are mixed, combining elements of both systems.
在市场经济中，消费者和生产者通过支出和生产决策来回答这些问题。在指令经济中，政府做出主要决定。现实中的大多数经济体都是混合经济，结合了两种体制的元素。
5. Factors of Production | 生产要素
Economists group resources into four factors of production: land, labour, capital and enterprise. Land includes all natural resources such as water, minerals and forests. Labour refers to the human effort, both physical and mental, used in production. Capital consists of man-made tools, machinery and buildings that help produce other goods. Enterprise is the willingness to take risks and bring the other factors together to create value.
经济学家将资源分为四种生产要素：土地、劳动、资本和企业才能。土地包括所有自然资源，如水、矿产和森林。劳动是指生产中体力和脑力的付出。资本由人造的工具、机器和建筑物组成，这些帮助生产其他商品。企业才能则是承担风险并将其他要素结合起来创造价值的能力。
An entrepreneur who opens a bakery uses land (the shop), labour (bakers), capital (ovens and mixers) and her own enterprise. Understanding these categories helps explain why some countries produce more than others: they may have a richer endowment of one or more factors.
一位开办面包店的企业家会使用土地（店铺）、劳动（面包师）、资本（烤箱和搅拌机）以及她自己的企业才能。理解这些类别有助于解释为什么一些国家生产得比其他国家更多：它们可能拥有更丰富的某种或多种要素。
6. Introduction to Demand and Supply | 需求与供给简介
Demand represents the quantity of a product that consumers are willing and able to buy at different prices, while supply represents the quantity producers are willing to sell. The law of demand states that, all else being equal, as price rises, quantity demanded falls. The law of supply suggests that as price rises, quantity supplied rises.
需求代表消费者在不同价格下愿意且能够购买的产品数量，而供给代表生产者愿意出售的数量。需求定律指出，在其他条件不变时，价格上涨，需求量下降。供给定律则表明，价格上涨时，供给量上升。
These relationships can be shown on a diagram with price on the vertical axis and quantity on the horizontal axis. The demand curve slopes downward, and the supply curve slopes upward. Together they explain how markets find an equilibrium price.
这些关系可以用价格在纵轴、数量在横轴的图表表示。需求曲线向下倾斜，供给曲线向上倾斜。它们共同解释了市场如何找到均衡价格。
7. Markets and Prices | 市场与价格
A market is any place or mechanism that brings buyers and sellers together. It does not have to be a physical location; online platforms are markets too. Prices act as signals that coordinate the decisions of consumers and producers. When demand for a good increases and supply cannot keep up immediately, prices tend to rise, signalling producers to supply more.
市场是将买者和卖者聚集在一起的任何场所或机制。它不一定是实体地点；线上平台也是市场。价格作为信号，协调消费者和生产者的决策。当某种商品的需求增加而供给无法立即跟上时，价格往往会上涨，向生产者发出增加供应的信号。
Conversely, if producers supply more than consumers want to buy, prices tend to fall. This encourages consumers to buy more and discourages producers from overproducing. Adam Smith referred to this automatic adjustment as the ‘invisible hand’ of the market.
相反，如果生产者的供给超过消费者的购买意愿，价格往往会下降。这会鼓励消费者多买，并抑制生产者的过量生产。亚当·斯密将这种自动调节称为市场的“看不见的手”。
8. Money and Its Functions | 货币及其职能
Before money, barter was used, but it required a double coincidence of wants. Money solved this problem by serving three main functions. Firstly, money is a medium of exchange, meaning it is widely accepted as payment for goods and services. Secondly, it is a unit of account, allowing us to compare the value of different products. Thirdly, money acts as a store of value, so it can be saved and used later.
在货币产生之前，人们使用物物交换，但这需要双方需求的巧合。货币通过发挥三大职能解决了这一问题。首先，货币是交换媒介，意味着它在支付商品和服务时被广泛接受。其次，它是计价单位，使我们能够比较不同产品的价值。第三，货币充当价值储藏手段，因此可以储蓄并在以后使用。
Today, money takes many forms: coins, banknotes and digital balances. For money to be effective, it should be durable, portable, divisible and widely accepted. Inflation, however, can weaken the store-of-value function.
如今，货币有多种形式：硬币、纸币和数字余额。要使货币有效，它应该耐用、便携、可分且被广泛接受。然而，通货膨胀会削弱其价值储藏功能。
9. Specialisation and Trade | 专业化与贸易
Specialisation occurs when individuals, firms or countries concentrate on producing a limited range of goods or services rather than trying to be self-sufficient. By focusing on what they do best, they increase efficiency and output. Specialisation makes trade essential, because a specialist cannot consume all the goods they produce and needs others to obtain the goods they do not produce.
专业化是指个人、企业或国家专注于生产有限的商品或服务，而不是试图自给自足。通过专注于自身最擅长的领域，他们能够提高效率和产量。专业化使得贸易成为必需，因为专门化生产者无法消费自己生产的所有商品，需要与他人交换来获得自己不生产的商品。
A carpenter who builds furniture might exchange a table for vegetables grown by a farmer. Both benefit from the trade by obtaining goods they could not produce as efficiently themselves. This division of labour, as described by Adam Smith, boosts overall productivity.
一个制作家具的木匠可能会用一张桌子换取农民种植的蔬菜。两者都从贸易中受益，获得了他们自己无法同样高效生产的商品。这种分工，正如亚当·斯密所描述的，提高了整体生产力。
10. Personal Finance: Budgeting and Saving | 个人理财：预算与储蓄
Personal finance involves managing your income and expenditure. A budget is a plan that shows how much money you expect to receive and how you intend to spend it. Creating and sticking to a budget helps individuals avoid debt, achieve goals and prepare for unexpected expenses.
个人理财涉及对你的收入和支出进行管理。预算是显示你预期获得多少钱以及打算如何花费的计划。制定并遵守预算有助于个人避免债务、实现目标并为意外支出做好准备。
Saving means setting aside a portion of current income for future use. People save for various reasons: to buy a large item, to cope with emergencies or to build a retirement fund. Even small, regular amounts can grow over time thanks to compound interest.
储蓄意味着将现时收入的一部分留作将来使用。人们储蓄的原因多种多样：购买大件物品、应对紧急情况或建立退休基金。由于复利的作用，即使是小额的定期储蓄也能随着时间推移而增长。
Practical financial skills, such as distinguishing between needs and wants, recording expenses and comparing prices, are vital for good decision-making. These habits, developed early, lay the groundwork for a secure financial future.
实用的财务技能，如区分需要和想要、记录支出和货比三家，对于良好的决策至关重要。这些习惯尽早养成，将为未来财务安全打下基础。
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