📚 Year 9 AQA Economics: Summer Prep and Bridging Course | Year 9 AQA 经济学：暑期预习与衔接课程
Welcome to your summer bridging programme for Year 9 AQA Economics. This resource is designed to introduce you to the core ideas you will meet at the start of your GCSE Economics course. By working through these notes before September, you will build a strong foundation in the subject and feel confident to tackle topics such as scarcity, demand and supply, and how markets work. Take your time with each section – a little reading each week can make a huge difference later on.
欢迎来到 Year 9 AQA 经济学的暑期衔接课程。这份资料旨在为你介绍 GCSE 经济学课程开始时将会遇到的核心思想。通过在九月前学习这些笔记，你将建立起扎实的学科基础，并能自信地应对稀缺性、需求与供给以及市场运作等主题。每一节内容都不必急于求成——每周阅读一点点，就能在日后带来巨大的不同。
1. What is Economics? | 什么是经济学？
Economics is a social science that studies how individuals, firms and governments make choices when resources are limited. It is fundamentally about decision-making. Every choice we make involves weighing up the benefits against the costs, and economists try to understand and predict these choices using models and data.
经济学是一门社会科学，研究个人、企业和政府在资源有限时如何做出选择。它本质上关乎决策。我们做出的每一个选择都涉及权衡收益与成本，而经济学家则试图运用模型和数据来理解并预测这些选择。
The subject is usually divided into microeconomics – which looks at individual markets and the behaviour of consumers and firms – and macroeconomics, which focuses on the economy as a whole, including topics like inflation, unemployment and economic growth.
这门学科通常分为微观经济学和宏观经济学：微观经济学研究单个市场以及消费者与企业的行为；宏观经济学则着眼于整体经济，涵盖通货膨胀、失业和经济增长等议题。
2. Scarcity and the Basic Economic Problem | 稀缺性与基本经济问题
The basic economic problem is that human wants are virtually unlimited, yet the resources available to satisfy those wants are finite. This condition is called scarcity. Because of scarcity, we cannot have everything we desire, so choices must be made.
基本经济问题在于：人类的欲望几乎是无限的，但用来满足这些欲望的资源却是有限的。这种状况就被称为稀缺性。因为稀缺性的存在，我们无法拥有所有想要的东西，因此必须做出选择。
Scarcity forces every society to answer three fundamental questions: What goods and services should be produced? How should they be produced? And for whom should they be produced? The way a country answers these questions determines its economic system.
稀缺性迫使每个社会回答三个根本问题：应当生产哪些商品和服务？如何生产这些商品和服务？以及为谁生产？一个国家回答这些问题的方式决定了它的经济制度。
3. Opportunity Cost | 机会成本
Whenever we make a choice, the next best alternative we give up is called the opportunity cost. It is not simply the monetary cost, but the value of the foregone benefit. For example, if you decide to spend an hour revising economics instead of playing video games, the opportunity cost is the enjoyment you would have gained from gaming.
每当我们做出一个选择，我们所放弃的次优替代选项就叫做机会成本。它不仅仅是货币成本，而是所放弃的利益的价值。例如，如果你决定用一小时复习经济学而不是打电子游戏，那么机会成本就是你从游戏中本可获得的乐趣。
Understanding opportunity cost helps individuals, businesses and governments make better decisions. A government that chooses to build a new hospital may use funds that could have been spent on new schools; the opportunity cost is the education that is forgone.
理解机会成本有助于个人、企业和政府做出更好的决策。一个选择建造新医院的政府可能使用了原本可以用于建设新学校的资金；机会成本就是被放弃的教育投入。
4. Factors of Production | 生产要素
To produce goods and services, we need inputs – these are known as the factors of production. There are four main factors:
要生产商品和服务，我们需要投入——这些投入被称为生产要素。主要有四种要素：
Land – all natural resources used in production, such as oil, water, forests and fertile soil. The reward for land is rent.
土地——用于生产的所有自然资源，如石油、水、森林和肥沃的土壤。土地的报酬是地租。
Labour – the human effort, both physical and mental, involved in producing goods and services. The reward for labour is wages or salaries.
劳动——生产商品和服务所需的人力付出，包括体力和脑力。劳动的报酬是工资或薪金。
Capital – man-made resources used to produce other goods, such as machinery, tools and factories. The reward for capital is interest.
资本——用于生产其他商品的人造资源，如机器、工具和厂房。资本的报酬是利息。
Enterprise – the willingness and ability to take risks and combine the other factors of production to start a business. The reward for enterprise is profit.
企业——承担风险并组合其他生产要素以创办企业的意愿和能力。企业的报酬是利润。
5. Economic Systems | 经济制度
An economic system describes how a country organises the allocation of resources. The three main types are market economies, planned economies and mixed economies.
经济制度描述了一个国家如何组织资源的分配。主要的三种类型是市场经济、计划经济与混合经济。
In a market economy, decisions about what, how and for whom to produce are made largely by the interactions of consumers and firms through the price mechanism. The government’s role is minimal. The United States is often cited as an example, though no economy is purely market-based.
在市场经济中，关于生产什么、如何生产以及为谁生产的决策，主要依靠消费者与企业通过价格机制的相互作用来做出。政府的作用很小。美国常被引为例证，尽管没有哪个经济体是纯粹的市场导向。
In a planned economy, the government makes all key decisions about resource allocation and often owns most of the productive resources. North Korea is a contemporary example. Such systems aim for greater equality but often suffer from inefficiency and a lack of innovation.
在计划经济中，政府做出所有关于资源配置的关键决策，并且通常拥有大部分生产资源。朝鲜是一个当代例子。这类制度追求更大的平等，但往往面临效率低下和创新匮乏的问题。
Most countries today operate a mixed economy, where both the market and the government play important roles. The UK, for example, has private firms that respond to market signals, but the government also provides public goods like healthcare and education.
当今大多数国家实行混合经济，市场与政府都发挥着重要作用。以英国为例，私营企业响应市场信号，同时政府也提供医疗和教育等公共产品。
6. 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, over a given period of time. The law of demand states that, ceteris paribus (all other things being equal), as the price of a good rises, the quantity demanded falls.
需求指在一段给定时间内，消费者在各种价格水平上愿意且能够购买的商品或服务的数量。需求定律表明，在其他条件不变的情况下，当一种商品的价格上升时，其需求量会下降。
A demand schedule can help you see this relationship clearly. Below is a simple example for cinema tickets:
需求表能帮助你清晰地看到这种关系。以下是一张关于电影票的简单例子：
| Price per ticket (£) | Quantity demanded (tickets per week) |
|---|---|
| 12 | 50 |
| 10 | 80 |
| 8 | 120 |
| 6 | 180 |
Supply, on the other hand, is the quantity of a good or service that producers are willing and able to offer for sale at various prices. The law of supply says that as the price of a good rises, the quantity supplied also rises, because higher prices tend to increase profits and incentivise production.
另一方面，供给是指生产者在各种价格水平上愿意且能够出售的商品或服务的数量。供给定律指出，随着商品价格上升，供给量也会上升，因为较高价格往往能增加利润并激励生产。
7. Market Equilibrium | 市场均衡
A market is in equilibrium when the quantity demanded by consumers equals the quantity supplied by producers at a particular price. This is the price at which there is no tendency for change – it is often called the market-clearing price.
当消费者需求的数量与生产者供给的数量在某一特定价格上相等时，市场便处于均衡状态。这一价格是市场没有变动倾向的价格——通常被称为市场出清价格。
If the current price is above equilibrium, there will be excess supply (a surplus), putting downward pressure on price. If the price is below equilibrium, excess demand (a shortage) creates upward pressure. Through these adjustments, the market moves towards equilibrium without any central planning – a process Adam Smith famously described as the 'invisible hand'.
如果当前价格高于均衡价格，就会出现超额供给（过剩），对价格产生下行压力。如果价格低于均衡价格，就会出现超额需求（短缺），产生上行压力。通过这些调整，市场在没有中央计划的情况下趋向均衡——亚当·斯密将这一过程形容为“看不见的手”。
8. Price Elasticity of Demand (Introduction) | 需求价格弹性（入门）
Price elasticity of demand (PED) measures how responsive the quantity demanded of a good is to a change in its price. It is calculated using the formula:
需求价格弹性（PED）衡量一种商品的需求量对其价格变化的反应程度。其计算公式为：
PED = % Change in Quantity Demanded ÷ % Change in Price
If the answer is greater than 1 (ignoring the negative sign), demand is price elastic – consumers are very sensitive to price changes. If it is less than 1, demand is price inelastic – quantity demanded changes proportionally less than the price.
如果答案大于1（忽略负号），需求就是富有弹性的——消费者对价格变化非常敏感。如果小于1，需求就是缺乏弹性的——需求量的变化比例小于价格的变化比例。
Goods with many substitutes, like branded cereals, tend to have elastic demand. Necessities such as electricity or life-saving medicines tend to have inelastic demand because consumers cannot easily reduce consumption even when prices rise. Understanding elasticity helps firms predict how a price change might affect their total revenue.
拥有众多替代品的产品，比如品牌麦片，往往需求弹性较大。电力或救命药品等必需品通常需求缺乏弹性，因为即使价格上涨，消费者也难以轻易减少消费。理解弹性有助于企业预测价格变动将如何影响其总收入。
9. Market Failure and Government Intervention | 市场失灵与政府干预
Markets do not always work perfectly. When the price mechanism leads to an inefficient allocation of resources, economists say there is market failure. Common causes include externalities, public goods and information gaps.
市场并非总是完美运作。当价格机制导致资源配置无效率时，经济学家称存在市场失灵。常见的原因包括外部性、公共品和信息鸿沟。
An externality occurs when the actions of consumers or producers affect a third party who is not directly involved in the transaction. Pollution from a factory, for instance, imposes costs on local residents – a negative externality. Education can create positive externalities by benefiting the wider community through a more skilled workforce.
当消费者或生产者的行为影响到未直接参与交易的第三方时，就产生了外部性。例如，工厂污染给当地居民带来了成本——这是一种负外部性。教育能够通过提高劳动力技能使更广泛社区受益，从而产生正外部性。
To correct market failure, governments can intervene. They might impose taxes on products that generate negative externalities, such as sugary drinks or petrol, to reduce consumption. They may also provide subsidies for goods with positive externalities, like vaccinations, or directly fund public goods like street lighting that the free market would under-provide.
为纠正市场失灵，政府可以进行干预。它们可以对产生负外部性的产品（如含糖饮料或汽油）征税，以减少消费。政府也可以为具有正外部性的产品提供补贴，如疫苗接种，或直接资助街灯等自由市场会供应不足的公共品。
10. Introduction to Macroeconomics | 宏观经济学入门
While microeconomics zooms in on individual markets, macroeconomics looks at the big picture. It studies the performance, structure and behaviour of the entire economy. Key objectives for most governments include stable economic growth, low unemployment and low and stable inflation.
微观经济学聚焦于单个市场，而宏观经济学则着眼于全局。它研究整体经济的表现、结构和行为。多数政府的关键目标包括稳定的经济增长、低失业率以及低而稳定的通货膨胀。
Aggregate demand (AD) is the total spending on goods and services in an economy over a period of time. It consists of consumption by households, investment by firms, government spending, and net exports (exports minus imports). Changes in any of these components can push the economy into expansion or contraction.
总需求（AD）是指一段时期内经济中对商品与服务的总支出。它由家庭消费、企业投资、政府支出和净出口（出口减进口）组成。这些组成部分的任何变化都可能推动经济扩张或收缩。
11. Key Economic Indicators | 关键经济指标
To assess the health of an economy, economists and governments track several indicators. The three you will hear about most often are GDP, the unemployment rate and the inflation rate.
为了评估经济的健康状况，经济学家和政府会追踪若干指标。你最常听到的三个指标是 GDP、失业率和通货膨胀率。
Gross Domestic Product (GDP) measures the total value of all final goods and services produced within a country in a year. When GDP grows over time, it usually signals that the economy is expanding. If it shrinks for two consecutive quarters, the economy is said to be in a recession.
国内生产总值 (GDP) 衡量一国在一年内生产的所有最终商品与服务的总价值。如果 GDP 随时间增长，通常表明经济在扩张。如果连续两个季度收缩，则称经济处于衰退。
The unemployment rate is the percentage of the labour force that is actively seeking work but cannot find a job. High unemployment wastes human resources and can increase poverty and social problems.
失业率 是劳动力中积极寻找工作但找不到工作的人口所占的百分比。高失业率浪费人力资源，并可能加剧贫困与社会问题。
The inflation rate is the sustained increase in the general price level, calculated using the Consumer Prices Index (CPI) in the UK. A moderate inflation rate is considered normal, but very high inflation erodes purchasing power, while deflation can lead to falling demand and job losses.
通货膨胀率 指一般价格水平的持续上涨，在英国使用消费者价格指数 (CPI) 计算。温和通胀被视为正常现象，但过高的通胀会侵蚀购买力，而通缩则可能导致需求下降和失业。
12. Summer Study Tips for Year 9 Economists | 给 Year 9 经济学者的暑期学习建议
Economics is a subject that comes alive when you connect it to the real world. Over the summer, try to build a habit of reading a reputable news source at least twice a week. Look out for stories about interest rate decisions, trade disputes, or changes in petrol prices and ask yourself: what economic concepts might be at work here?
经济学在你将其与现实世界联系起来时变得生动活泼。暑假期间，试着养成每周至少阅读两次可靠新闻来源的习惯。留意有关利率决策、贸易争端或汽油价格变化的新闻，并问自己：这里可能涉及哪些经济学概念？
Make a simple glossary of the key terms introduced in this article – words like opportunity cost, elasticity, equilibrium and aggregate demand. Writing definitions in your own words is one of the best ways to cement your understanding. You could even create illustrated flashcards.
为本文介绍的关键术语制作一个简单的词汇表——例如机会成本、弹性、均衡和总需求等。用自己的话写定义是巩固理解的最好方法之一。你甚至可以制作图文并茂的闪卡。
Finally, try discussing economic ideas with family or friends. Explaining why cinema popcorn is so expensive or why your favourite coffee shop might raise its prices helps you practise using economic reasoning. Economics is everywhere – enjoy discovering it!
最后，试着与家人或朋友讨论经济学观点。解释为什么电影院里的爆米花那么贵，或者你喜欢的咖啡店为何可能提价，这都有助于你练习运用经济学推理。经济学无处不在——享受发现它的乐趣吧！
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