📚 IGCSE Economics: How the Market System Works | IGCSE经济：市场经济体制运行原理
The market system is one of the most important ways in which an economy decides what to produce, how to produce it, and for whom to produce. It uses prices, demand and supply, and the choices of individuals and firms to allocate scarce resources.
市场体制是经济体决定生产什么、如何生产以及为谁生产的重要方式之一。它通过价格、需求与供给，以及个人和企业的选择来配置稀缺资源。
1. What is a Market System? | 什么是市场经济体制？
A market is any arrangement in which buyers and sellers can exchange goods and services. A market system is a way of coordinating these exchanges through prices. In a pure market economy, sometimes called a free-market economy, resources are owned by private individuals rather than by the government.
市场是买卖双方交换商品与服务的一种安排。市场经济体制是通过价格来协调这些交换的方式。在纯粹的市场经济，也称自由市场经济中，资源由私人拥有，而不是由政府拥有。
Consumers act in their own self-interest by trying to buy the goods they want at the lowest possible price. Producers act in their own self-interest by trying to maximise profit. The interaction of these two groups, through demand and supply, determines market prices and allocates resources.
消费者以自身利益为中心，尽量以最低价格购买想要的商品。生产者同样以自身利益为中心，努力实现利润最大化。这两类群体通过需求与供给的相互作用共同决定市场价格，并配置资源。
2. The Basic Economic Problem and Scarcity | 基本经济问题与稀缺性
Every economy faces the basic economic problem: human wants are unlimited, but the resources available to satisfy those wants are limited. This scarcity means that choices have to be made, and every choice involves an opportunity cost.
每个经济体都面临基本经济问题：人类欲望是无限的，但满足这些欲望的资源是有限的。稀缺性意味着必须做出选择，而每一个选择都涉及机会成本。
The market system helps make these choices by directing resources into the production of goods and services that consumers are willing to pay for. If a good is wanted strongly, its price tends to rise, and producers have an incentive to make more of it. In this way, the market system allocates scarce factors of production such as land, labour, capital and enterprise.
市场经济体制通过将资源引导到消费者愿意购买的商品与服务的生产上，帮助社会做出选择。如果某种商品被强烈需要，其价格就会趋于上升，生产者就有动力增加生产。通过这种方式，市场体制配置土地、劳动、资本与企业家才能等稀缺生产要素。
3. Demand and the Demand Curve | 需求与需求曲线
Demand is the willingness and ability of consumers to buy a quantity of a good at different possible prices over a given period of time. Effective demand requires both desire and purchasing power.
需求是指消费者在特定时期内，为购买一定数量商品所愿付出不同价格的意愿和能力。有效需求既需要购买意愿，也需要购买能力。
The law of demand states that, other things being equal (ceteris paribus), quantity demanded falls as price rises, and quantity demanded rises as price falls. This is why the demand curve slopes downward from left to right. Lower prices attract new buyers and allow existing buyers to afford more.
需求定律表明，在其他条件不变的情况下，价格上升则需求量下降，价格下降则需求量上升。因此需求曲线从左向右下方倾斜。较低的价格会吸引新的消费者，也使现有消费者能够购买更多。
A change in price causes a movement along the demand curve. A movement to the right along the curve is called an extension of demand, while a movement to the left is called a contraction of demand.
价格变化引起的是沿需求曲线的移动。沿曲线向右移动称为需求量的扩展，向左移动称为需求量的收缩。
The demand curve itself shifts when a non-price determinant changes. Important determinants include changes in consumer income, changes in taste, changes in the price of substitutes and complements, changes in population, and changes in expectations about future prices.
当非价格决定因素发生变化时，需求曲线本身会发生平移。重要的决定因素包括消费者收入变化、偏好变化、替代品与互补品价格变化、人口变化，以及人们对未来价格的预期变化。
4. Supply and the Supply Curve | 供给与供给曲线
Supply is the quantity of a good that producers are willing and able to sell at each possible price over a given period of time. The law of supply states that, ceteris paribus, quantity supplied rises as price rises, because higher prices offer higher revenue and profits.
供给是指生产者在特定时期内愿意且能够以不同价格出售的商品数量。供给定律指出，在其他条件不变时，价格上升则供给量增加，因为更高的价格带来更高的收益和利润。
The supply curve therefore slopes upward from left to right. A change in price causes a movement along the supply curve. A fall in price causes a contraction of supply, while a rise in price causes an extension of supply.
因此供给曲线从左向右上方倾斜。价格变化引起的是沿供给曲线的移动，价格下降导致供给量收缩，价格上升导致供给量扩展。
Supply can also increase or decrease because of non-price factors, which means the whole supply curve shifts. These factors include changes in costs of production, improvements in technology, changes in taxes and subsidies, changes in the price of related goods, changes in weather and production conditions, and changes in the number of firms in the market.
供给也会因非价格因素而增加或减少，这意味着整条供给曲线发生平移。这些因素包括生产成本变化、技术进步、税收与补贴变化、相关商品价格变化、天气和生产条件变化，以及市场上企业数量的变化。
5. Market Equilibrium: How Prices Are Determined | 市场均衡：价格如何决定
Market equilibrium occurs where the quantity demanded by consumers equals the quantity supplied by producers. At this price, the plans of buyers and sellers are consistent, and there is no tendency for the price to change, unless a demand or supply factor alters.
市场均衡出现在消费者需求量等于生产者供给量之处。在这个价格上，买卖双方的计划相互一致，除非需求或供给因素发生变化，否则价格没有变动的趋势。
At equilibrium: Qd = Qs, and the market clears.
Consider the following market schedule for a good.
假设某种商品的市场表如下。
| Price ($) | Quantity demanded | Quantity supplied | Market outcome |
|---|---|---|---|
| 2 | 50 | 10 | Shortage → price will rise |
| 4 | 40 | 25 | Shortage → price will rise |
| 6 | 30 | 30 | Equilibrium |
| 8 | 20 | 40 | Surplus → price will fall |
| 10 | 10 | 50 | Surplus → price will fall |
At a price below equilibrium, there is excess demand because consumers want more than producers are willing to supply. This shortage puts upward pressure on price. As price rises, consumers buy less and producers supply more, until equilibrium is restored.
当价格低于均衡价格时，会出现超额需求，因为消费者想购买的数量超过生产者愿意供给的数量。这种短缺会给价格带来上涨压力。随着价格上升，消费者购买减少，生产者供给增加，直到市场恢复均衡。
At a price above equilibrium, there is excess supply because producers supply more than consumers wish to buy. This surplus creates downward pressure on price. As price falls, supply contracts and demand expands, and the market returns to equilibrium.
当价格高于均衡价格时，会出现超额供给，因为生产者供给的数量超过消费者希望购买的数量。这种过剩会给价格带来下降压力。随着价格下降，供给收缩、需求扩展，市场重新回到均衡。
6. Movements along Curves vs Shifts | 沿着曲线移动与曲线平移
A common error in IGCSE economics is to confuse a movement along a curve with a shift of the whole curve. A change in the price of the good itself always causes a movement along both the demand and supply curves. A change in any non-price determinant causes the entire curve to shift.
在IGCSE经济学习中，一个常见错误是把沿曲线的移动与整条曲线的平移混为一谈。商品本身价格的变化总是引起需求曲线和供给曲线上的点移动，而任何非价格决定因素的变化都会使整条曲线移动。
| Type of change | Effect on demand | Effect on supply |
|---|---|---|
| Change in the good’s own price | Movement along the demand curve | Movement along the supply curve |
| Change in income, taste, related goods, etc. | Whole demand curve shifts | No shift in supply |
| Change in costs, technology, tax or subsidy | No shift in demand | Whole supply curve shifts |
For example, an increase in consumer income for a normal good shifts the demand curve to the right. At the original price, there is now excess demand, so price rises. A higher equilibrium price encourages producers to supply more, so the market moves along the original supply curve.
例如，对于正常商品而言，消费者收入增加会使需求曲线向右平移。在原来的价格上出现了超额需求，因此价格上升。较高的均衡价格鼓励生产者增加供给，于是市场沿原来的供给曲线移动。
7. The Signalling, Incentive and Rationing Functions of Price | 价格的信号、激励与配给功能
In a market system, prices perform three key functions: signalling, incentive and rationing. These functions are the core of the price mechanism.
在市场体制中，价格具有三大关键功能：信号功能、激励功能和配给功能。这些功能是价格机制的核心。
The signalling function means that prices convey information. A rise in price signals to producers that consumers want more of the good, or that the good has become relatively scarcer. A fall in price signals that demand is weak or that supply is plentiful.
信号功能是指价格传达信息。价格上涨向生产者表明消费者对商品的需求增加，或商品变得更加稀缺。价格下跌则表明需求疲软或供给充足。
The incentive function means that price changes create incentives for consumers and producers to change their behaviour. A higher price gives producers a strong profit incentive to supply more, while it encourages consumers to reduce consumption. A lower price encourages consumers to buy more, while it gives producers a reason to produce less.
激励功能是指价格变化为消费者和生产者提供改变行为的动力。更高的价格为生产者提供了扩大供给的利润激励，同时促使其减少消费。更低的价格鼓励消费者增加购买，也促使生产者减少供给。
The rationing function means that prices allocate scarce goods among consumers. When there is a shortage, the price rises until demand is reduced and the available supply is rationed to those who are willing and able to pay the higher price.
配给功能是指价格在消费者之间配置稀缺商品。当出现短缺时，价格上升，直到需求被抑制，现有供给被分配给那些愿意且能够支付更高价格的人。
In this way, the price mechanism solves the basic economic problem automatically. It directs resources away from products consumers no longer want and into products that consumers value most.
通过上述功能，价格机制自动解决了基本经济问题。它把资源从消费者不再需要的产品中转移出来，投入消费者最看重的产品中。
8. Advantages of the Market System | 市场经济体制的优势
A market system has several important advantages compared with a planned economy, in which the state decides production and prices.
与由政府决定生产与价格的计划经济相比，市场经济体制具有若干重要优势。
First, the price mechanism is automatic and flexible. There is no need for a complicated planning authority to collect information and issue orders. Prices adjust quickly when demand or supply conditions change.
第一，价格机制自动且灵活。市场不需要复杂的计划机构去收集信息和发布指令。当需求或供给条件变化时，价格会迅速调整。
Second, the market system promotes consumer sovereignty: consumers influence production through their spending decisions, because firms that fail to satisfy consumers will make less profit.
第二，市场体制促进消费者主权：消费者通过支出决策影响生产，因为不能满足消费者的企业利润会减少。
Third, competition gives firms incentives to reduce costs, improve quality and innovate. In order to survive and earn profit, firms must use scarce resources efficiently and respond to changing demand.
第三，竞争为降低成本、提高质量和创新的企业提供激励。为了生存和获利，企业必须有效利用稀缺资源并应对不断变化的需求。
Fourth, the market system allows private individuals to make their own choices. It encourages enterprise, risk-taking and individual responsibility, which can lead to economic growth and a greater variety of goods and services.
第四，市场体制允许个人做出自己的选择。它鼓励创业、承担风险和个人责任，从而推动经济增长，并提供更加多样化的商品与服务。
9. Disadvantages and Market Failure | 市场经济体制的缺陷与市场失灵
Despite its strengths, an unregulated market system can fail to allocate resources efficiently. This situation is known as market failure. When market failure occurs, the price mechanism sends incorrect signals, and too much or too little of a good may be produced.
尽管市场体制有诸多优点，但不受管制的市场也可能无法有效率地配置资源，这种情况称为市场失灵。当市场失灵时，价格机制会发出错误信号，导致某些商品生产过多或生产不足。
One important cause is the existence of externalities. For example, a factory that pollutes a river imposes costs on society that are not included in the private cost of production. As a result, the factory produces more pollution than is socially desirable.
一个重要原因是外部性的存在。例如，污染河流的工厂会给社会造成未被纳入私人生产成本的成本。因此，工厂产生的污染量会超过社会理想水平。
Public goods, such as national defence and street lighting, are another problem. They are non-excludable and non-rival in consumption, so private firms have little incentive to supply them. The market system would therefore under-provide these goods without government action.
公共物品，如国防和街道照明，是另一个问题。它们具有非排他性和非竞争性，私营企业几乎没有动力提供这些物品。因此，没有政府干预，市场体制就会供给不足。
The market system may also create inequality. People with higher incomes have greater influence, because they can bid up prices and buy more goods. Poorer households may be unable to afford essentials such as housing, education and healthcare.
市场体制也可能造成不平等。收入较高的人影响力更大，因为他们能够抬高价格并购买更多商品。较贫困的家庭可能买不起住房、教育和医疗等必需品。
Furthermore, firms may gain monopoly power. A monopolist can restrict output and raise price above the competitive level, reducing consumer welfare and causing an inefficient use of resources.
此外，企业可能获得垄断权力。垄断者可以限制产量并把价格提高到竞争水平之上，从而降低消费者福利并导致资源使用效率低下。
10. The Market System in the Real World: A Mixed Economy | 现实世界中的市场体制：混合经济
In reality, no country operates a completely pure market economy. Most economies are mixed economies, in which markets allocate most resources, but the government intervenes to correct market failure, provide public services and support those in need.
事实上，没有任何国家实行完全纯粹的市场经济。大多数经济体是混合经济：市场配置大部分资源，但政府采取干预措施以纠正市场失灵、提供公共服务并支持有需要的人。
Governments can intervene in many ways. They can impose taxes and subsidies to change prices, introduce regulations to limit pollution, provide public goods directly, set minimum and maximum prices, and use laws to promote competition.
政府可以通过多种方式干预。例如征收税收和发放补贴以改变价格，制定法规限制污染，直接提供公共物品，设定最低价格和最高价格，并通过法律促进竞争。
For IGCSE Economics, the key skill is to explain how the price mechanism allocates resources and then evaluate whether it works well. In many essay questions, you should show both the advantages and the disadvantages of relying on the market, and explain why governments may need to intervene.
对于IGCSE经济考试，关键技能是解释价格机制如何配置资源
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