📚 GCSE Economics: Monopoly – Key Points Revision | GCSE 经济：垄断考点精讲
In microeconomics, market structure matters. Among the four main types – perfect competition, monopolistic competition, oligopoly, and monopoly – monopoly is the most extreme case of imperfect competition. Understanding how a monopoly works, why it can be both beneficial and harmful, and how governments attempt to regulate it is essential for GCSE Economics. This revision guide breaks down all the key concepts you need to master.
在微观经济学中，市场结构至关重要。在四大主要类型——完全竞争、垄断竞争、寡头垄断和垄断——当中，垄断是最极端的非完全竞争形式。理解垄断的运作方式、它为何既有好处又有坏处，以及政府如何尝试监管垄断，对于 GCSE 经济学的学习至关重要。这篇考点精讲将为你拆解所有需要掌握的核心概念。
1. What is a Monopoly? | 什么是垄断？
A monopoly exists when there is a single seller in the market that controls the entire supply of a good or service, and there are no close substitutes. The monopolist is a price maker, meaning it can influence the market price by adjusting output.
当市场上只有一个卖家控制着某种商品或服务的全部供给，并且没有近似替代品时，就存在垄断。垄断者是价格制定者，这意味着它可以通过调整产量来影响市场价格。
In the UK, a firm is often considered to have monopoly power if it has a market share above 25%, but a pure monopoly is a single firm dominating 100% of the market. GCSE specifications focus on the theoretical model of pure monopoly.
在英国，如果一家企业的市场份额超过 25%，通常会被认为具有垄断势力，但纯垄断指的是一家企业独占 100% 的市场份额。GCSE 考纲侧重于纯垄断的理论模型。
2. Characteristics of a Monopoly | 垄断的主要特征
There is a single seller. Only one firm produces the good or service, so the firm is the industry.
单一卖家。只有一家企业生产该商品或服务，因此企业即行业。
Unique product with no close substitutes. The monopolist's product is distinct and consumers cannot easily switch to alternatives.
独特产品，没有近似替代品。垄断者的产品具有差异性，消费者难以轻易转向替代品。
High barriers to entry. Other firms are prevented from entering the market due to legal, technical, or cost barriers.
高进入壁垒。由于法律、技术或成本壁垒，其他企业被阻止进入市场。
The monopolist is a price maker. Because it faces the market demand curve, it can set the price rather than take it from the market.
垄断者是价格制定者。由于它面临整个市场的需求曲线，它可以设定价格，而不是被动接受市场既定价格。
Imperfect information may exist. Consumers may not have full knowledge of alternatives or prices, reinforcing the monopolist's power.
可能存在不完全信息。消费者可能并不完全了解替代品或价格，这强化了垄断者的权力。
3. How Monopolies Form: Barriers to Entry | 垄断如何形成：进入壁垒
Barriers to entry are obstacles that make it difficult or impossible for new firms to enter a market. They are the fundamental reason monopolies can persist.
进入壁垒是指那些使新企业难以或无法进入市场的障碍。它们是垄断能够持续存在的根本原因。
Legal barriers: Patents, copyrights, and licences grant exclusive rights to produce a product. For example, a pharmaceutical firm might hold a patent on a new drug.
法律壁垒：专利、版权和许可证授予生产某种产品的排他性权利。例如，一家制药公司可能持有某种新药的专利。
Natural barriers (economies of scale): A large established firm can produce at a lower average cost than any potential entrant, making entry unattractive. This can lead to a natural monopoly.
自然壁垒（规模经济）：一家大型老牌企业能够以此任何潜在进入者更低的平均成本进行生产，从而使进入市场失去吸引力。这可能导致自然垄断。
Brand loyalty: Strong customer loyalty built through advertising and reputation can make it very hard for new firms to attract buyers.
品牌忠诚度：通过广告和声誉建立起来的强大客户忠诚度，可能使新企业很难吸引购买者。
Control of essential resources: Owning the only source of a raw material can block competitors. Historically, De Beers controlled much of the world's diamond supply.
控制关键资源：拥有某种原材料的唯一来源可以阻止竞争对手。历史上，戴比尔斯公司控制了世界大部分的钻石供应。
Predatory pricing: An established monopolist may temporarily lower prices to drive out new rivals, then raise them again later.
掠夺性定价：老牌垄断企业可能暂时降低价格，以挤走新竞争对手，随后再重新提价。
4. Monopoly Profit Maximisation | 垄断利润最大化
A profit-maximising monopolist produces the output where marginal revenue (MR) equals marginal cost (MC). This is the same rule as for perfectly competitive firms, but because the monopolist faces a downward-sloping demand curve, price exceeds MR.
利润最大化的垄断者会在边际收益（MR）等于边际成本（MC）的产量水平上进行生产。这与完全竞争企业的规则相同，但由于垄断者面对的是向下倾斜的需求曲线，价格高于边际收益。
Profit-maximising condition: MR = MC
利润最大化条件：MR = MC
Once the quantity is determined, the monopolist charges the highest price consumers are willing to pay for that quantity, read off the demand curve. This results in supernormal profit in the long run, protected by barriers to entry.
一旦确定了产量，垄断者就会按照需求曲线上对应于该产量、消费者愿意支付的最高价格来定价。这导致在进入壁垒的保护下，长期存在超额利润。
emand curve. The shaded area between price and average cost represents supernormal profit.
图形解读：在垄断图中，价格位于 MR=MC 的正上方，垂直对应到需求曲线。价格与平均成本之间的阴影区域代表超额利润。
5. Comparing Monopoly and Perfect Competition | 垄断与完全竞争对比
locative efficiency. In monopoly, price is greater than marginal cost (P > MC), meaning the monopolist restricts output and charges a higher price.
在完全竞争中，价格等于边际成本（P = MC），从而实现配置效率。在垄断中，价格大于边际成本（P > MC），这意味着垄断者限制产量并收取更高的价格。
Perfectly competitive firms are price takers with no market power; a monopolist is a price maker with significant market power.
完全竞争企业
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