📚 Monopoly: Market Power, Efficiency and Policy | 垄断：市场势力、效率与政策
In A-Level Economics, monopoly is one of the core market structures examined by Cambridge International. It sits at the opposite end of the spectrum from perfect competition and is essential for understanding market failure, pricing behaviour, efficiency losses and the rationale for government regulation.
在 A-Level 经济学中，垄断是剑桥国际考试考查的核心市场结构之一。它与完全竞争处于市场谱系的两端，对于理解市场失灵、定价行为、效率损失以及政府监管的理由至关重要。
1. Defining Monopoly | 垄断的定义
A pure monopoly exists when a single firm supplies the entire market output, meaning the firm is the industry and there are no close substitutes.
纯粹垄断指一家企业供给整个市场的全部产量，即企业就是行业，且没有近似替代品。
In practice, Cambridge Economics defines a monopoly more broadly as any firm with dominant market power, often indicated by a market share of 25% or above, and the ability to act as a price maker rather than a price taker.
在实践中，剑桥经济学将垄断更宽泛地定义为任何拥有主导市场势力的企业，通常以 25% 或以上的市场份额为标志，并能够作为定价者而非价格接受者行事。
This distinction matters because few true pure monopolies exist, but many firms behave like monopolists within their specific markets.
这一区分很重要，因为真正的纯粹垄断很少存在，但许多企业在其特定市场中表现得像垄断者。
2. Characteristics and Barriers to Entry | 特征与进入壁垒
Monopolistic markets are identified by several key characteristics: a single dominant seller, high barriers to entry, price-making ability, imperfect information and profit-maximising behaviour.
垄断市场可由几个关键特征识别：单一主导卖方、高进入壁垒、定价能力、信息不完全以及利润最大化行为。
Barriers to entry are the structural, legal or strategic obstacles that prevent new firms from entering the industry.
进入壁垒是阻止新企业进入行业的结构性、法律性或策略性障碍。
- Legal barriers such as patents, licences and copyrights give an exclusive right to produce.
- Econom
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