、完全垄断的含义与条件 (-)什么是完全垄断 This may seem a strange question because the answer seems obvious. a monopoly exists when there is only one firm in the industry But, whether an industry can be classed as a monopoly is not always clear. It depends on how narrowly the industry is defined. To some extent, the boundaries of an industry are arbitrary. What is more important for a firm is the amount of monopoly power it has, that depends on the closeness of substitutes produced by rival industries一、完全垄断的含义与条件 （一）什么是完全垄断 This may seem a strange question because the answer seems obvious. A monopoly exists when there is only one firm in the industry. But, whether an industry can be classed as a monopoly is not always clear. It depends on how narrowly the industry is defined. To some extent, the boundaries of an industry are arbitrary. What is more important for a firm is the amount of monopoly power it has, that depends on the closeness of substitutes produced by rival industries