行业需求曲线表示市场上全体消费者愿意购买某种产品或劳务的数量与其价格之间的关系。
在垄断市场，需求曲线向下倾斜，这被称为行业需求曲线。
In a monopoly market the demand curve slopes downward which is known as the industry demand curve.
根据其定义，垄断者所面对的需求曲线(即是行业的需求曲线)是向下倾斜的。
By definition, the demand curve facing the monopolist is the industry demand curve which is downward sloping.
图5.7 (a)意味着行业的供给曲线为正斜率，因为与需求增加相应的价格(OE)要高于初始需求的价格(OE)。
Figure 5.7 (a) implies a positively sloped supply curve for the industry, since the price associated with the increased demand (OE) is higher than the price associated with the initial demand (OE ').
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