简述寡头市场的经济效率。
①寡头市场上厂商在生产数堇和技术使用方面是缺乏效率的,但其存在竞争,因此其效率要比垄断市场高。②寡头市场上产品有差异,可满足消费者的不同偏好;寡头市场上有利于产品和技术革新。因此,寡头厂商又有有效率的方面。
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