随着零售业集中化趋势不断增强和大型零售商不断涌现，零售商买方势力日益突出。

With the ongoing concentration of retailing markets and the emergence of increasingly large-sized retail outlets, there has been significant buyer power of retailers.

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分析表明：当零售商仅具有买方垄断势力时，收取通道费会使零售商的利润增加，消费者剩余减少，对社会福利的影响取决于需求函数性质；

Analysis showed that:the case that the retailer both have the buyer and seller power, its welfare losses bigger than the case that only have the seller;

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