中文摘要：

考虑一个生产商和两个零售商之间的数量折扣问题，针对顾客需求量不确定时，生产商采用数量折扣策略鼓励零售商提高单次订货量，从而降低库存成本的决策问题，从在线算法与竞争分析的角度出发，结合零售商的议价能力这一因素，分别考虑两个零售商之间合作与非合作时的情形，设计了相应的平衡策略，并证明该策略为最优策略．

英文摘要：

A quantity discount problem between a manufacturer and two retailers was considered in this paper. For the demand of customer is uncertain, manufacturer adopted quantity discount policy to encourage retailers to increase the single order quantity thereby reducing inventory costs in decisionmaking problems. Combined with the retailer＇s bargaining power, the cooperation situation between the two retailers and non-cooperative situation from the perspective of online algorithm and competitive analysis were considered. The corresponding equilibrium strategy is designed. The conclusion that the strategy is the optimal strategy is proved.