Based on the case which retailers' market demand is unknown and product price falls, studying double periodic order quantity model about commodity retail price and ordering problem. Through the analysis, of the model,the maximum expected profit function of retailers is a concave func- tion,so as to prove the optimal retail price and optimal order quantity existence. And through the numer- ical experiments further testify the model is feasible in fact.%基于零售商未知市场需求和产品价格下降的情况下,研究双周期订单批量模型中商品定价和订购问题.通过模型分析,证明了零售商的最大期望利益函数是凹函数,从而证明了最优零售价格和最优订购量的存在性.并通过数值试验进一步验证了该模型在实际中的可行性.
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