将结果传递给sum函数，从而求出某个类别的所有客户的总销售额。
The result is passed to the sum function to get the total over all customers for that particular category.
Web服务是适于销售的函数，可以使用任何平台和任何编程语言访问它们。
Web services are sellable functions that can be accessed independent of platforms and programming languages.
一个垄断者可以直接选择价格，或者通过选择销售数量来间接调控价格。 因为成本是数量的函数，所以利用数量而不是价格会使得计算简单点。
但销售反应函数的研究仍徘徊在基于可见确定因素的静态模型中，缺少对不确定竞争因素的进一步分析，使它的应用受到了限制。
But the research of sales response function stays at static model based on certain factor. The research is lack of further analysis of uncertain competitive factors, so its application is limited.
建立了商品销售中的凸需求函数，凸分布和多种价格并存的优化模型。
Convex function of demand, convex distribution of price and an optimal model for coexistence of multi-prices are established.
广告成本与产品销售量之间，即弥补广告成本所需增加的最低销售量的增量之间存在函数关系。
Between this cost and sale, in other words, between the advertising cost and minimum amount of sale increased in order to make up this cost, there exists a functional relation.
算例分析表明：最优价格是初始库存的递减函数，是潜在购买率和销售时间段的递增函数；
Simulation shows that the optimal price is a decreasing function of initial inventory and an increasing function of sale period and potential buying probability;
算例分析表明：最优价格是初始库存的递减函数，是潜在购买率和销售时间段的递增函数；
Simulation shows that the optimal price is a decreasing function of initial inventory and an increasing function of sale period and potential buying probability;
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