销售费用被作为决策变量。
讨论了容量、价格和销售数量三个决策变量与市场需求要素之间的关系；
The essential relation between the three decision variables (capacity, price and sold inventory) and passenger demand factor is discussed.
在前面定性分析基础上，分别建立生产型企业和销售型企业有需求提前期的库存优化模型，得出成本决策变量的最优解。
Based on the above qualitative analysis, it constructs an inventory optimizing model for manufacturer and storing company respectively, fingers out an optional result of the cost decision variable.
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