The results are as the following: 1. the best division points of demand interval in the case of two stage pricing and three stage pricing are respectively given.

其结果有二：第一，分别研究了垄断厂商二段、三段定价执行二级价格歧视的情形，并给出了需求区间的最优分段点；

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A purchase or production order that occurs at a regular interval and covers the variable demand during that period.

按固定时间间隔发出的采购或生产订单，包括期内变动需求。

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It inputs parameters such as lead time, customer demand inventory replenishment interval of the horizontal level of service and inventory costs. And some conclusions are drawn.

研究仿真模型的输入参数如订货提前期、客户需求间隔对横向补货库存系统服务水平、库存成本的影响，得到一些结论。

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In practice, the interval is much shorter, especially for signallers and engineers who are heavily in demand.

ECONOMIST: The army