在前人研究的基础上，考虑了运输成本和经济批量之间的内在联系，对传统VM I模型进行了完善。

Based on foregoing researches, this paper tries to perfect the traditional model of VMI by taking the correlation between transport costs and economic order quantity into account.

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铁路运输具有距离与规模两方面的经济性，铁路部门也一直把大批量中长途货物运输作为其目标市场。

Railway transport has both distance and scale economy, so the railway companies always regard large scale and long distance freight transport as their objective markets.

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