When discount coefficient β is a constant, the strategy and the optimal ordering quantity in the case of several different price discounts are discussed.

This paper establishes a general inventory model with inter-substitution for maximizing profits and improves the existence of the models′ solution,and proposals a method to find the optimal order quantity.

Through comparing three situations,in which the optimal order quantity,optimal revenues and supplier\'s wholesale price will be different,it concludes that both supply chain efficiency and purchase price of PEM owner are lowest.

The graded mean intrgration representation was employed to determine the newsboy problem of optimal order quantity.

Aiming at the problems of stock management such as purchasing, manufacturing and distributing in supply chain with the multilevel series system in stock control as its research focus,the paper put forward a method of recursive search,by which the optimum ordering amount and control strategy were deducted.

Decision-making on feed quantity and order quantity in materials management

A model of the multi-period order quantity of two parties in the supply chain(SC) was established,discussing the multi-period order quantity in the two-level SC.

In this paper,by means of continual check of fixed order quantity and fixed order point,we establish a inventory control model in grain logistics system.

A Lot Sizing Game Model with One Vendor and Multiple Buyers under MTO;

Based on the non-linear quantity discount policy,a lot sizing coordination model is established.

So it is important to study vendor and purchaser for coordinating their lot sizing.