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In this paper, we discuss a paper of Chang and Teng [C.T. Chang, J.T. Teng, Retailer’s optimal ordering policy under supplier credits, Mathematical Methods of Operations Research 60 (2004) 471–483], they established an inventory model for deteriorating items when the supplier permits not only a cash discount but also a permissible delay. They also proved a closed-form solution of the inventory system...
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