本文分別建立三種允許缺貨的退化性商品存貨模式，其中需求率與存貨水準有關，並考慮通貨膨脹與時間價值。本研究之主要目的，在於求出最佳之訂購次數和最佳之服務率，以使得在計畫期間內的存貨相關總成本為最低。為了解上述模式的求解過程，本文最後輔以數值範例來做說明、並進一步對此三種模式做比較。

In this paper, three allowing shortage inventory models for deteriorating items are established, where the demand rate is dependent on the inventory level. Furthermore the inflation and time-value of money are considered in these three models. The purpose of the paper is to determine the optimal number of replenishments and service rate to minimize total relevant costs over a finite time-horizon. Finally, three numerical examples are presented to illustrate the proposed models, and to identify the best alternative among these three.