Abstract

The paper analyzes a multi-item inventory system, using independent (R,Q) policies. The aim is to minimize the average stock level while keeping a weighted (across items) fill rate service level at a given target. The paper explores whether the optimal order sizes and the optimal safety factors are aligned with the ABC classification. Our results show that A items should be ordered more frequently followed by B items and C items. Concerning the optimal safety factors, our results depend on the weights applied in the specification of the weighted service level. If all items have equal weight, A items should have the lowest safety factors followed by B and C items. If the weights are the demand rates, the ranking of the safety factors follows the ratios between the demand rate and the unit purchase price, and the higher this ratio is, the higher is the optimal safety factor. However, this ranking is completely aligned with the ABC classification given that the demands are transformed into monetary units.

摘要

本文分析了一个多项目库存系统，使用独立的(R,Q)政策。目的是最小化平均库存水平，同时将加权（跨项目）填充率服务水平保持在给定目标。该论文探讨了最佳订单大小和最佳安全系数是否与 ABC 分类一致。我们的结果表明，应该更频繁地订购 A 项，其次是 B 项和 C 项。关于最佳安全系数，我们的结果取决于加权服务水平规范中应用的权重。如果所有物品的重量相等，则 A 物品的安全系数最低，其次是 B 和 C 物品。如果权重是需求率，安全系数的排序遵循需求率与采购单价的比值，该比值越高，最优安全系数越高。然而，