Purpose

This paper aims to consider a sustainable inventory model with price dependent demand, non-instantaneous deterioration rate, discount facility, partially backlogged shortages and advance and delay in payments for a two-warehouse system.

Design/methodology/approach

This model considered a non-instantaneous deterioration, which starts after a certain period with a constant rate. The deterioration rate in the rented warehouse is more compared to own warehouse. The proposed model focused on two things. The first one is to the benefits of the advance payments strategy and delayed payment for the retailer and supplier, where the two-warehouse system is available and the second one is using an appropriate discount facility on no of the installment to maximize the total profit. The classical optimization technique is used to solve the problem.

Findings

The combination of trade-credits and advance payments is initiated to provide more benefits to the retailer. The findings prove that advance payments, which are received from the retailer to the supplier are beneficial for the supplier, who can influence the demand increase because of higher lower selling prices. Decreasing the selling price is used as a catalyst to increase demand. It also extends the discount concept of Khan et al. (2019, 2019b).

Research limitations/implications

This model is limited by the fact that it does not consider variable deterioration. Therefore, the proposed inventory model could be extended by considering variable deterioration, as well as fully backlogged shortages and time-dependent demand function.

Originality/value

The study simultaneously considers a non-instantaneous deterioration inventory model, advance-payment, trade-credit for a sustainable two-warehouse inventory system. From the literature search to the best of knowledge no researcher has undergone this sort of study.

中文翻译：

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具有先进的支付政策和贸易信贷策略的两仓库库存系统的可持续库存系统

目的

本文旨在考虑一种具有价格依赖性需求，非瞬时恶化率，折扣机制，部分积压的短缺以及两仓库系统付款的提前和延迟的可持续库存模型。

设计/方法/方法

该模型认为是非瞬时劣化，它是在一定时期后以恒定速率开始的。与自己的仓库相比，租赁仓库的恶化率更高。提出的模型集中在两件事上。第一个是受益于预付款策略和对零售商和供应商的延迟付款，因为零售商和供应商都可以使用两个仓库的系统，第二个是对任何一个分期付款都没有使用适当的折扣工具，以使总利润最大化。使用经典的优化技术来解决该问题。

发现

贸易信贷和预付款的结合开始了，以便为零售商提供更多利益。研究结果证明，从零售商处向供应商收取的预付款对供应商而言是有利的，因为较高的较低的销售价格会影响需求的增长。降低售价被用作增加需求的催化剂。它还扩展了Khan等人的折扣概念。（2019，2019b）。

研究局限/意义

该模型由于没有考虑变量恶化而受到限制。因此，可以通过考虑变量恶化以及完全积压的短缺和时间依赖的需求函数来扩展建议的库存模型。

创意/价值

该研究同时考虑了非瞬时恶化库存模型，预付款，贸易信贷，以实现可持续的两仓库库存系统。从文献搜索到最好的知识，没有研究人员进行过此类研究。