Inventory Optimization for Multiple Perishable Products with Dynamic Pricing, Dependent Stochastic Demand, and Dynamic Reorder Policy

Inventory control is relatively difficult when the product is perishable, the demand is stochastic, the product life cycle is short, and the pricing policy is dynamic. Several prior studies utilized simulation approaches to deal with the high complexity, stochastic, and multi-factor nature of this problem. However, most previous studies considered only a single perishable product. In real life, there are many cases in which the stochastic demand for a perishable product is dependent on the stochastic demand for another perishable product. Therefore, this paper considers a multi-product inventory problem with stochastic and dependent demand under a dynamic pricing policy. Specifically, we consider a retail shop that sells two perishable products, where the demand for one product is stochastic and dependent on the stochastic demand for another product. Using Arena and its OptQuest tool, a simulation model is constructed and used to find the optimal values of the reorder-up-to-levels for both products in order to maximize the expected total profit. A case study is used to demonstrate the essential features of the model.