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The present study deals with the modification of Wilson’s formulation by taking into account changes in the supply chain represented by the parameters of the model, namely varying delivery costs and price of goods stored. The four different models are presented. The proposed models avoid the main drawbacks of Wilson’s formulation—the constant price and reordering time—and discuss the case where varying parameters are used alongside discounting. The proposed models render lower costs under particular settings.

A New Model for Determining the EOQ under Changing Price Parameters and Reordering Time