discount 2 a fixed credit period M if the order quantity is greater than or equal to a
predetermined quantity W. Likewise, a retailer in turn offers its customers a credit period N,
which has a positive impact on its demand but a negative impact on its default risks. In this
paper, we establish an inventory model for a retailer in a supply chain when a supplier offers
either a cash discount or a delay payment linked to order quantity; meanwhile it offers its …