A supply chain consisting of a single-supplier and a single-buyer is modeled and compared in two different modes: non-coordinated and coordinated. The model is established based on the fact that the demand is uncertain and shortages are considered as lost sales. The buyer’s order lead time is a nonlinear function of the buyer’s order size and the number of shipments from the supplier. Quantity ...

In this paper, we have proposed an improved genetic algorithm (GA) to solve constrained knapsack problem in fuzzy environment. Some of the objects among all the objects are associated with a discount. If at least a predetermined quantity of the object(s) (those are associated with a discount) is selected, then an amount (in $) is considered as discount. The aim of the model is to maximize the t...

Coordination between two different business entities is an important way to gain competitive advantage as it lowers supply chain cost. This paper reviews literature dealing with buyer vendor coordination models that have used quantity discount as coordination mechanism under deterministic environment and classified the various models. An effort has also been made to identify critical issues and...

Supplier selection and material procurement planning are the most important issues in supply chain management. This decision is complicated when the buyers face with discount price schemes. In real situation, each supplier may apply different methods such as different types of discount schedules and various types of payment in order to increase market share. In this situation, buyers try to sel...

An all-units discount is a price reduction applied to all units purchased if the customer’s total purchases equal or exceed a given quantity threshold. Since the discount is paid on all units rather than marginal units, the tariff is discontinuous and exhibits a negative marginal price (“cliff”) at the threshold that triggers the discount. This paper shows that all-units discounts arise in opti...

This paper examines the impact of group purchasing organizations (GPOs) on healthcare8 product supply chains. The supply chain we examine consists of a profit-maximizing manufacturer with a 9 quantity-discount schedule that is nonincreasing in quantity and ensures nondecreasing revenue, a profit10 maximizing GPO, a competitive source selling at a fixed unit price, and n providers (e.g., hospita...

In this study, we focus on a multi-stage supply chain system that operates under a JIT (just-intime) delivery policy. Kanbans play an important role in the information and material flows in a supply chain system. Thus, a kanban mechanism is employed to assist in linking different production processes in a supply chain system to implement the scope of JIT philosophy. We develop an optimal model ...

A manufacturer must choose whether to delegate component procurement to her tier-1 supplier, or control it directly. Due to information asymmetry about suppliers’ production costs and the use of simple quantity discount or price-only contracts, either delegation or control can yield substantially higher expected profit for the manufacturer. Delegation tends to outperform control when (1) the ma...