This paper deals with the problem of determining the buyer's economic lot sizing policy for exponentially deteriorating products under trade credit. It is also assumed that the ordering cost consists of a fixed set-up cost and a freight cost, where the freight cost has a quantity discount offered due to the economies of scale. We formulate the mathematical model and the solution algorithm is developed based on the properties of an optimal solution.

Abstract
 I. Introduction
 II. Development of the mathematicaI model
 III. Determination of optimal policy
 IV. Conclusions
 References

• Shinn, Seong-Whan
• Song Chang-Yong