| Article ID: | iaor20083810 |
| Country: | Netherlands |
| Volume: | 35 |
| Issue: | 6 |
| Start Page Number: | 767 |
| End Page Number: | 772 |
| Publication Date: | Nov 2007 |
| Journal: | Operations Research Letters |
| Authors: | Erhun Feryal, Yazlali zgr |
We consider two classes of problems in the supply chain management literature: the multiple supply problem and quantity flexibility contracts. We identify the similarities between these two problems and show that for both the total operating cost of the manufacturer is convex with respect to its arguments under mild conditions.