| Article ID: | iaor20102881 |
| Volume: | 36 |
| Issue: | 5 |
| Start Page Number: | 547 |
| End Page Number: | 550 |
| Publication Date: | Sep 2008 |
| Journal: | Operations Research Letters |
| Authors: | Huh Woonghee Tim, Janakiraman Ganesh |
| Keywords: | programming: dynamic |
We present a new proof of the optimality of echelon order-up-to policies in serial inventory systems, first proved by Clark and Scarf. Our proof is based on a sample-path analysis as opposed to the original proof based on dynamic programming induction.