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Inventory Management for an Assembly System with Product or Component Returns

Author

Listed:
  • Gregory A. DeCroix

    (The Fuqua School of Business, Duke University, Box 90120, Durham, North Carolina 27708-0120)

  • Paul H. Zipkin

    (The Fuqua School of Business, Duke University, Box 90120, Durham, North Carolina 27708-0120)

Abstract

This paper considers an inventory system with an assembly structure. In addition to uncertain customer demands, the system experiences uncertain returns from customers. Some of the components in the returned products can be recovered and reused, and these units are returned to inventory. Returns complicate the structure of the system, so that the standard approach (based on reduction to an equivalent series system) no longer applies in general. We identify conditions on the item-recovery pattern and restrictions on the inventory policy under which an equivalent series system does exist. For the special case where only the end product (or all items used to assemble the end product) is recovered, we show that the system is equivalent to a series system with no policy restrictions. For the general case, we explain how and why the system becomes more problematic and propose two heuristic policies. The heuristics are easy to compute and practical to implement, and they perform well in numerical trials. Based on these numerical trials, we obtain insights into the impact of various factors on system performance. For example, we find that holding and backorder costs tend to increase when the average return rate, the variability of returns, or the number of components recovered increases. However, neither the product architecture nor the specific set of components being recovered seems to have a significant impact on these costs. Whether product recovery reduces total system costs depends on the magnitude of the additional holding and backorder costs relative to potential procurement cost savings.

Suggested Citation

  • Gregory A. DeCroix & Paul H. Zipkin, 2005. "Inventory Management for an Assembly System with Product or Component Returns," Management Science, INFORMS, vol. 51(8), pages 1250-1265, August.
  • Handle: RePEc:inm:ormnsc:v:51:y:2005:i:8:p:1250-1265
    DOI: 10.1287/mnsc.1050.0394
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    References listed on IDEAS

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