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An analysis of optimal ordering policies for a two-supplier system with disruption risk

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  • Luo, Sha
  • Ahiska, S. Sebnem
  • Fang, Shu-Cherng
  • King, Russell E.
  • Warsing, Donald P.
  • Wu, Shuohao

Abstract

We study a single-product, periodic-review inventory system with the presence of fixed ordering cost. There are two suppliers: One is perfectly reliable while the other offers a cost advantage but is subject to possible supply interruptions. We present a theoretical framework with mathematical proofs for the optimal ordering policy in the finite-horizon setting, which exhibits an (s,S) structure, but with multiple, sometimes overlapping, reorder points and order-up-to levels. Then, we analyze the limiting behavior of our (s,S) policy and show that both the optimal cost and ordering policy parameters converge over time. This steady-state (s,S) policy characterizes the optimal sourcing strategy for the infinite-horizon setting. Through computational studies, we investigate the effects of parameter changes on the optimal policy and demonstrate that our two-supplier (s,S) ordering policy is optimal under a wide range of system parameters beyond the conditions required in the optimality proof.

Suggested Citation

  • Luo, Sha & Ahiska, S. Sebnem & Fang, Shu-Cherng & King, Russell E. & Warsing, Donald P. & Wu, Shuohao, 2021. "An analysis of optimal ordering policies for a two-supplier system with disruption risk," Omega, Elsevier, vol. 105(C).
    • Handle: RePEc:eee:jomega:v:105:y:2021:i:c:s0305048321001262
    DOI: 10.1016/j.omega.2021.102517
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