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Inventory Cost Rate Functions with Nonlinear Shortage Costs

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  • Kaj Rosling

    (Department of Industrial Engineering, Växjö University, SE-351 95 Växjö, Sweden)

Abstract

This article considers five cost-rate models for inventory control, each summarizing the expected holding and shortage costs per period as a function of the inventory position. All models have linear holding costs and shortage cost coefficients of dimension [ $/unit/period ], [ $/unit ], and [ $/period ]. The latter two coeficients may be the shadow costs of a fill-rate and a ready-rate service constraint, respectively. One of the cost-rate models is a new suggestion, intended to facilitate modeling of periodic-review inventory systems.If-and-only-if conditions on the demand process are presented for which the cost rate is quasi-convex in the inventory position. The typical sufficient condition requires that the cumulative demand distribution be logconcave, a condition that is met by most demand distributions commonly used in the inventory literature.The results simplify optimization and extend the known optimality of ( S , s ) and ( nQ , r ) policies to cost structures common in applications and to the presence of typical service constraints. As a prerequisite for the study, a series of new monotonicity results are derived for compound renewal processes.

Suggested Citation

  • Kaj Rosling, 2002. "Inventory Cost Rate Functions with Nonlinear Shortage Costs," Operations Research, INFORMS, vol. 50(6), pages 1007-1017, December.
    • Handle: RePEc:inm:oropre:v:50:y:2002:i:6:p:1007-1017
    DOI: 10.1287/opre.50.6.1007.346
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    References listed on IDEAS

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