Abstract： This paper discussed the single buyer’s optimal purchasing decision in two-period when facing opportunity constraints of service level. By constructing a model, the optimal ordering policy and the analytical solution to the optimal objective value were proposed. Numerical analysis was conducted of the parameters in the model. Meanwhile, a comparison was made between the proposed model and the single period newsvendor problem with service level constrain in the literature. Finally, the impacts of the variation of parameters of these two models on optimal objective value and solution were analyzed.
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