Perakende operasyonlarında müşteri kaynaklı ürün ikamesi varlığında ürün portföyünün belirlenmesi

The problem of product assortment and inventory planning under custo-mer-driven demand substitution is analyzed and a model for this problem isdeveloped in this thesis. In addition, other realistic issues in a retail contextsuch as supplier selection, shelf space constraints, and poor quality procure-ment are also taken into account. The model is analyzed for three differentcases: (i) the deterministic demand, single-period case, (ii) the deterministicdemand, multi-period case, and (iii) the stochastic demand, single periodcase. The characteristics of optimal assortment for different substitutioncosts is examined for each case. Then, the performance of the modifiedmodels, which neglects customers substitution behavior, which excludes sup-plier selection decision, and which ignores shelf space limitations, are an-alyzed separately. The results of the analysis demonstrate that neglectingcustomer-driven substitution or excluding supplier selection or ignoring shelfspace limitations leads to inefficient assortments.Empirical analysis for some of the input parameters of the model is alsoperformed. During this analysis, we gather data on the substitution behaviorof the customers in regard of product categories and retailer choices.The main contribution of this thesis is the development of a practical andflexible model for retailer systems which results in optimal assortments interms of total profit of the system.1