A deterministic model for the transshipment problem of a fast fashion retailer under capacity constraints

Naderi, Siamak and Kılıç, Kemal and Daşcı, Abdullah (2020) A deterministic model for the transshipment problem of a fast fashion retailer under capacity constraints. International Journal of Production Economics . ISSN 0925-5273 (Print) 1873-7579 (Online) Published Online First http://dx.doi.org/10.1016/j.ijpe.2020.107687

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In this paper we present a novel transshipment problem for a large apparel retailer that operates an extensive retail network. Our problem is inspired by the logistics operations of a very large fast fashion retailer in Turkey, LC Waikiki, with over 475 retail branches and thousands of products. The purpose of transshipments is to rebalance stocks across the retail network to better match supply with demand. We formulate this problem as a large mixed integer linear program and develop a Lagrangian relaxation with a primal-dual approach to find upper bounds and a simulated annealing based metaheuristic to find promising solutions, both of which have proven to be quite effective. While our metaheuristic does not always produce better solutions than a commercial optimizer, it has consistently produced solutions with optimality gaps lower than 7% while the commercial optimizer may produce very poor solutions with optimality gaps as high as almost 300%. We have also conducted a set of numerical experiments to uncover implications of various operational practices of LC Waikiki on its system's performance and important managerial insights.
Item Type: Article
Uncontrolled Keywords: Logistics; Transshipment; Fast fashion retailing; Metaheuristic
Subjects: T Technology > T Technology (General)
Divisions: Sabancı Business School
Sabancı Business School > Operations Management and Information Systems
Faculty of Engineering and Natural Sciences > Academic programs > Industrial Engineering
Faculty of Engineering and Natural Sciences
Depositing User: Abdullah Daşcı
Date Deposited: 20 Sep 2020 13:05
Last Modified: 26 Apr 2022 10:19
URI: https://research.sabanciuniv.edu/id/eprint/40463

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