Economic Modeling of a Multi-objective Sustainable Supplier Selection Problem (Case Study: Engine Oil Industry)

In this paper, a fuzzy multi-objective sustainable model is presented to select and allocate the order to supplier in uncertainty conditions and in a multi-period, multi-source, and multi-product cases at two levels of supply chain with pricing considerations. First objective function considered in this study as the measures to evaluate the suppliers are the purchase, transportation, and ordering costs. Second objective function considered employment rate and third objective function considered pollution rate. Employment and pollution rate parameters in the model are considered as uncertain and random triangular fuzzy number. A case study in engine oil industry in Zanjan province considered and the epsilon-constraint method is used to solve the small size of this problem and sensitivity analysis is conducted to examine the accuracy and validity of the proposed method.