Designing of a four-level closed loop Supply Chain Network with an Integration Approach for Economic, Environmental, and Social Responsibility about Employees

In this paper, a new mixed integer mathematical model is developed for desifning a sustainable closed loop supply chain management problem. In this model, some real world manufacturing features are taken into account like exonomical, environmental and social responsibility indexes. The main novelty of propose model the consideration of three key indexes of local and sustainable job opportunities and also creating new job opportunities in terms of social responsibility of a supply chain. Moreover, the greenness of a supply chain in terms of CO2 emmisions are investigated through the developed model. In order to evaluate and validate the proposed mathematical model, some numerical examples are generated randomly, and solved using the CPLEX solver on Gams optimization package. In addition, some magerials insightsd are included in the paper by performing deep sensitivity analysis of the esseintial parameters. Based on obtained results, considering all sustainbiliy aspects of a supply chain in a concurrent way can reduce costs, significantly.