A Supply Chain Sourcing Model at the Interface of Operations and Sustainability

In this paper, we develop a supply chain sourcing model that incorporates both sustainability and operational performance measures. The model selects suppliers and determines sustainability investments and order allocations among the selected suppliers. High sustainability performance as well as cost efficiency are achieved while a high service level is maintained. We formulate the problem as a nonlinear bi-objective integer-programming model, discover the model’s special features, and propose an effective and computationally efficient algorithm to solve it. To quantify a supply chain’s sustainability performance, we adopt the Environmental, Social, and Governance (ESG) index. Instead of searching for just one sourcing solution, we find the Pareto optimal set of effective solutions. Numerical tests verify that our algorithm outperforms an existing sourcing algorithm in term of computational efficiency. A simulation of Apple’s sourcing decisions demonstrates the effectiveness of the model in business practice. Our work also provides managerial insights on how sustainable operations alter traditional supply chain sourcing decisions. It helps practitioners make fast and effective sourcing and investment decisions to implement their sustainability strategies at the operational level