Drivers of Supplier Sustainability: Moving Beyond Compliance to Commitment

type="main" xml:id="jscm12067-abs-0001"> Mounting pressure for sustainable business practices has led to a greatly increased focus on highlighting sustainability drivers throughout the supply chain. While the literature has concentrated on why downstream original equipment manufacturers (OEMs) and retailers become “sustainable,” much less is known regarding why and how upstream suppliers implement sustainability practices. Based on findings from a cross-case analysis of eight first-tier (FT) suppliers and an integration of resource dependency theory (RDT), this study explores the drivers and mechanisms of FT supplier engagement in sustainable supply chain management. Suppliers need to understand the sustainability priorities of customers and stakeholders to derive the effective focus and depth of further upstream integration with subsuppliers. Therefore, the integration between the two functions that manage the relevant external interfaces, namely marketing (downstream and stakeholder communication) and procurement (upstream), appears to be the essential cornerstone to move beyond FT supplier compliance to actual commitment to sustainability practices. We present findings on how (1) stakeholder-related, (2) process-related, and (3) product-related drivers influence the choice and effectiveness of the procurement–marketing integration (PM integration) mechanisms. Stakeholder pressures are considered to be the principal drivers of sustainability efforts. However, on their own, they rarely provide sufficient grounds for permanent and embedded PM integration initiatives at FT suppliers. Evidence suggests that suppliers' commitment to PM integration is motivated by the opportunity to leverage sustainability initiatives in their product offerings and sustainability certificates recognizable by customers and secondary stakeholders.