Conclusions
There is a shortage of empirical research on social sustainability in supply chains, including its antecedents (Marshall et al., 2015a). Within SCM, research often takes a deterministic perspective, suggesting that external factors have a significant impact on the sustainability choices a manager makes, through pressures to appear legitimate (Marshall et al., 2015a). This has led to a rise in institutional theory-oriented research on sustainable SCM, examining how institutional pressures impact the adoption of sustainable practices. However, more research has been called for on the “supply-side factors” of the diffusion process of new practices (Ansari et al., 2010). We have contributed to this literature through our empirical investigation of the role of social sustainability assessment initiatives in institutionalizing said assessments in supply chains.
We witness the assessment initiatives directly, but mainly indirectly via other actors and stakeholders, exerting pressures on companies to adopt social sustainability assessments in their supply chains. Specifically, depending on its position and resources, an assessment initiative will either target a company directly with coercive pressures or indirectly with coercive, normative and/or mimetic pressures through other actors in the supply chain or external parties such as the media. Based on our study, we propose that these institutional pressures thus form a chain of their own. This finding has important implications for how the institutionalization of (socially sustainable) supply chain practices should be studied in the future. Based on these findings, we offer three important future research avenues for sustainable SCM scholars (as detailed in Table IV). The proposed research directions contribute to shaping future social sustainability-focused SCM research. Our findings demonstrate the importance of opening up and examining the “black box” of institutional pressures exerted on supply chains, and understanding the different parties involved in shaping company practices. For example, our findings demonstrate the important role of consumers and media in the chain of institutional pressures for social sustainability; these parties are not often (explicitly) included in empirical research regarding the adoption of sustainability practices by companies. Furthermore, given the extensive use of simple proxy or grouped measures of institutional pressures in survey studies in the supply chain field (Kauppi, 2013), our findings suggest that researchers examining the adoption of sustainable SCM practices need to develop a more fine-grained understanding of how companies are being influenced through chains of pressures.