The role of power and trust in spreading sustainability initiatives across supply networks: A case study in the bio-chemical industry

This paper investigates how sustainability spreads across supply networks. Adopting an Industrial Marketing & Purchasing (IMP) Interaction Approach (Håkansson, 1982), we seek to understand sustainability spread as a change process that affects different supply network actors and the impact of power and trust on the spreading process. The paper reports on an in-depth case study of the development of a sustainability initiative in the bio-chemical industry, based on data collection with multiple supply network actors across several tiers, providing unique and rich insights into understanding sustainability spread in a supply network and the perceptions of multiple supply network actors on the role of power and trust on the spreading process. Data collection comprised 20 semi-structured interviews spanning eight supply network actors, supported by secondary data such as archival records. The case study indicates that both coercive and non-coercive power as well as trust, significantly impact the actors' engagement in sustainability initiatives and its wider spread in supply networks. The paper contributes to the literature on sustainable supply chain management and IMP research on sustainability spread and, in particular, provides insights on the impact of power and trust on the process of sustainability spread across dyadic relationships into the wider supply network.