Sustainable purchasing and supply management (SPSM) is a lever of sustainable development for companies and remains an interesting research issue that can be analysed from various perspectives. By considering the polymorphic concept of proximity as a theoretical support, this research studies the buyer–supplier dyad and aims to answer the following question. How does the diversity of buyer–supplier dyad relationships influence the SPSM of direct and indirect purchases within a manufacturing company?
The authors used a qualitative approach founded on a matrix analysis to describe buyer–supplier relationships through the prism of the proximity concept. The field of study consists in a single case with embedded units including a manufacturing company and a sample of 13 suppliers of direct and indirect purchases.
The research reveals diverse combinations of proximities that characterise relationships between a buyer and suppliers of several purchasing categories. This diversity of relational contexts influences SPSM in different ways. The authors highlight three SPSM approaches labelled contractual, relational and embedded and describe practices carried out with suppliers as part of the different relational profiles.
The research is developed in a single perspective. To ensure that it can be generalised, it should be applied in other contexts supported by new case studies.
The research provides practitioners with guidelines on building successful buyer–supplier partnerships in a sustainable view. The authors’ findings aid managerial decision-making by validating the necessity of adapting SPSM depending on buyer–supplier relational situations.
This paper offers an original study angle on buyer–supplier relationships based on a proximity analysis. The authors’ research confirms the variety of sustainable purchasing relationships underlined by the literature and can advance the portfolio approach to sustainable purchasing.
