Supplier digital technology-oriented open innovation and buyer social sustainability in supply chains: the role of director network structure

Grounded in social exchange and social network theories, we study whether and how buyer firms’ social sustainability draws on their suppliers’ digital technology-oriented open innovation (DTOI). We focus on two dimensions of buyer social sustainability, namely societal and workforce sustainability, and examine the moderating role of buyers’ director network structure. Using panel data on Chinese listed firms from 2014 to 2024, we find that both dimensions are positively associated with supplier DTOI. These relationships are stronger for buyers whose director networks feature higher degree centrality, betweenness centrality, and structural holes, but not closeness centrality. We further explore how these relationships vary across relational, ownership, and industry contexts. Our findings extend digital innovation research to supply chains and clarify when supplier spillovers reach buyers.