Friend or foe: Customer-supplier relationships and innovation

This study provides an empirical investigation of the impact of customer-supplier relationships on firm innovation in an interorganizational framework encompassing transaction cost economics, resource dependence theory, and the theory of incomplete contracts. Using a sample of U.S. firms for the period from 1980 to 2005, this study explores how customer concentration and customer bargaining power affect a supplier's process innovation and product innovation measured with R&D-to-assets ratio and patents (also citations), respectively. The findings imply that a concentrated customer base, which reflects a strong customer-supplier relationship as well as high switching costs, motivates suppliers to invest more in R&D and become more innovative. However, the evidence also suggests that strong customer bargaining power creates hold-up problems and forces suppliers to invest less in R&D and innovation. The results are robust to sophisticated econometric techniques that control for endogeneity and suggest heterogeneous effects of business partnerships on firm innovation.