Do resource differences between manufacturers and suppliers help or hinder product innovation of manufacturers? The moderating role of trust and contracts

It is a common practice of manufacturers to involve suppliers in new product development (NPD). Extant literature indicates that supplier integration has mixed effects on manufacturers' NPD and the contradicting findings result from either the external contingent factors or the tactical integration practices. We argue instead that the mixed effects are rooted in resource differences between manufacturers and suppliers. Further, we examine the functions of trust and contracts as the resource integration and coordination mechanisms to manage the effects of resource differences on product innovation of manufacturers. Based on a survey among 189 manufacturing firms, our research shows that resource differences follow an inverted U-shaped effect on product innovation of manufacturers and that trust strengthens while contract complexity attenuates the curvilinear relationship. As such, our research extends the existing body of literature to account for the divergent outcomes of supplier integration from the perspective of resource differences. Moreover, it demonstrates the double-edged effects of trust and contracts as devices of resource integration and coordination. Our research offers useful research and managerial implications.