Open innovation communities (OICs) have been expanding the scope of enterprises’ innovation activities, and their effective functioning hinges on the ongoing knowledge contributions from users. However, the research on the impact of contractual governance mechanisms on users’ knowledge-contribution behaviors has yet to be further explored. In this study, we provide a comprehensive definition of implicit contracts in OICs, clarify their dimensions, investigate their impact on users’ knowledge contribution, and explore how users’ network posi...