Purpose The purpose of this paper is to test the moderated-mediated model using a dataset drawn from 204 manufacturing firms in Australia, and Hayes' PROCESS macro software was used for analyzing the research model. Design/methodology/approach This study examines how firms can leverage the strategic value of their key supplier for improving their product performance by developing strategic collaborations with the key supplier as a mediating factor. Furthermore, it also seeks to understand the role that commitment plays in strategic relationships by testing how the mediating role of strategic collaboration is moderated by the level of buyer-suppliers relational capital. Findings The findings show that strategic collaborations mediate the relationship between the strategic value of key supplier and buyer's product performance, and the mediating effect is moderated by the relational capital between the buyer and the key supplier in such a way that the stronger the relational capital the stronger the indirect effect of strategic value of key supplier on buyer's product performance. Practical implications The findings show that firms could derive significant benefits from the strategic value of their key supplier in improving their product performance. However, the benefits can only be realized if firms can build successful strategic collaborations in the first place. At the same time, this study also demonstrates the importance of relational capital in terms of commitment and trust with the key supplier that influences the effectiveness of strategic collaborations in realizing the outcome of the collaborations. Originality/value This study addresses the gap in the literature by disentangling the complex relationship between a key supplier's strategic value and a buyer's product performance and the role that both collaboration and relational capital play in this relationship. By integrating strategic collaborations and relational capital of buyer-supplier relationships, this study not only confirms the links by testing key supplier's strategic value, strategic collaboration and product performance, but also extends the previous studies by incorporating the moderating role of relational capital as a contingent factor.
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