Peer effects in R&D investment based on interlock network: Evidence from China

Different from extant literature on peer effects within industries or locations, this study aims to investigate whether and why the R & D investment of a focal firm is influenced by that of interlocked peer firms. Using instruments based on intransitivity, we identify positive interlock-based peer effects in R & D investment. Firm-pair evidence corroborates the existence of peer effects by showing that interlocks render similar R & D policies and exogenous policy-induced fractures of interlocks lead to diverging R & D investments. Further analysis indicates that the interactive effects are more salient among firms with access to greater peer information and more severe information asymmetry, suggesting that peer effects are consistent with the information theory. Moreover, peers from different industries/places and focal firms with orientation to the differentiation strategy, embodying greater supply and demand of heterogeneous information, are associated with stronger peer effects. Finally, corporate patent outcomes and Tobin's Q positively react to peers' R & D investment, a sign that the interlockbased peer effects are beneficial to the performance of the focal firm.