Innovation spillover and merger decisions.

The merger–innovation nexus has been well studied in the theoretical literature, but empirical evidence, particularly on the spillover impacts of innovation, is limited. Merger decisions are influenced by a series of macroeconomic and behavioural factors; however, internalizing innovation spillovers and keeping a competitive edge may also explain merger activities. In this paper, we investigate the impact of innovation spillovers on the likelihood of firms to merge, using a combined panel data set of mergers among publicly traded US manufacturing firms from 1980 to 2003. Innovation is measured using R&D investments and citation-weighted patents, and innovation spillover is proxied using the technological proximity of firms and rivals' innovation. We include a series of control variables affecting merger decisions and address the potential endogeneity problem using previous R&D activities of firms. We find that innovative firms are on average more likely to merge. The results also show that within-industry inward spillovers increase the likelihood of mergers, but between-industry inward spillovers do not influence merger decisions significantly. Our main results are robust to alternative measures of innovation and spillovers as well as to different estimation methods such as propensity score matching. [ABSTRACT FROM AUTHOR]