“…Third, we conceptualized R&D investment location decisions as individual decisions by multinational firms, which take into account whether there is a prior R&D unit in the country. Yet, multinational firms may take their entire global portfolio of R&D units into account when deciding on new R&D investment locations in a complex trade-off between scale, redundancy, and diversity (Kim, 2015;Kafouros et al, 2018;Belderbos, De Michiel, Lokshin, 2022). Future research could further develop such a portfolio approach to global R&D, in which preferably also a distinction is made between research on the one hand and development activities on the other hand (e.g., Kuemmerle, 1999;Belderbos et al, 2009).…”