Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We study a nontournament R&D duopoly. Before the standard R&D investment and quantity‐setting stages, we consider a stage in which firms choose their R&D technologies. Spillovers negatively depend on R&D technology differentiation. We show that, in equilibrium, firms will choose identical or very similar R&D processes. Such equilibria may entail less differentiation than would be dictated by social welfare maximization.