R&D with spillovers: Monopoly versus noncooperative and cooperative duopoly

This paper compares industry profit and R&D propensity for a duopoly conducting either noncooperative or cooperative R&D and a monopoly, using two different basic models of strategic R&D. One postulates spillovers in R&D inputs and predicts that equilibrium joint profit and R&D levels are always larger under monopoly. The other postulates spillovers in R&D outputs and sometimes predicts that joint profit and R&D levels are larger under either of the alternative scenarios. In addition, unlike input spillovers, spillovers in R&D outputs sometimes exert a positive effect on both effective and private noncooperative R&D levels.