The paper constructs a general equilibrium model model where the rate of technical progress and the distribution of R&D expenditure by heterogeneous research firms are simultaneously determined. Using the model, we explore the effects of the following policy measures on those two endogenous...

The paper develops a patent race model of firms which differ in R&D productivity. It is demon-strated that R&D subsidies generate the cleansing effect where relatively lower productivity firms drop out of the race and innovation accelerates due to expanded R&D investment by the remaining firms...