Welfare-maximizing patent length in a dynamic general equilibrium model

Abstract

Abstract This article examines analytically the welfare-maximizing patent length in a dynamic general equilibrium model which is based on a variety expansion R&D-based growth model. The results show that if the elasticity of substitution among the intermediate goods is higher, that is, the price elasticity of demand is higher, the welfare-maximizing patent length is shorter. This article also examines the welfare-maximizing mix of patent length and breadth, and numerically obtains similar results, that is, a higher elasticity of substitution shortens the welfare-maximizing length.