We develop a model to analyze the social optimality of growth and product variety. The model contains two sectors, one assembly sector producing a homogeneous consumption good and one intermediate goods sector producing differentiated inputs. Growth results from R&D performed in the intermediate...

This paper re-examines the Romer [1990] "knowledge driven" endogenous growth model in an open economy setting. As an alternative to Rivera-Batiz and Romer [1991], we consider trade between two absolutely identical countries that are characterized by imperfect competition in one of the trade...