We develop a model of vertical innovation in which firms incur a market entry cost and position themselves in the quality space. Once established, firms compete monopolistically in the quality space, selling to consumers with heterogeneous tastes for quality. Exogenously growing productivities...

The inefficiencies related to endogenous product creation and variety under monopolistic competition are two-fold: one static—the misalignment between consumers and producers regarding the value of a new variety; and one dynamic—time variation in markups. Quantitatively, the welfare costs of...

The inefficiencies related to endogenous product creation and variety under monopolistic competition are two-fold: one static--the misalignment between consumers and producers regarding the value of a new variety; and one dynamic--time variation in markups. Quantitatively, the welfare costs of...