under competition with non-deceptive counterfeiting and deceptive counterfeiting, respectively, as well as under monopoly …

I develop a new theory of marketing costs and introduce it into a model of trade with product differentiation and firm …

entry and product variety in a sticky-price model with monopolistic competition in which price stability would be optimal in …

We study the stochastic behavior of a dynamic general equilibrium model with monopolistic competition. Each seller …

, because they intensify price competition too much. Multi-product monopoly can lead to better design incentives than the non …-cooperative pricing that prevails under competition …

firm anticipates that its inventory or capacity may not be fully utilized, product variety can reduce its expected costs of …

and concentration and recovers shocks to entry costs. We validate our approach by showing that the model-implied entry … shocks correlate with independently constructed measures of entry regulation and M&A activities. We conclude that entry costs … have risen and that the ensuing decline in competition has depressed consumption by five to ten percent …