Product design in monopolistic competition

We consider a model of monopolistic competition where producers can manipulate an elasticity parameter at an early stage. We interpret this as a choice of product specialization. Lower marginal costs of production lead to more generic products in all equilibria, which lead to fewer varieties under free-entry. Entry of a new firm increases overall specialization and increases prices, that is, the environment exhibits price-increasing competition. The loss of consumer surplus due to higher prices and lower consumption is compensated by the value of additional variety, hence entry also increases consumer surplus. Therefore, price-increasing competition need not be anticompetitive under endogenous specialization.