Monopolistic competition, as you like it

We explore monopolistic competition with asymmetric preferences over a variety of goods provided by heterogeneous firms, and compute equilibria (approximating Cournot Bertrand when market shares are negligible) through average Morishima elasticities substitution. Further results concerning pricing entry emerge under homotheticity demands depend on common aggregator, as Generalized Additively Separable preferences. Under additivity we can determine which going to be free entry, well the selection effects associated changes in size, consumers' income, aggregate productivity, preference parameters.