We introduce a new class of quot;increasing elasticity of substitutionquot; (IES) preferences to model product differentiation. In a monopolistic competition setting a la Dixit - Stiglitz (1977) we find that, even under constant returns to scale and complete information, a rise in the number of...

We analize a market in the process of liberalization. Consumers are biased in favor of the incumbent firm and we assume that they can discover the true value of new suppliers only by switching. In an infinitely repeated game setting with Bertrand competition, we first show that efficient entry...