of market structure; perfect competition models and monopolistic competition models. Benefit measured by perfect … competition based models is usually independent of economy of scale and therefore the policy assessment result is consistent with … is discussed from a point of view of efficiency. On the other hand, monopolistic competition based models is suitable to …

We propose a general model of monopolistic competition, which encompasses existing models while being flexible enough … to take into account new demand and competition features. Using the concept of Frechet differentiability, we determine a …