In the homogenous good case, the relationship between market structure and efficiency was studied extensively. Assuming a standard quadratic utility with quantity competition, this paper carries on the analysis in a differentiated good context. It can be shown that there is a positive...

In the homogenous good case the impact of a marginal cost variation on consumer surplus, industry profits and social surplus was studied in extensive manner. Assuming quantity competition and a standard quadratic utility this paper carries on this analysis in a differentiated good context. In...