In the quasilinear case, surplus maximization leads to constrained efficient Drèze equilibria. We investigate the question of whether surplus maximization can be useful beyond the quasilinear case. We use two different surplus concepts, the equivalent and the compensating surplus. The first one...

We consider an oligopolistic market with a given finite number of price setting firms. We study the dependence of the market share of a firm on its own price and give conditions on the distribution of consumers' characteristics such that the profit of a firm becomes a quasiconcave function of...