Concavity of transportation costs has been rarely considered in the linear model of product differentiation, although it seems a reasonable assumption in many contexts. In this paper, we extend the results by Gabszewicz and Thisse (1986) about the existence of the sequential...

We investigate the features of optimal environmental policies composed of pollution standards and costly inspection processes, where fines for exceeding the standards depend both on the degree of transgression and the environmental technology that the firm uses to reduce the social impact of its...

We focus on the general linear-quadratic transportation costs in the linear model. Earlier results have shown that no pure-strategy price equilibrium exists for whatever firm locations in this context. Since there is no price equilibrium for the whole market, our first objective is to calculate...

This article considers a model of spatial competition where firms and consumers are located in a semicircular space rather than in the whole circle (Salop's model) or the linear city (Hotelling's model), under the assumptions of both, convex and concave, transportation costs. The paper tries to...