Many transport and other service problems come down to simple network choices: what mode and/or route to take, if some of the routes and modes are congested and their use can be priced or not priced by different operators. The operators can have different objective functions: public or private...

The paper introduces the theory of optimal positioning of financial products. It is illustrated in the context of long-term intertemporal portfolio allocation and can be applied for example to asset allocation funds. We embed this problem in location theory: the portfolio is optimized within the...

Transportation networks, such as railways, roads and highways provide standard examples of natural monopolies. Since the introduction of the term “natural monopoly” by T. Malthus in 1815, this concept has been defined in different ways by several authors (F. Bastiat, J. S. Mill or L....

In this paper we examine empirically the market for local amenities in the Paris metropolitan region. We find first that there is considerable inequality in the spatial distribution of these local amenities, including accessibility, environmental and social indicators. We use a spatial...

A proposal has been made to build a new tunnel under the Scheldt River near the centre of Antwerp in order to relieve traffic congestion on the ring road and in an existing tunnel. The new tunnel is expected to cost more than €1 billion, and tolls have been suggested to help finance...

Product heterogeneity is introduced into the context of spatial pri ce discrimination. Many of the strong properties of the standard homogeneous goods case (which attains as a limit case here) are shown to no longer be valid. In particular, the social optimum is no longer sustainable as a market...

This paper proves the existence of a symmetric equilibrium with multiproduct firms using a nested logit model of demand. The demand model is parameterized by two variables that characterize different dimensions of preference for variety. These reflect intragroup heterogeneity and intergroup...