In this paper, we consider an incumbent firm facing potential entry in a vertical differentiation model a la Mussa and Rosen where consumers differ only by their intensity of preference for quality. We ask whether the incumbent firm has the incentive to adopt a multi-product strategy in order to...

This paper considers a vertical differentiation model with positive network effects. It is based on the assumption that consumers belong to the same network if they buy products exhibiting close characteristics. Thus, the network has two characteristics: its intensity and its selectivity. The...

We analyze endogenous lobby formation within a slightly modified version of the "special interest politics" model of Persson (1998). In our model the interest groups hold different fixed endowments of an "infrastructure good" which is a complement in consumption of the local public good. For any...