We present a model in which the consumers' capacity to access a service provided on a network depends negatively on the price charged by the network owner per capacity unit. Several scenarios concerning the structure of the downstream service provision market are studied. First, a monopolist...

I show the uniqueness of equilibrium for a class of oligopoly models with strategic complements.Product differentiation models are considered in which the contraction mapping theorem cannotnecessarily be applied.

In a model of price competition single-product ¯rms compete for consumers. Consumerspurchase a variable quantity of one of the di®erentiated goods. The paper provides results onequilibrium existence when consumers are heterogeneous in their evaluation of the di®erentiatedgoods among each...

Consumer behavior in differentiated product markets can be specified following the Lancastriancharacteristics approach or following Hotelling´s approach of spatial competition. In the case ofunit demand I present a class of models of (heterogeneous) consumer behavior which can bewritten as...

In this paper we present a mixed duopoly model of supply function competition under uncertainty with product differentiation. We find that, regardless the nature of product heterogeneity, the best response of the private firm always arises as strategic complement. Contrary to this, state-owned...

Using the coefficient of cooperation, we analyse the effect of cost asymmetries on collusive agreements when firms are able to coordinate on distinct output levels than the unrestricted joint profit maximization outcome. In this context, we first investigate the extent to which collusive...

In this paper we characterize optimal punishments with detection lags when the market consists of n oligopolistic firms that compete à la Cournot. It is shown how in the presence of detection lags optimal punishments fail to restore cooperation as long as the number of lags increases. Moreover,...

We present experimental results from a series of sessions organized using the Power Market simulator; a software designed to realistically replicate the Spanish Electricity Market. In the experiments reported here we compare the status quo to two alternative treatments which represent...