This paper develops a simple demand model with network externalities which allow us to identify the shape of the network externalities function in the mobile telephone market and to estimate the critical mass. If the mobile telephone network exhibits positive network externalities, we expect...

This paper analyses how proportionality of the electoral system, political competition and corruption affect the total amount of Italian regional public consumption expenditure and alter the public budget structure. The Italian case is particular: from 1993 the country underwent a change in the...

The amount of financial incentives required to stimulate network growth depends on the size of the <italic>critical mass</italic> which, in its turn, depends on the intensity with which network externalities play their role in the diffusion process. The measurement of the strength of network effects and all that...