This paper questions whether competition can replace sector-specific regulation of mobile telecommunications. We show that the monopolistic outcome may prevail independently of market concentration when access prices are determined in bilateral negotiations. A lighthanded regulatory policy can...

We analyse competition between perfectly substitutable networks. Monopolization can be sustained in equilibrium by asymmetric access prices whereby entry is deterred by a set of margin squeezes. A regulatory package consisting of (i) mandatory interconnection; (ii) reciprocal access prices;...

I generalize the workhorse model of network competition (Armstrong, 1998; Laffont, Rey and Tirole, 1998a,b) to include income effects in call demand. Income effects imply that call demand depends also on the subscription fee, not only on the call price. In the standard case of differentiated...