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;...

Issues in antitrust enforcement / Johan Stennek -- Instruments for cartel deterrence, and conflicts of interests / C(c)Øecile Aubert -- Lessons for competition policy from the vitamins cartel / Matthew E. Raiff -- Effectiveness of antitrust sanctions on modern international cartels / John M....