[eng] The paper analyzes the opening up of markets to competition in two regulated-utility markets with network-based technology. These allow for, experimentally, observing whether the new technologies are under indeed promoting competition. The central thesis is that the incumbent firms appear...

[eng] The two topics of the paper — contestability and predatory pricing — have in common that they have been used against antitrust policies.. After a short discussion of barriers to entry, the paper examines the special case of « ultra-free entry », which is the case of contestable...