The existence and the use of the essential facilities doctrine was questioned in theory and in practice. Although the doctrine was developed in antitrust, it became a frequently cited notion in the regulation of network utilities. Its relevance is hotly debated during the setup of the new...

Economists and lawyers are badly divided on issues concerning tying and bundling. Permissivie and prohibitive attitudes are changing radically in the literature and in the legal practice. After a short discurse on the notions, we introduce the basic ideas, theories and debates according to...