An incumbent operator may engage in practices aimed at maintaining its customer base even in the context of a liberalisation process, but it must not resort to practices which, by exploiting the advantages of a legal historic monopoly, are likely to produce foreclosure effects on equally efficient competing undertakings, said Advocate General Athanasios Rantos in his Opinion of the Court of Justice of the European Union on Thursday 9 December (Case C-377/20).
Following the liberalisation of...