66The Court has also held that, in order to establish whether such a practice is abusive, that practice must have an anticompetitive effect on the market, but the effect does not necessarily have to be concrete, and it is sufficient to demonstrate that there is an anticompetitive effect which may potentially exclude competitors who are at least as efficient as the dominant undertaking (judgment in TeliaSonera Sverige, C‑52/09, EU:C:2011:83, paragraph 64).
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