38Thus, according to the case-law of the Court, a method based on a comparison of prices applied in the Member State concerned with those applied in other Member States must be considered valid. It is apparent from that case-law that, when an undertaking holding a dominant position imposes scales of fees for its services which are appreciably higher than those charged in other Member States, and where a comparison of the fee levels has been made on a consistent basis, that difference must be regarded as indicative of an abuse of a dominant position (judgments of 13 July 1989, Tournier, 395/87, EU:C:1989:319, paragraph 38, and of 13 July 1989, Lucazeau and Others, 110/88, 241/88 and 242/88, EU:C:1989:326, paragraph 25).
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