201The existence of very large market shares is highly important and the relationship between the market shares of the undertakings involved in the concentration and their competitors, especially those of the next largest, is relevant evidence of the existence of a dominant position. That factor enables the competitive strength of the competitors of the undertaking in question to be assessed (Hoffmann-La Roche v Commission, paragraph 195 above, paragraphs 39, 40 and 48, and Gencor v Commission, paragraph 195 above, paragraphs 201 and 202). Furthermore, a particularly high market share may in itself be evidence of the existence of a dominant position, in particular where the other operators on the market hold only much smaller shares (Case T-221/95 Endemol v Commission [1999] ECR II-1299, paragraph 134).
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