47The concept of a dominant position is defined in settled case-law as a position of economic strength enjoyed by an undertaking which enables it to prevent effective competition being maintained on the relevant market by giving it the power to behave to an appreciable extent independently of its competitors, customers and ultimately of its consumers. In general the existence of a dominant position derives from a combination of several factors which, taken separately, are not necessarily decisive (see, in particular, the judgments in Case 27/76 United Brands v Commission [1978] ECR 207, paragraphs 65 and 66, and Case T-30/89 Hilti v Commission [1991] ECR II-1439, paragraph 90).
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