381As regards the substantive assessment of that ground of appeal, it must be borne in mind that the definition of the relevant market, in the application of Article 102 TFEU, is, as a general rule, a prerequisite for any assessment of whether the undertaking concerned holds a dominant position (see, to that effect, judgment of 21 February 1973, Europemballage and Continental Can v Commission, 6/72, EU:C:1973:22, paragraph 32), the objective being to define the boundaries within which it must be assessed whether that undertaking is able to behave, to an appreciable extent, independently of its competitors, customers and consumers (see, to that effect, judgments of 9 November 1983, Nederlandsche Banden-Industrie-Michelin v Commission, 322/81, EU:C:1983:313, paragraph 37, and of 30 January 2020, Generics (UK) and Others, C‑307/18, EU:C:2020:52, paragraph 127).
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