58Next, it must be borne in mind that it is settled case-law that, for the purposes of applying Article 81(1) EC, the reason for defining the relevant market is to determine whether an agreement is liable to affect trade between Member States and has as its object or effect the prevention, restriction or distortion of competition within the common market (Case T-29/92 SPO and Others v Commission [1995] ECR II-289, paragraph 74; Joined Cases T-25/95, T-26/95, T-30/95 to T-32/95, T-34/95 to T-39/95, T-42/95 to T-46/95, T-48/95, T-50/95 to T-65/95, T-68/95 to T-71/95, T-87/95, T-88/95, T-103/95 and T-104/95 Cimenteries CBR and Others v Commission (‘Cement’) [2000] ECR II-491, paragraph 1093; and Volkswagen v Commission, paragraph 57 above, paragraph 230). Consequently, there is an obligation on the Commission to define the market in a decision applying Article 81(1) EC only where it is impossible, without such a definition, to determine whether the agreement, decision by an association of undertakings or concerted practice at issue is liable to affect trade between Member States and has as its object or effect the prevention, restriction or distortion of competition within the common market (Joined Cases T-374/94, T-375/94, T-384/94 and T-388/94 European Night Services v Commission [1998] ECR II-3141, paragraphs 93 to 95 and 105, and Volkswagen v Commission, paragraph 57 above, paragraph 230).
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