37As regards, first, the EU competition rules, although it is true that, in themselves, Articles 101 TFEU and 102 TFEU are concerned solely with the conduct of undertakings and not with laws or regulations emanating from Member States, those provisions, read in conjunction with Article 4(3) TEU, which lays down a duty to cooperate, none the less require Member States not to introduce or maintain in force measures, even of a legislative or regulatory nature, which may render ineffective the competition rules applicable to undertakings (see Case 13/77 GB-Inno-BM [1977] ECR I-2115, paragraph 31; Case C-198/01 CIF [2003] ECR I-8055, paragraph 45 and the case-law cited; and Case C-338/09 Yellow Cab Verkehrsbetrieb [2010] ECR I-13927, paragraph 25).
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