43As is apparent from the Court’s settled case-law, although Article 101 TFEU is concerned solely with the conduct of undertakings and not with laws or regulations emanating from Member States, that article, read in conjunction with Article 4(3) TEU, which lays down a duty of cooperation between the European Union and the Member States, none the less requires the latter 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 (judgment of 4 September 2014, API and Others, C‑184/13 to C‑187/13, C‑194/13, C‑195/13 and C‑208/13, EU:C:2014:2147, paragraph 28 and the case-law cited).
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