33The Court has indeed held that the presumption of a causal connection between a concertation and the market conduct of the undertakings participating in the practice, according to which those undertakings, where they remain active on that market, take account of the information exchanged with their competitors in determining their conduct on that market, follows from Article 101(1) TFEU and consequently forms an integral part of the EU law which the national court is required to apply (see, to that effect, judgment in T-Mobile Netherlands and Others, C‑8/08, EU:C:2009:343, paragraphs 51 to 53).
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