126Lastly, it should be pointed out that the concept of a concerted practice, as it derives from the actual terms of Article 81(1) EC, implies, in addition to the participating undertakings concerting with each other, subsequent conduct on the market and a relationship of cause and effect between the two (judgment in T-Mobile Netherlands and Others, C‑8/08, EU:C:2009:343, paragraph 51 and the case-law cited).
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