24In the absence of EU rules governing the matter, it is for the domestic legal system of each Member State to lay down the detailed rules governing the exercise of the right to claim compensation for the harm resulting from an agreement or practice prohibited under Article 101 TFEU, including those on the application of the concept of ‘causal relationship’, provided that the principles of equivalence and effectiveness are observed (Manfredi and Others EU:C:2006:461, paragraph 64).
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