33The Court added that, in the absence of EU legislation, it is for the internal legal order of each Member State to lay down the conditions in which such interest must be paid, particularly the rate of that interest and its method of calculation (simple or ‘compound’ interest). Those conditions must comply with the principles of equivalence and effectiveness; that is to say that they must not be less favourable than those concerning similar claims based on provisions of national law or arranged in such a way as to make the exercise of rights conferred by the EU legal order practically impossible (judgment of 19 July 2012, Littlewoods Retail Ltd and Others, C‑591/10, EU:C:2012:478, paragraph 27 and the case-law cited).
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