50However, it should be pointed out that the validity of a European Union measure must be assessed on the basis of the facts and the law as they stood at the time when the measure was adopted and cannot depend on retrospective assessments of its efficacy. Where the European Union legislature is obliged to assess the future effects of rules to be adopted and those effects cannot be accurately foreseen, its assessment is open to criticism only if it appears manifestly incorrect in the light of the information available to it at the time of the adoption of the rules in question (see, to that effect, Case C-504/04 Agrarproduktion Staebelow [2006] ECR I-679, paragraph 38, and C-309/10 Agrana Zucker [2011] ECR I-7333, paragraph 45).
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