39However, it is also settled case-law that such an examination requires a complex economic assessment and that, in the context of a review by the Courts of the European Union of complex economic assessments made by the Commission in the field of State aid, it is not for those Courts to substitute their own economic assessment for that of the Commission (judgment of 20 September 2017, Commission v Frucona Košice, C‑300/16 P, EU:C:2017:706, paragraphs 62 and 63).
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