116Furthermore, it is settled case-law that the examination which it falls to the Commission to carry out, when applying the private operator principle, 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 10 December 2020, Comune di Milano v Commission, C‑160/19 P, EU:C:2020:1012, paragraph 100).
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