40As far as existing aid is concerned, it should be borne in mind that Article 108(1) TFEU gives the Commission the power, in cooperation with the Member States, to keep existing aid under constant review. That review may prompt the Commission to propose to the Member State concerned the appropriate measures required by the progressive development or by the functioning of the common market and, if necessary, to decide to abolish or alter aid which it considers to be incompatible with the common market.
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