51As regards the influence of the liberalisation of the market concerned on the assessment of the existence of aid, it must be borne in mind that State aid is liable to affect trade between Member States and to distort or threaten to distort competition, even though the market concerned is only partially open to competition. In order for an intervention by the State or through State resources to be liable to affect trade between Member States and to distort or threaten to distort competition, it is sufficient that, at the time of the entry into force of an aid measure, there is a situation of effective competition on the relevant market (judgment of 23 January 2019, Fallimento Traghetti del Mediterraneo, C‑387/17, EU:C:2019:51, paragraphs 39 and 40).
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