37It should be borne in mind that since such a concession is of certain cross-border interest, its award, in the absence of any transparency, to an undertaking located in the Member State to which the contracting authority belongs, amounts to a difference in treatment to the detriment of undertakings which might be interested in that concession but which are located in other Member States. In excluding those undertakings, that difference in treatment works primarily to their detriment and therefore amounts to indirect discrimination on grounds of nationality, which is, in principle, prohibited by Articles 49 TFEU and 56 TFEU (see, to that effect, ASM Brescia, paragraphs 59 and 60 and the case-law cited).
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