35In that regard, it is clear from the same case-law that it is not necessary that the financial balance or economic viability of the undertaking entrusted with the operation of a service of general economic interest should be threatened. It is sufficient that, in the absence of the rights at issue, it would not be possible for the undertaking to perform the particular tasks entrusted to it, or that maintenance of those rights is necessary to enable the holder of them to perform tasks of general economic interest which have been assigned to it under economically acceptable conditions (Case C-340/99 TNT Traco [2001] ECR I-4109, paragraph 54).
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