125First, calling in question the Commission’s assessment that subsidies for the purchase of digital decoders were not necessary to correct the problem of coordination between the operators on the market, as that problem had already been dealt with through the setting of a mandatory date for digitisation, Mediaset alleges infringement of Article 87(3)(c) EC. In order to be compatible with the common market for the purposes of Article 87(3)(c) EC, aid must pursue an objective in the common interest and must be necessary and proportionate for that purpose. The common interest objective purportedly pursued by the measure at issue is to address a market failure relating, in particular, to the problem of coordination between operators, which is the cause of a barrier to the development of digital broadcasting. Without there being any need to examine whether, as Mediaset claims, the Commission adopted a different position in the contested decision from that applied in previous decisions on digital terrestrial TV, the Court considers that, in the present case, the mandatory nature of the date laid down for digitisation is such as to resolve the problem of coordination among operators and, accordingly, the subsidy for the purchase of digital decoders was unnecessary.