237It follows from this that, in the case of a two-sided system such as the MasterCard scheme, in order to assess whether a measure which in principle infringes the prohibition laid down in Article 81(1) EC — in so far as it creates restrictive effects in regard to one of the two groups of consumers associated with that system — can fulfil the first condition laid down in Article 81(3) EC, it is necessary to take into account the system of which that measure forms part, including, where appropriate, all the objective advantages flowing from that measure not only on the market in respect of which the restriction has been established, but also on the market which includes the other group of consumers associated with that system, in particular where, as in this instance, it is undisputed that there is interaction between the two sides of the system in question. To that end, it is necessary to assess, where appropriate, whether such advantages are of such a character as to compensate for the disadvantages which that measure entails for competition.
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