153As regards, more specifically, a Commission decision which relies exclusively, with respect to certain addressees, on the presumption that they actually exercised decisive influence, the Commission is in any event required – if it is not to render that presumption in reality irrebuttable – to explain adequately to those addressees the reasons why the elements of fact and of law put forward did not suffice to rebut that presumption. The Commission’s duty to state reasons for its findings on that point flows primarily from the fact that that presumption is open to rebuttal, for the purposes of which it is necessary for those concerned to produce evidence relating to the economic, organisational and legal links between the companies concerned.