54As stressed in point 20 of the Communication from the European Commission entitled ‘Guidance on the Commission’s enforcement priorities in applying Article [102 TFEU] to abusive exclusionary conduct by dominant undertakings’ (OJ 2009 C 45, p. 7), although, where the conduct has been in place for a sufficient period of time, the market performance of the dominant undertaking and its competitors may provide evidence of the exclusionary effect of the practice in question, the opposite situation that a certain course of conduct has not produced actual anti-competitive effects cannot rule out the possibility that that conduct was in fact capable of doing so when it was implemented, even if a long period of time has passed since that conduct took place. Such absence of effect could stem from other causes and be due to, inter alia, changes that occurred on the relevant market since that conduct began or to the fact that the undertaking in a dominant position was unable to complete the strategy underpinning that conduct.
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