262Accordingly, in order to be able to carry out an effective judicial review of Commission decisions declaring a concentration incompatible with the internal market, it is for the EU Courts, after examining the substance of the complaints made against the Commission’s assessment of the relevant factors and in the light of the outcome of those complaints, to assess whether all the relevant factors and evidence on which the Commission has relied and which may be regarded as established, including those which have not been disputed, are sufficient to demonstrate the existence of a significant impediment to effective competition. That overall assessment does not mean that the EU Courts are required to examine of their own motion the substance of the assessment of factors or other evidence which have not been challenged by the parties to the proceedings.
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