29In so far as the appellants complain that the judgment under appeal did not find fault with the allegedly disproportionate nature of the starting amount of the fine because of the tripartite cooperation’s absence of impact on the market, suffice it to state that it is clear from settled case-law that it is the task of the General Court to examine whether the amount of a fine is appropriate and, as a general rule, it is not the task of the Court, when it rules on questions of law in an appeal, to substitute, on grounds of fairness, its own assessment for that of the General Court exercising its unlimited jurisdiction to rule on the amount of fines imposed on undertakings for infringements by them of European Union law (see the judgments in SGL Carbon v Commission, C‑328/05 P, EU:C:2007:277, paragraph 98, and Quinn Barlo and Others v Commission, C‑70/12 P, EU:C:2013:351, paragraph 57 and case-law cited).
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