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This article explores whether cartelists should be liable for losses resulting from umbrella pricing, thereby critically evaluating the ECJ's judgment in Kone. Since the EU legislature did not resolve the question of liability for umbrella pricing, it has to be evaluated in accordance with national law, which must however comply with the principles of equivalence and effectiveness pursuant to Article 4(3) TEU. Therefore and in accordance with the court's judgment in Courage, the decisive criterion should be the effect a cartelist's liability for umbrella pricing would have on effective and efficient enforcement of competition law. An analysis based on the standard model of optimal sanctioning reveals the ambivalent effect of such a liability. Thus, in view of opposing risks of systematic over- and under-deterrence and in accordance with the principle of institutional balance, the court has to leave the EU legislature and the national legislatures, respectively, with the discretion not to provide for compensation in the case of umbrella effects. [ABSTRACT FROM AUTHOR]