37Next, it should be noted that the concept of an undertaking covers any entity engaged in an economic activity, regardless of its legal status and the way in which it is financed. The Court has stated that in this context the term ‘undertaking’ must be understood as designating an economic unit even if in law that economic unit consists of several natural or legal persons, and that when such an economic entity infringes the competition rules, it is for that entity, according to the principle of personal responsibility, to answer for that infringement (Case C-90/09 P General Química and Others v Commission [2011] ECR I-1, paragraphs 34 and 35 and the case-law cited, and Joined Cases C-201/09 P and C-216/09 P ArcelorMittal Luxembourg v Commission and Commission v ArcelorMittal Luxembourg and Others [2011] ECR I-2239, paragraph 95).
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