314In any event, it must be noted that, as a result, inter alia, of transactions bringing about transfers or concentrations, an undertaking’s overall resources may vary, decreasing or increasing significantly within a relatively short space of time, in particular between the end of the infringement and the adoption of the decision imposing the fine. It follows that those resources must be valued, so as properly to achieve the objective of deterrence, in accordance with the principle of proportionality, at the time when the fine is imposed (Case T-279/02Degussa v Commission [2006] ECR II-897, paragraph 285).