284The proportionality of a penalty must in particular be assessed in the light of the deterrent effect sought by its imposition and it is necessary to use that total amount, for the purposes of that assessment, in order to take into account the economic power of the undertaking concerned (see, to that effect, judgment of 20 January 2016, Toshiba Corporation v Commission, C‑373/14 P, EU:C:2016:26, paragraphs 83 and 84).