166The Court of Justice has held that an undertaking in a dominant position on a raw materials market could not abuse that dominant position on that market to facilitate its entry to a derivative products market incorporating those raw materials, affecting the competitive position of other operators on the latter market, for example by refusing to supply them with the raw materials necessary for their activities on the second market (Joined Cases 6/73 and 7/73 Istituto Chemioterapico Italiano and Commercial Solvents ν Commission [1974] ECR 223, ‘Commercial Solvents’, paragraph 25). Even if failure to grant similar rebates to other industrial sugar purchasers is not tantamount to a refusal to supply, the principle of the abusive exploitation of a dominant position on a market to affect competition on another market has already been established. In this case, it is further apparent that the undertaking in question held a dominant position on both markets concerned.