137In that regard, the Court has already held that an undertaking which is in a dominant position on a market and ties purchasers — even if it does so at their request — by an obligation or promise on their part to obtain all or most of their requirements exclusively from that undertaking abuses its dominant position within the meaning of Article 102 TFEU, whether the obligation is stipulated without further qualification or whether it is undertaken in consideration of the grant of a rebate. The same applies if the undertaking in question, without tying the purchasers by a formal obligation, applies, either under the terms of agreements concluded with these purchasers or unilaterally, a system of loyalty rebates, that is to say, discounts conditional on the customer’s obtaining all or most of its requirements — whether the quantity of its purchases be large or small — from the undertaking in a dominant position (see judgment of 13 February 1979, Hoffmann-La Roche v Commission, 85/76, EU:C:1979:36, paragraph 89).
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