129As regards the product market, which is the only point at issue in this question, it is clear from settled case-law that the concept of the relevant market implies that there can be effective competition between the products or services which form part of it, and this presupposes that there is a sufficient degree of interchangeability between all the products or services forming part of the same market in so far as a specific use of such products or services is concerned. That interchangeability or substitutability is not assessed solely in relation to the objective characteristics of the products and services at issue. There must also be taken into consideration the conditions of competition and the structure of supply and demand on the market (judgment of 23 January 2018, F. Hoffmann-La Roche and Others, C‑179/16, EU:C:2018:25, paragraph 51 and the case-law cited).
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