192The validity of such an approach is reinforced by the fact that it also conforms to the general principle of legal certainty, since taking into account the costs and prices of the dominant undertaking enables that undertaking, in the light of its special responsibility under Article 82 EC, to assess the lawfulness of its own conduct. While a dominant undertaking knows its own costs and prices, it does not as a general rule know those of its competitors (Deutsche Telekom v Commission paragraph 170 above, paragraph 202, and TeliaSonera, paragraph 146 above, paragraph 44). Furthermore, an exclusionary abuse also affects potential competitors of the dominant undertaking, which might be deterred from entering the market by the prospect of a lack of profitability.
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