50Since a national competition authority such as the Authority is responsible for ensuring, inter alia, that Article 81 EC is observed and that provision, in conjunction with Article 10 EC, imposes a duty on Member States to refrain from introducing measures contrary to the Community competition rules, those rules would be rendered less effective if, in the course of an investigation under Article 81 EC into the conduct of undertakings, the authority were not able to declare a national measure contrary to the combined provisions of Articles 10 EC and 81 EC and if, consequently, it failed to disapply it.
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