Recital 37

(37)A common minimum set of effective tools and powers for the competent authority of each Member State will guarantee supervisory effectiveness. Market undertakings and all economic actors should also contribute at their level to market integrity. In this sense, the designation of a single competent authority for market abuse does not exclude collaboration links or delegation under the responsibility of the competent authority, between that authority and market undertakings with a view to guaranteeing efficient supervision of compliance with the provisions adopted pursuant to this Directive.