(137)It is necessary to enhance convergence of powers at the disposal of competent authorities so as to pave the way towards an equivalent intensity of enforcement across the integrated financial market. A common minimum set of powers coupled with adequate resources should guarantee supervisory effectiveness. This Directive should therefore provide for a minimum set of supervisory and investigative powers competent authorities of Member States should be entrusted with in accordance with national law. Those powers should be exercised, where the national law so requires, by application to the competent judicial authorities. When exercising their powers under this Directive, competent authorities should act objectively and impartially and remain autonomous in their decision making.