(11)Comparability of financial information throughout the Community makes it necessary to require Member States to introduce a system of fair value accounting for certain financial instruments. Member States should permit the adoption of that system by all companies or any classes of companies subject to the Directives 78/660/EEC, 83/349/EEC and 86/635/EEC in respect of both the annual and consolidated accounts or in respect of consolidated accounts only. Further, Member States should be permitted to require the adoption of that system in respect of all companies or any classes of companies for both the annual and consolidated accounts or for the consolidated accounts only.