The Guidelines on a common definition of European money market funds adopted by the Committee of European Securities Regulators on 19 May 2010 to create a minimum level playing field for MMFs in the Union were, one year after their entry into force, applied by only 12 Member States, thus demonstrating the persistence of divergent national rules.
Na Treoirlínte maidir le sainmhíniú comhchoiteann ar chistí margaidh airgid Eorpacha a ghlac Coiste na Rialtóirí Urrús Eorpach an 19 Bealtaine 2010 maidir le CMAnna chun íosmhéid de chothroime iomaíochta a bhaint amach idir CMAnna san Aontas, ní raibh siad curtha i bhfeidhm ach ag 12 Bhallstát bliain i ndiaidh a dteacht i bhfeidhm, rud a léiríonn gurb ann fós do rialacha náisiúnta atá éagsúil le chéile.