StageThree began on 1 January 1999 with the irrevocable fixing of exchange rates, the transfer of monetary policy competence to the ECB and the introduction of the euro as the single currency.
Thosaigh Céim aTrí ar 1 Eanáir 1999 le socrú rátaí malairte go neamh-inchúlghairthe, le haistriú na hinniúlachta maidir le beartas airgeadaíochta chuig an BCE agus le tabhairt isteach an euro mar airgeadra aonair.