More fundamentally, monetary unions – in a broader sense – have existed not only within single states, but also in groups of sovereign states, the gold standard being the most notable example in history. The experience of such monetary unions offers two lessons.
Plus largement, il a existé d’autres unions monétaires, non seulement entre Etats, mais entre groupes d’Etats souverains, et l’étalon or en a constitué l’un des grands exemples historiques.