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Officiellement, on reconnaît au moins trois fonctions à la monnaie : la mesure de la valeur, permet des transactions (l'intermédiaire des échanges) et la fonction de réserve de valeur (cette devise est stockable). L'étalon-or est le système monétaire international qui a régi les transactions monétaires pendant la quasi-totalité du 19ème siècle. Dans les faits, l'année 1870 marquera l'entrée véritable dans ce nouveau système.

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