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si la valeur d'une devise baisse dans un pays (A) et pas dans un autre (B), les opérateurs ont intérêt à faire la chose suivante : obtenir de l'or en faisant jouer la convertibilité dans le pays A et obtenir de l'or, transporter l'or dans le pays B et l'échanger contre la devise du pays, enfin revenir dans le pays A et échanger la devise du pays B contre la devise du pays A. La conséquence de quoi la demande en devise est stable dans tous les pays du système. A l'époque de l'étalon or, il existait donc (théoriquement) des mécanismes d'arbitrage qui assuraient que les monnaies restaient plus ou moins fixes

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