The only successful instance of such an arrangement is the Bretton Woods conference in 1944, but even then the exchange rates that were fixed there proved unrealistic, and a major wave of parity alterations was soon needed (as well as the maintenance of exchange controls).
La única instancia exitosa de un acuerdo de este tipo es la conferencia de Bretton Woods en 1944, pero aún entonces los tipos de cambio que se fijaron allí resultaron ser poco realistas, y pronto hizo falta una ola importante de alteraciones paritarias (así como mantener controles de divisas).