In 1609, bakufu decided the market price of three currency as 1ryo=silver 50 monme = Eiraku-tsuho (bronze coins struck in the Ming dynasty) 1 kanmon=Bitasen (low quality coins whose surfaces were worn away) 4 kanmon, however, it was introduced just as criterion and in reality, it was flexible rate which was left to market, and was intervened by the government in the case that the rate went too far.
また慶長14年（1609年）に幕府は三貨の御定相場として金一両＝銀五十匁＝永楽通宝一貫文＝鐚銭四貫文と定めたが、これは目安とされ実態は変動相場制で市場に委ね、相場が行き過ぎた場合は幕府が介入するというものであった。