During the Edo period in Japan, gold, silver and copper were popular together. In the case of high payment, Edo will use gold, while Osaka is more accustomed to using silver, which has promoted the prosperity and development of commerce in the two places to some extent. When the shogunate is appointed, the currency ratio is usually: gold 1 two = 50 Li of silver = 4000 Wen of money. Because most of Kanto where Edo is located uses gold, kanto region also stipulates: gold 1 two =4 cents = 16 Zhu; Accustomed to using silver, Kansai, with Osaka as the center, also has the corresponding exchange rate of silver 1 = 10; As for copper coins, everything is unified as: money 1 penetration = 1000. But in real life, this ratio is unstable, fluctuating almost every day in some special periods, and most of them are depreciating.