The presence of ginza in various parts of the country until the Edo Period was caused by the shortage of Keicho chogin coins in areas outside Edo, due silver being exported out of the country.
このような各地銀座が江戸時代まで続いた理由は、銀の海外流出などにより慶長丁銀が地方まで充分に行き渡らなかったことに起因する。