This is an interesting business custom when talking about the monetary economy system in the Edo period, together with the Eisen-kanjo (a calculational procedure using Eiraku-tsuho [bronze coins struck in the Ming dynasty] as a fictional unit) in Bitchu Province and senme-satsu in the northern part of Kyushu and in the western part of Shikoku.
備中国の永銭勘定や九州北部・四国西部の銭匁札などと並んで、江戸時代の貨幣経済システムを語る場合に興味深い商習慣である。