In particular, the beginning of the Sengoku Period was a stage in which money economy was established, through trade between Japan and Ming such as the tally trade (between Japan and the Ming dynasty) and private trade, which was a kind of smuggling, by introducing from the Ming, not only import articles but also a large quantity of copper coins.
特に、戦国時代初期にあっては、勘合貿易および一種の密貿易である私貿易といった日明間の貿易によって、明から舶来品だけでなく大量の銅銭の導入を図り、貨幣経済の確立をなしとげる段階にあった。