In the Yuan Dynasty and Ming Dynasty, the credibility of copper coins had been degraded, and the influential families and the merchants engaging in large-scale trade who monopolized oversea trade could get these coins by selling inexpensive things and quite easily.
元や明ではすでに銅銭の信用が低下しており、貿易を独占するような権門や大商人たちはこれを安い元手できわめて容易に入手していた。