At that time in Japan, rice and cloth were the popular items to exchange as material money, because then-current society of Japan had not reached yet to the economic level to necessiate money currencies, and therefore circulation of money was limited to the Kinai area (countries near Kyoto.)
当時の日本は米や布などの物品貨幣が一般的であり、社会経済水準が貨幣を必ずしも要していなかったため、畿内とその周辺国以外にはあまり普及しなかったとも考えられる。