In addition, as distribution economy had not developed, selling and buying using currency such as silver did not exist and procurement of food had to be conducted by barter exchange with Korean people who had been living by self-sufficient economy.
また、流通経済が発達しなかったため銀などの貨幣による売買が成立せず自給自足が基本の朝鮮民とは物々交換などで食料の調達を行わなければならなかった。