As the timing of inflow and outflow of specie money did not always match although this business was done every year cyclically and continuously, when expense was needed before attaining the current money, it was unavoidable to borrow gold and silver from powerful merchants (especially kuramoto [sake brewer] or kakeya [merchants dealing in finance]), putting up their annual rice tax or local special products which were to be sold later as security, and they paid back when such rice tax or products were actually delivered.
こうした取引は循環的かつ継続的に毎年繰り返されるが、正貨獲得時期と正貨支出時期が一致するとは限らず、正貨獲得以前に支出を要する場合には、販売予定の年貢米や特産品を担保として有力商人（特に蔵屋敷に出入りする蔵元や掛屋）から金銀を借りて、実際に入ってきた年貢米や特産品をもって返済することになる。