The merchants who imported raw silk threads in this system were called itowappa nakama (guild of raw silk thread importers) and it was the Edo Shogunate that gave this specific group of Japanese merchants called itowappu nakama the right to monopolize for buying raw silk threads from foreign merchants and the right to monopolize for selling the imported raw silk threads by wholesale to the domestic merchants.
江戸幕府が特定の商人集団（糸割符仲間）に独占的輸入権と国内商人への独占的卸売権を与えていた。