 The family suffered after the imposition of maritime restrictions by the shogunate in the 1630s, which put an end to the Annam trade, but continued to earn significant profits as core members of the "itowappu" system by which they enjoyed oligopolistic privileges in the silk trade.The family suffered heavy losses in 1655, as did the other "itowappu" merchants; the system was abolished the same year, but was later re-established in 1685.The family's fortunes continued to wane as, by 1700, it lost its special relationship with the shogunate, which could now obtain cheaper textiles from Edo-based merchants.