By the way, the tax rate of Shiko-rokumin, having been set by the Hojo clan, continued being used for generations until the Kyoho Reforms (the reforms in the Kyoho era) were executed by Yoshimune TOKUGAWA later.
ちなみに四公六民という北条氏の定めた税率は、その後徳川吉宗の享保の改革で引き上げがなされるまで継承される事となる。