Furthermore, as the monetary economy had developed in and after the Kamakura period, the kaeki-ken right (the right to levy duty, which was alternatively considered as the trade rights in Kyoto) was exercised against the 'za' (trade guilds) which had been descended from kugonin (purveyors to the imperial household) as well as merchants and traders (who had to provide guji on his behalf with the produce and products by means of production and acquisition), and an income which was resulted from the set-up of sekisho (barriers) and ritsubunsho (tax storehouses) supported both public and private economy.
更に鎌倉時代以後の貨幣経済の発達に乗って官司の供御人の系譜を引く座や商工業者（官司の代わりに生産物を生産・調達して官司に納める義務を有するとされていた）に対する課役権を行使（京都における営業権の意味合いもある）や関所・率分所の設置による収入なども公私の経済の資を支えた。