Tomiko engaged in moneymaking activities, such as collecting tolls by setting up seven barriers in Kyoto (Nanakuchi-no-Seki), investing in the rice market, and taking bribes from loan sharks, and it was her financial power that enabled the Muromachi shogunate to function.
富子は京都七つ口に関所を作って関銭を徴集（七口の関）し、米相場や高利貸しからの賄賂を受けるなど利殖活動を行い、彼女の財力によって室町幕府が運営されていた。