However, since it was predictable what would happen to the clan that caused such an attack, Oishi ordered the commissioner of finance Tsuneki OKAJIMA to deal with the money used in Ako Domain and established a few currency exchange offices on April 27, which allowed conversion of the money at the rate of 60%, in order to avoid economic confusion.
しかし殿中刃傷を起こした家がどうなるかは予想がついたので、大石は藩札の処理を札座奉行岡島常樹に命じ、早くも翌3月20日(旧暦)（4月27日）には領内数箇所に藩札交換所を設けて六分率で交換させ、赤穂経済の混乱の回避に努めた。