I believe that introducing a negative interest rate would be meaningful only when the monetary base target and the asset purchase target are gradually reduced, namely, when tapering is implemented, so I cited this as the reason for my vote against the introduction of a negative interest rate at the January MPM.
I believe that it is desirable to maintain the system in which balances in current accounts at the Bank are divided into three-tiers -- which was adopted at the time of the introduction of a negative interest rate -- from a somewhat longerterm perspective with an eye to a future exit from QQE.