A lower neutral rate raises the likelihood that the requisite monetary accommodation when using conventional tools alone implies setting the nominal policy rate below zero. With constraints on moving nominal interest rates significantly below zero, central banks have looked to unconventional policy, such as asset purchases.
In the meantime, economic policy has acquired a macro-prudential scope, aiming at leaning against the wind, which includes several tools as the countercyclical setting of traditional 1/2  BIS central bankers' speeches  measures of capital requirements and borrower based instruments.