The celebrated Taylor rule provides a simple formula that aims to capture how the central bank interest rate is adjusted as a linear function of inflation and output gap. However, the rule does not take explicitly into account the zero lower bound on the interest rate. Prior studies on interest...

Deviations of policy interest rates from the levels implied by the Taylor rule have been persistent after the turn of the century even before the financial crisis. These deviations could be due to lower real interest rates, as stated by the savings glut hypothesis as well as the apparent success...