The Estimation of the New Keynesian Phillips Curve in Japan and Its Implication for the Inflation Response to a Monetary Policy Shock


The New Keynesian Phillips Curve (NKPC) is a key building block in many modern macroeconomic models. This study assesses the empirical fit of the NKPC in Japan by estimating a variety of its specifications. Some empirical results suggest that introducing nominal interest rates into the pure forward-looking NKPC, which implies the existence of a cost channel for monetary policy, helps improve their ability to explain Japanese inflation dynamics. In addition to the existence of the cost channel for monetary policy, these results show that the use of labor share (real unit labor costs) is an important factor in estimating the NKPC. As an implication of these findings, this study proposes that, in the context of the New Keynesian economics, both the existence of the cost channel for monetary policy and the sluggish adjustment of real unit labor costs can account for the fact that there is a long time lag between a monetary policy shock and its impact on inflation.

Keywords: New Keynesian Phillips Curve
       Cost Channel of Monetary Policy
       Inflation Responses to a Monetary Policy Shock

JEL Classification: C3; E3; E5

Research Institute for Economics and Business Administration
Kobe University
Rokkodai-cho, Nada-ku, Kobe
657-8501 Japan
Phone: (81) 78 803 7036
Fax: (81) 78 803 7059