Demographics, Monetary Policy, and the Zero Lower Bound

We develop a New Keynesian life‐cycle model to assess the importance of population aging for monetary policy. The model successfully matches the age profiles of consumption‐savings decisions made by European households. It implies that demographic trends contribute significantly to the decline of the natural rate of interest (NRI) and potential output growth, and exacerbate the risk of hitting the zero lower bound (ZLB), given the current inflation targets. Under a realistic assumption that the central bank updates its estimates of the NRI only with some lag, aging may additionally lead to a sizable and persistent deflationary bias, elevating the ZLB risk even further.