In New Keynesian models favourable cost-push shocks lower inflation and increase output. Yet, when the central bank's inflation target is not perfectly observed these shocks turn contractionary as agents erroneously perceive a temporary reduction in the target. This effect is amplified when...

This paper assesses the macroeconomic consequences of a prolonged period of low and falling inflation when monetary policy is constrained by the zero lower bound (ZLB) on short-term nominal interest rates, the private sector is indebted in nominal terms (debt deflation mechanism) and nominal...