We propose a framework of optimal monetary policy where debt sustainability may, or may not, be a relevant constraint for the central bank. We show analytically that in each environment the optimal interest rate path consists of a Taylor rule augmented with forward guidance terms. These terms...

We build a tractable New Keynesian model to study four types of monetary and fiscal policy. We find that quantitative easing (QE), lump-sum fiscal transfers, and government spending have the same effects on the aggregate economy when fiscal policy is fully tax financed. Compared with these three...

This paper studies the impact government expenditure has on inflation by examining an augmented Phillips curve implied from a structural New Keynesian model, Our estimation results, based on external instruments, show that the augmented Phillips curve has a flatter slope than the canonical...