Standard New Keynesian models deliver puzzling results at the effective lower bound of short-term interest rates: greater price flexibility amplifies the fall in output in response to adverse demand shocks; labour tax cuts are contractionary; the multipliers of wasteful government spending are...

This paper revisits the paradox of flexibility, i.e., the result that, in a liquidity trap, greater price flexibility amplifies output volatility in response to negative demand shocks. We argue this paradox is the consequence of a failure of standard models to correctly characterize monetary...