| Abstract: | We study the incidence and severity of periods with a binding effective lower bound on nominal interest rates and the efficacy of three types of state-dependent policies—forward guidance about the path of future interest rates, large-scale asset purchases, and spending-based fiscal stimulus—in mitigating the detrimental consequences of the lower bound for macro-economic stability. Based on the ECB's New Area-Wide Model of the euro area, our findings suggest that, if left unaddressed, the lower bound can cause substantial macro-economic distortions. In the near term, forward guidance, if fully credible, is most powerful and can largely undo these distortions. A combination of imperfectly credible forward guidance, asset purchases, and fiscal stimulus is almost equally effective, especially when asset purchases enhance the credibility of the forward-guidance policy via a signaling effect. In the long run, with an equilibrium real rate as low as zero, a combination of all three policies is needed to materially reduce the distortions. |
