We analyze the implications for monetary policy when deficient aggregate demand can cause a permanent loss in potential output, a phenomenon termed as output hysteresis. In the model, incomplete stabilization of a temporary shortfall in demand reduces the return to innovation, thus reducing TFP growth and generating a permanent loss in output. Using a purely quadratic approximation to welfare under endogenous growth, we derive normative implications for monetary policy. Away from the zero lower bound (ZLB), optimal commitment policy sets interest rates to eliminate output hysteresis. A strict inflation targeting rule implements the optimal policy. However, when the nominal interest rate is constrained at the ZLB, strict inflation targeting is sub-optimal and admits output hysteresis. A new policy rule that targets output hysteresis returns the output to the pre-shock trend and approximates the welfare gains under optimal commitment policy. A central bank unable to commit to future policy actions suffers from hysteresis bias: it does not offset past losses in potential output.

We analyze the implications for monetary policy when deficient aggregate demand can cause a permanent loss in potential output, a phenomenon we term output hysteresis. In the model, the incomplete stabilization of a temporary shortfall in demand reduces the return to innovation, thus reducing total factor productivity growth and generating a permanent loss in output. Using a purely quadratic approximation to welfare under endogenous growth, we derive normative implications for monetary policy. Away from the zero lower bound (ZLB), optimal commitment policy sets interest rates to eliminate output hysteresis. A strict inflation targeting rule implements the optimal policy. However, when the nominal interest rate is constrained at the ZLB, strict inflation targeting is suboptimal and admits output hysteresis. A new policy rule that targets output hysteresis returns output to its pre-shock trend and approximates the welfare gains under optimal commitment policy. A central bank that is unable to commit to future policy actions suffers from hysteresis bias, as the bank's inconsistent policy does not offset past losses in potential output.

We analyze the implications for monetary policy when deficient aggregate demand can cause a permanent loss in potential output, a phenomenon termed as output hysteresis. In the model, incomplete stabilization of a temporary shortfall in demand reduces the return to innovation, thus reducing TFP growth and generating a permanent loss in output. Using a purely quadratic approximation to welfare under endogenous growth, we derive normative implications for monetary policy. Away from the zero lower bound (ZLB), optimal commitment policy sets interest rates to eliminate output hysteresis. A strict inflation targeting rule implements the optimal policy. However, when the nominal interest rate is constrained at the ZLB, strict inflation targeting is sub-optimal and admits output hysteresis. A new policy rule that targets output hysteresis returns the output to the pre-shock trend and approximates the welfare gains under optimal commitment policy. A central bank unable to commit to future policy actions suffers from hysteresis bias: it does not offset past losses in potential output.

We study the mortgage cash flow channel of monetary policy transmission under fixed-rate mortgage (FRM) versus adjustable-rate mortgage (ARM) regimes by comparing the United States with primarily long-term FRMs and Spain with primarily ARMs that automatically reset annually. We find a robust transmission of mortgage rate changes to spending in both countries but surprisingly a larger effect in the United States-and provide two explanations for this finding. First, there are channels of transmission other than the mortgage cash flow effect since other interest rates co-move with the mortgage rate. Second, while mortgage resets in Spain are automatic and typically small, mortgagors in the United States must actively refinance to lock in lower rates. As a result, the mortgage cash flow effect in Spain is homogeneous across mortgagors and symmetric for rate increases and decreases, whereas in the United States the effect is largest when rates decline, especially for households identified as likely refinancers.

We analyze the impact of shifts in the industrial composition of the economy on the distribution of the frequency of price change and its consequences for the slope of the Phillips curve for the United States. By combining product-level microdata on the frequency of price change with data on industry shares from 1947 through 2019, we document that shifts in industrial composition led to a gradual reduction in the median monthly frequency of price change from 9.2 percent in 1947 to 6.9 percent in 2019. Other percentiles of the distribution of the frequency of price change show similar reductions. These declines were broadly driven by a shift in the industrial composition of the economy from primary and secondary industries toward service industries. In a calibrated multisector general equilibrium menu cost model, we find that this effect flattened the Phillips curve by 28.5 percent from 1947 to 2019. However, despite a flatter Phillips curve, persistent shocks to aggregate demand still can cause significant inflation.