We investigate whether US government spending multipliers are higher during periods of heightened uncertainty or economic slack as opposed to normal times. Using quarterly historical data and local projections, we estimate a cumulative one-year multiplier of 2 during uncertain periods. In...

We investigate whether the macroeconomic effects of government spending shocks vary with the level of uncertainty. Using postwar US data and a Self-Exciting Interacted VAR (SEIVAR) model, we find that fiscal spending has positive output effects in tranquil times but is contractionary during...