We find and compare two simple fiscal rules. The first is a theoretical rule that approximates well Ramsey-optimal fiscal policy in a DSGE model calibrated to the U.S. economy over the period 1955:1 to 2007:3. The second is an empirical rule that approximates well actual U.S. fiscal policy over...

For years the economics profession has been puzzled by one of the most perplexing economic problems - the overall slowdown in the growth rate of labour productivity since 1973. Not only was the deceleration a worldwide trend, the growth of productivity also turned out to be markedly slower in...