The chart above is from Scott Grannis, who explains:
"This chart (inspired by Brian Wesbury) again bears repeating, since it lends support to claims by the anti-Keynesians (of which I am one) that the biggest factor that has worked to slow economic growth in recent years is the huge increase in federal spending. Instead of "stimulating" the economy, enormous increases—in both nominal and relative terms—in federal spending have ended up "stimulating" the unemployment rate more than anything else.
The reason? The public sector spends money much less efficiently than the private sector. And when you consider that over 70% of federal spending takes the form of "payments to individuals" (i.e., transfer payments), and that this has been the most rapidly growing portion of total spending, and you understand Milton Friedman's assertion that you don't spend other people's money on yourself nearly as carefully and efficiently as you spend your own money on yourself, then it becomes easier to understand. The vast bulk of government spending these days boils down to transferring money from those who are working and producing the most, to those that are working and producing the least, and that is not a prescription for a strongly growing economy."