Answer:
4) changes in marginal tax rates exert important effects on real output and employment
Step-by-step explanation:
Supply side economics is very similar to Keynesian economics, both focusing on increasing aggregate demand to boost the economy. The main difference is that Keynesian economics stresses the importance of increasing government spending, while supply side economics favors cutting taxes.
Both approaches generally result in the same, an increase in aggregate demand, decrease in unemployment, increase in aggregate supply, and on the negative side, the government's deficit increases as well as the inflation rate.