In Figure 3-7 above, when autonomous planned spending is $250, the equilibrium income level is

The U.S. aggregate demand curve shifts leftward if

A) the economic conditions in Europe improve so that European incomes increase. B) there is a tax cut. C) the Federal Reserve increases the interest rate. D) the exchange rate falls.

The Laffer curve shows as tax rates rise, tax revenue:

a. rises. b. first rises, then falls, and then rises again. c. falls. d. first rises, and then falls. e. remains at a constant level.