4. The formula that should be used to solve the first part of this problem is ∆G × 1/(1−MPC).
The first part indicates that there was a decrease in government purchases, so ∆G will equal
−$10 billion. The formula that should be used to solve the second part is ∆NT×
5. A change in government purchases directly affects aggregate expenditure by the amount of
the change in purchases, and its multiplier equals 1/(1 − MPC). However, a change in net
taxes has no direct impact on aggregate expenditure. Rather, a change in net taxes affects
6. It would have the same impact on the spending multiplier as an increase in the MPC would,
7. A tax cut would increase disposable income. Individuals would in turn spend a portion of their
tax cuts, provided they felt that the tax cuts were long lasting. This would raise aggregate