For the economy described in Problems 3 and 4, take as given that the multiplier for this economy is 2.5. Find the effect on short-run equilibrium output of (L04)
a. An increase in government purchases from 1,500 to 1,600.
b. A decrease in tax collections from 1,500 to 1,400 (leaving government purchases at their original value).
c. A decrease in planned investment spending from 900 to 800.