Suppose in a simple economy with no foreign sector, the MPC is equal to 0.9. How much of a lump sum tax (∆T) would have to be given up to raise output by 100 million?
11.1 million
The multiplier here is the tax multipler= −c1−c = -9. To increase output by 100 million, lump-sum taxes worth 1009 million = 11.1 million have to be given up.