In: Economics
This means the Marginal propensity to Save (MPS) = 0.25
So, spending multiplier = 1/MPS = 1/0.25 = 4
This means, the government needs to spend $1, to close a GDP gap of $4.
So, to close the GDP gap of $400, the government needs to spends = $400/4 = $100
So, the government needs to spend $100.