Assume that the MPC is .8 in an economy that has an aggregate supply curve with a slope of 1. Also, suppose that the price level is flexible downward. A decrease in investment spending of $10 billion will shift the aggregate demand curve leftward by: (Show Steps)
A. $50 billion and decrease real GDP by $50 billion.
B. $50 billion and decrease real GDP by $25 billion.100%
C. $10 billion and decrease real GDP by $10
billion.
D. $10 billion and decrease real GDP by $25 billion.
A) Right answer B) It won't be true since the fall in Gdp is not 25 $ c ) False , because it didn't take multiplier effect into consideration .d) False , due to the same reason as c Explanation According to Keynesian economics , a change in investment will lead to multiplier effects in the society . The value of multiplier is defined by k = 1/ 1- mpc or 1/ mps. Here the value of mpc is given as .8 so multiplier =1/1-.8 = 1/.2 = 5 // This implies that a 10$ reduction in aggregate investment in the economy will lead to a 5times ( 10×5) 50$ fall in aggregate demand. ii ) multiplier = change in real GDP / change in injections , ie 5 = change in real GDP/ 10 $ ,. so change in real GDP = 10$ ×5 = 50$
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