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Suppose that in the following figure, investment spending increases by $10 million, shifting up the aggregate expenditure line and GDP increases from GDP1 to GDP2. If the MPC is 0.9, then what is the change in GDP? a. $10 million b. $100 million c. $90 million d. $9 million

Question

Suppose that in the following figure, investment spending increases by $10 million, shifting up the aggregate expenditure line and GDP increases from GDP1 to GDP2. If the MPC is 0.9, then what is the change in GDP?

a. $10 million

b. $100 million

c. $90 million

d. $9 million

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Solution

The multiplier effect in economics refers to the proportional amount of increase, or decrease, in final income that results from an injection, or withdrawal, of spending. The formula for the multiplier is 1/(1-MPC).

In this case, the MPC (marginal propensity to consume) is 0.9. So, the multiplier is 1/(1-0.9) = 10.

If investment spending increases by 10million,andthemultiplieris10,thenthechangeinGDPwouldbe10 million, and the multiplier is 10, then the change in GDP would be 10 million * 10 = $100 million.

So, the correct answer is:

b. $100 million

This problem has been solved

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