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By how much will GDP change if firms increase their investment by $12 billion and the MPC is 0

Economics Dec 18, 2020

By how much will GDP change if firms increase their investment by $12 billion and the MPC is 0.8?

a.The change in GDP = $_ billion.

b. If the MPC is 0.5? The change in GDP = $ billion

Expert Solution

a.

Step 1: calculate the GDP multiplier

GDP multiplier = 1 / (1 - MPC)

Where:

MPC = Marginal Propensity to Consume = 0.8

Hence:

GDP multiplier = 1 / (1 - 0.8) = 5

Step 2: multiply the GDP multiplier by a change in investment to obtain the change in GDP.

5 * 12 = $60 billion

b.

Step 1: calculate the GDP multiplier

GDP multiplier = 1 / (1 - MPC)

Where:

MPC = Marginal Propensity to Consume = 0.5

Hence:

GDP multiplier = 1 / (1 - 0.5) = 2

Step 2: multiply the GDP multiplier by a change in investment to obtain the change in GDP.

2 * 12 = $24 billion

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