Between 2011 and 2012 real GDP increased by $600 billion and imports increased by $80 billion.Based on these data,the marginal propensity to import equals

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The marginal propensity to import is the change in imports divided by the change in real GDP. In this case, the change in imports is $80 billion and the change in real GDP is $600 billion, so the marginal propensity to import is $80 billion / $600 billion = 0.13.

Between 2011 and 2012 Real GDP Increased by $600 Billion