If the marginal propensity to consume is .9 (or 9/10), under which circumstance could a \$15 increase in government spending lead to a \$150 increase in real GDP? Assume a closed economy with no taxes.
An upward sloping aggregate supply curve with a constant nominal wage.
An increase in the rate of interest that crowds out some private investment.
A horizontal aggregate supply curve (fixed price case) with no change in the rate of interest.
An economy which has no cyclical unemployment, only frictional unemployment.