According to the graph below, if investment spending decreases in this economy, then the:
a. aggregate spending line will shift down, decreasing the income-expenditure equllibrium GDP.
b. aggregate spending line will shift up, increasing the income-expenditure equilibrium GDP.
c. economy will move upward along the aggregate spending line, increasing the income-expenditure equilibrium GDP.
d. economy will move downward along the aggregate spending line, decreasing the income-expenditure equilibrium GDP.