1.4. Chart the aggregate expenditures (AE) model in Excel using the data from Table 1: A Private Closed Economy. Watch the tutorial: How to Create a Basic Chart in Excel. Remember, the 45degree line (also known as the Keynesian Cross) is a tool that shows how differences in aggregate expenditures and real GDP can affect business inventories which will affect future levels of real GDP. Aggregate expenditure and GDP are both function of consumption, investment, government spending, and net exports. So, the equations for the two are identical: Y=C+I+ G + NX, and AE (aggregate expenditure) = C + I + G + NX For private closed economy the equation is: Y = C + I, and AE (aggregate expenditure) = C +