9) The line AE = Y represents the equilibrium condition when aggregate expenditure equals real GDP. Hence, it is a 45-degree line. The line AE = C+I+G+NX represents the aggregate expenditure. What is the equilibrium real GDP when AE=C+I+G+NX? Note: This is an easy question. There is no trick here. However, please make sure you watch the lecture videos and truly understand the concept (the differences between these two lines, why AE=Y is an equilibrium condition, why AE=C looks like that, and why there is a parallel shift when AE=C+I, AE=C+I+G and AE=C+I+G+NX)