Macmillan Learning rise (Figure: Aggregate Expenditures and Real GDP) Use Figure: Aggregate Expenditures and Real GDP. If the level of real GDP equals $9,000 billion, and there are no changes in the consumption function or in planned investment, then real GDP in the next period. will Aggregate expenditures per year (billions of dollars) $15,000 13,500 45-degree line 12,000 AE 10,500 9,000 7,500 6,000 4,500 3,000 1,500 0 $3,000 6,000 9,000 12,000 15,000 Real GDP (Y) per year (billions of dollars) fall fall, but only if there is an offsetting change in autonomous consumption remain unchanged