The figure below depicts an aggregate expenditure function (AE). The straight line is a 45-degree line. AE is the initial level of aggregate expenditure, and then it changes to AE, Use it to answer the following questions. 1 mark each 1260 1240- 1220- Aggregate planned exp. (bn. of 2007 dolars) 1200- 1180- 1160 1160- 1140 1140 AE AEO 1160 1180 1200 1220 Real GDP (billions of 2007 dollars) 40 1. How much is initial equilibrium expenditure when using the AE curve? 2. What is the change in aggregate expenditure when the AE curve shifts up from AE to AE? 3. By how much does equilibrium aggregate expenditure change when the AE curve shifts from AEo to AE?