Figure11-8The Aggregate Consumption Function and Planned Aggregate Expenditure The slope, or steepness of the line depends on the value of MPC. The greater MPC is, the steeper the line will be. AE0 is the intercept on the vertical axis. The lower line, CF, is the aggregate consumption function constructed from the data in Table 11-3. The upper line, AEPlanned, is the planned aggregate expenditure line, also constructed from the data in Table 11-3. It is equivalent to the aggregate consumption function shifted up by $500 billion, the amount of planned investment spending, IPlanned.