Aggregate demand

In the Macroeconomics section of the course the main model we are interested in is the Aggregate Demand (AD) and Aggregate Supply (AS) model.  It is important that we understand not just what AD is and how to draw the curve, but what causes it to shift.  As with Microeconomics we need to distinguish between movements along the curve and shifts in the curve in order to analyse the impact of different changes and situations.