Following this post, I show the AD (blue) and AS (red) curves (with 5% shifts shown as dashed lines) quarterly from 2008 to 2012:
Again, I'm not sure if this is what the model is showing, but it appears that in 2008 Q3, the economy screamed out for looser monetary policy. The supply curve went horizontal and the demand curve became unresponsive to boosting AD. After the crisis hits, the economy appears to call for either fiscal or monetary stimulus, with monetary stimulus being better dollar for dollar. But I must emphasize that this is speculation at this point.