The following graph may look a bit odd, since it has no curve on it.  But it shows something cool.  If I did this correctly, the gray bars show periods when:
1.  real private sector spending hit a new high and the government ran a surplus
2.  real private sector spending fell below a previous high and the government ran a deficit
Keynesian governments will generally behave in that way. 
The turquoise bars show non-Keynesian behavior:
1.  real private sector spending hit a new high and the government ran a deficit
2.  real private sector spending fell below a previous high and the government ran a surplus


πολύ ωραίο γράφημα - great job you did Mike with this graph!
http://www.angrybearblog.com/2011/02/critique-of-tyler-cowen-great.html