michael,
OK, I grant that on pp. 300-303 of the GT, Keynes
does not describe an AD curve in P-Q space, although
he clearly describes an AS, curve, without calling it that.
So, perhaps a downward-sloping AD curve in P-Q
space is "non-Keynesian" in that sense. But, why is it
"anti-Keynesian"? After all, a downward-sloping AD
curve allows for cost-push inflation theories, although
one can get that with a vertical or upward-sloping AD
if one has it shift backwards due to falling income with
a backward-shifting AS curve.
Barkley Rosser
