In this paper I accept that just as mainstream economics can be charac
terized by its insistence upon a deductivist method, so the least cont
entious, most widely accepted aspects of Post-Keynesianism can be acco
unted for by its anti-deductivist stance and more specifically by its
tacit commitment to something like critical realism. I argue that neo-
Ricardian economics, to the extent that it takes closure for granted a
s a natural and useful starting point for analysis, retains an underly
ing commitment to deductivism and so is difficult to reconcile with Po
st-Keynesianism. By providing a criterion for assessing whether neo-Ri
cardianism belongs within a coherent Post-Keynesianism I also clarify
why the nature of this relationship has for so long remained unresolve
d. Not until it was recognized that coherence within Post-Keynesianism
turns upon methodological issues, and essentially involves the abando
nment of the deductivist framework, could progress in understanding it
s relationship with neo-Ricardianism be made.