With respect to  AS/AD, surely it is unfair to demand a high level 
of  truth content in economic theories.

	Someone said that textbooks are full of the dry bones of 
past controversies.  This does not depreciate theory.  It suggests 
that it is a set of useful tools.

	Theories attempt to account for time bound problems, with  
a  view to finding an ameliorating policy.   Time bound problems 
change, of course, and the "dry bones" are put together differently 
to once  again find an ameliorating policy.

	Theories are pragmatically "true" when they are true, and  
they are not pragmatically true when they are not.

	This brings us back  to  Frank  Knight's assertions  about 
"truth in Economics", but Knight has spoken  for  himself.

Robin Neill