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Mill (Principals Book III, chapter II) seems to talk on the general idea, 
relating U = utility and D = demand, (with their relative weighting guided 
by 
issues of supply and information) in their impact on what a purchaser is 
willing to pay.  He credits de Quincey "Logic of Political Economy." 
 
Smith also discusses the idea at least indirectly, in commenting on 
situations 
where the "natural price" does and does not hold. 
 
I'm sure others can discuss these in greater depth, but this should serve 
as a starting point. 
 
On the more general thought; is there, and if not, shouldn't there be, an 
internet site with the history of various terminology? 
 
Mike Robison 
 
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