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Surely, the origin of supply and demand curves has to be  
somewhere in medieval heraldry -- some kind of graphic  
representation of crossed swords that would be the counterpart to  
the knight's extension of the right hand in peace as the ritual  
source of the commercial handshake. To admit as much, though,  
might call too much attention to the unresovable ambiguity of price.  
If price was unambiguous, all the supplementary paraphenalia like  
handshakes, contracts and receipts would be superfluous. Inherent  
in any market exchange -- IN ADDITION TO supply and demand --  
is the potential for misrepresentation, deception, fraud, treachery.  
Thus the "supplement" is indispensable, and as a consequence  
the intersection of the supply and demand curves CANNOT  
represent price because the curves themselves don't include that  
supplement.   
 
Tom Walker 
TimeWork Web 
 
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