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A colleague of mine sent me the following query.  Can anyone help?   
 
"I was wondering when the concepts of demand and supply curves (in  
the partial equilibrium framework) appeared in economics. The clearest  
and the most beautiful classical exposition of the concepts, that I know  
of, is Marshall. However, I find it improbable that the concepts  
appeared as late as Marshall. I just checked Schumpeter and Blaug, but  
they do not seem to discuss this explicitly. I was wondering whether  
you might know the answer to my question or you might be able to  
indicate some source where I could look for the answer."    
 
Stephen Cullenberg 
University of California--Riverside 
 
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