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Paul McNulty in _The origins and Development of Labor Economics_   (MIT 
1980) calls Smith's discussion of wage differentials  "one of the best 
analysis of that topic ever undertaken" but he does not cite any other 
treatment of the topic.  McNulty might be the best person to contact. 
 
 
PAUL A. HEISE, Ph.D.    "The ideas of economists and political   
Associate Professor             philosophers both when they are right 
  of Economics          and when they are wrong, are more powerful 
Political Science and   than is commonly understood. Indeed the  
  Economics Dept                world is ruled by little else. Practical men, 
Lebanon Valley College  who believe themselves to be quite exempt  
Annville, PA 17003              from any intellectual influences, are 
usually  
(717) 867-5644          the slave of some defunct economist."            
[log in to unmask]                   John Maynard Keynes 
 
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