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Although it is not a direct answer to the question, a slightly different well-known
expression can be found in the General Theory:
 
"Practical men, who believe themselves to be quite exempt from  
any intellectual influences, are usually the slaves of some  
defunct economist." 
 
The Collected Writings of J. M. Keynes, VII, The General Theory, p. 383. 
 
Yukihiro Ikeda 
 
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