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Thanks to Robert Brown and to Mat Forsater for their responses.  
Norman Malcolm is pretty definitive. I also had forgotten the "tree  
without its branches" quote from the preface to the Investigations. I  
guess my skepticism stems from a certain discomfort I have with a  
kind of apotheosis of Sraffa that I encounter too often among my neo- 
Ricardian friends. This anecdote really feeds that, by making Sraffa in  
part responsible for one of the most important philosophical  
developments of the century. But I stand--or sit, at any rate--corrected!  
  
Since we're talking about Wittgenstein, I'll share an aphorism from  
*Culture and Value* that seems to me to have some resonance for  
those familiar with the state of mainstream economic theory:   
 
"There is no religious denomination in which the misuse of  
metaphysical expressions has been responsible for so much sin as it  
has in mathematics."   
 
Kevin Quinn 
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