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To Professor Barkley Rosser: 
 
If you are interested in the actual usage of the term 'externality', 
Ronald Coase has a footnote on it in his _The Firm, The Market and The 
Law_ (Chicago: University of Chicago Press, 1988):  
 
"The earliest uses of the term 'externality' that I have come across are 
contained in Samuelson's review of de Graaf's _Theoretical Welfare 
Economics_in the_Economic Journal_(September 1958): 539-41, and in his 
article 'Aspects of Public Expenditure Theories,' _The Review of 
Economics and Statistics_(November 1958): 332-38. This article was a 
slight revision of paper delivered in December,1955" (23 n35). 
 
I hope this would be of help. 
 
Masazumi Wakatabe 
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