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Dan Bromley wrote: 
 
> Howard Ellis and William Fellner (AER, 33:493-511, Sept. 1943) published 
> an article "External Economies and Diseconomies" in which they comment 
> on the Marshall-Pigou proposal for taxes on industries of "diminishing 
> returns" and bounties on industries of "increasing returns."   . . .  
> Ellis and Fellner use the term "an external economy" and an "internal 
> economy." 
 
Dan, 
 
Thanks much.  A real line there.  But did Knight beat Ellis and Fellner 
to the punch?  And was Knight's conception much narrower? 
 
Barkley Rosser 
 
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