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Barkley, yes Knight was indeed much earlier than Ellis and Fellner
and his was a comment on 2 papers by F.D. Graham in Feb and Nov
1923.
I do not think Kinght's treatment was necessarily "narrower" in
that it addressed perceptions of private and social costs. But he
did not use "externality" or "externalities"
Bator was the one, unless the Samuelson faction can produce a
citation for us.
dan
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