Econometrica: Jul 1939, Volume 7, Issue 3
Fellows of the Econometric Society
https://doi.org/0012-9682(193907)7:3<286:FOTES>2.0.CO;2-6
p.
286-287
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https://doi.org/0012-9682(193907)7:3<286:FOTES>2.0.CO;2-6
p.
286-287