The Econometric SocietyEconometrica: Apr 1952, Volume 20, Issue 2
On a Relation Between Changes in Demand and Price Changes
https://doi.org/0012-9682(195204)20:2<304:OARBCI>2.0.CO;2-D
p.
304-305
Abraham Wald
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p.
304-305
Abraham Wald