The Econometric SocietyEconometrica: Jul 1938, Volume 6, Issue 3
Differential Effect in the Butter Market
https://doi.org/0012-9682(193807)6:3<270:DEITBM>2.0.CO;2-D
p.
270-284
Irma Hilfer
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p.
270-284
Irma Hilfer