Econometrica: Apr 1936, Volume 4, Issue 2

The Marginal Efficacy of a Productive Factor--First Report of the Econometrica Committee on Source Materials for Quantitative Production Studies

https://doi.org/0012-9682(193604)4:2<123:TMEOAP>2.0.CO;2-5
p. 123-137

E. H. Phelps Brown

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