The Econometric SocietyEconometrica: Jul 1942, Volume 10, Issue 3
The Investment-Factor Method of Forecasting Business Activity
https://doi.org/0012-9682(194207/10)10:3/4<311:TIMOFB>2.0.CO;2-9
p.
311-316
Richard V. Gilbert, Victor Perlo
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p.
311-316
Richard V. Gilbert, Victor Perlo