772 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
and the rate of interest is a constant, 7’ 
(210-1) 
W(t) - p(t) =7 
Hypothesis (b): Constant Production Elasticities 
211. Af anv moment t, the elasticities B(0) of real consumed 
income with respect to primary inputs r:d0 can be considered 
as being constant over a wide range and independent of the 
moment t considered. 
As we have 
(211-0) 
8(0)- ZR 
R. 
we see that, on this hypothesis, real consumed income Ro(?) can 
be represented bv the function 
(211-1) LR,(#)=La(t)+/"8(0)LF da 
(') These assumptions hold in the case where the process considered 
respects hypothesis (c) in my article in « Econometrica » (ALLAIS, 1962 A) 
Le. hypotheses 1-7 of the second version of my paper for the Cambridge 
Conference (ALLAIS, 1963) Some Analytical and Practical Aspects of the 
Theory of Capital. 
(3) The operator I. represents the natural logarithm. 
11] Allais - pag. 76