SEMAINE D'ÉTUDE SUR LE ROLE DE L'ANALYSE ECONOMETRIQUE ETC. 701 
rt 
: QUASI-STATIONARY PROCESS WITZ 
CONSTANT GROWTH RATES 
Hypothesis of Invariance of the Function clé, 0) 
130. If in addition to the conditions already discussed, 
condition that the function ot, 0) is invariant is postulatea, 
can easily be shown that the rates i(t) and c(t) must be constan* 
For by hypothesis 
130-1) 
£(:, 8) = 16, 
whence, from (i. 
130-2) 
But the left hand member is dependent only on i, and ., . 
‘ight hand member only on #-6. It follows that 7 muse be 
constant and from :20-1) the same is true of the rate of in 
‘erest 1. 
Thus we hav 
Allais - pag. v,