SEMAINE D'ÉTUDE SUR LE ROLE DE L'ANALYSE ECONOMETRIQUE ETC. 
g. 
so that accordins ‘” ‘51: 1° 
(515-3) 
le 
(515-4, 
whatever the value of IX. This result is a ve. -markable 
one; it is due to. the fact that in this case the mod ‘ reduccs 
to the exponential model 
For, from (511-1) we have 
+ 
Gu, 
s(n 
515-5) 
which gives finally 
(515-6) 
- 
11: Allais - pag. 219