SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIQUE Erc. 801 
KE. 
— CASE OF AN EXPONENTIAL DECREASE 
OF ELASTICITY j(6) 
Hypothesis (d): The ratios of the elasticities of primary inputs 
depends only on their distance in time 
250. If the assumption is made that the ratio of the pro- 
ductivities of two inputs supplied at moments 6, and 6, (f 
depends only on 6, - 6,, then considering three moments 
and 0,(0,<0,<{0,) we have from (2r 
250-1) B(03 - 6,) = B(03 - 05° B(9- 
From the above it follows that 
(250-2) 
3(0) =Ae-"® 
[hen from the relations (211-3) and (220-f, 
250-3) 
250-4, 
+] Allais - pag. 103%