SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIQUE ETC. 929 
1 
PARTICULAR CASES 
4. THE DEVELOPMENT OF {3(6)e*’ REDUCES TO THE n'® TERM 
(n'>2) (PARA-EXPONENTIAL MODEL) 
Hypotheses 
520. With the exception of the exponential model (n=1, 
the simplest variant of the general case which has just been 
studied corresponds to the equalities 
(520-1) 
Rd 
; 
520-2) 
For want of a better term, this will be denoted as the para 
exponential model (1). 
Expressions for the main quantities 
521. We have 
(521-1 
) 
u” 
(') For n=1 these formulae correspond, of course, to the exponenttal 
model ($ 250). 
(11] Allais - pag. 233