SEMAINE D'ÉTUDE SUR LE ROLE DE L ANALYSE ECONOMETRIQUE ETC. 02" 
It may be recalled that according as A is below or above 
unity, amortisation is more or less rapid than in the exponen- 
tial model (1). 
Value of € 
SIQ. 
(519-1) 
From the limited expansion (314-6) we have 
A - 
fo> 872i -p, 
[f it be assumed that 
(510-2) 
‘y 
a condition which is met in the majority of cases, then 
(510-3) ter Ze (imp <@ <r in 
To see this more specifically, consider the case of the United 
States for which 
(510-4) 
(> 
336. 
x1 | Allais - pag. 231