314 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
the knowledge of ¢(i - p) on its own can be used to derive only 
a single relation between ©, and &. 
Thus, for example, the statistical knowledge of Ÿ gives the 
relation (1) 
raze. y € 
314-2) ER © ©, [r-O,?-à @(?-p)] 
In other words, there is only one empirical relationship avail- 
able to determine the two parameters ©, and 8. 
The condition (?) 
5 2 
343) Re [= (i-e}-50;(i-e}] 
R_ 2 
from which a second expression could be derived, is practically 
unusable, for the variation of Ro/Rey With 7 and p is second- 
order and completely negligible by comparison with the in- 
fluence of the other factors determining the level of real con- 
sumed income. 
Alternatively, we could think of using one of the two rela- 
tions (3) (4) 
(314-4) 
(314-5) 
®~ ©, [r-0,(i-p)-28@,(:-p)] 
®~ 0,[1-0,i-23 6,4] 
Relation (240-11). 
Relation (240-13). 
y Relation (240-5) and (240-6). 
4) We have 0—0 ~ (142 8) 02 pn 
11] Allais - pag. 118