788 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
and 
O° [LR]. +, 49li) x de(i) 
(228-7) 7 3 |e ir | o(i) di? 
Taking relations (220-7), (220-8), (220-9) and (220-13) into 
consideration, we have 
(228-8) 
LR 
[LR |= 
FB 2 
228-0) or | LR] = (1-24), < O 
for 71=o0 
for 
1=0 
Thus at any instant, Ro is a maximum if 
(228-10) 
> 
7 
N 
Therefore we have 
(228-11) R. is a maximum for 1(t) =¢(t) 
Writing Rey for the maximum value of real consumed na- 
lional income for =0 we have from (228-5) 
228-12) 
=e [5 “ 
CM (ip) 
11] Allais - pag. 92