750 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
so that 
(122-3) 
+. 4Re _p tt) 
R. Zi 
and finally from (120-1) and (122-1) 
(122-4) 
Ro(t)=Ra(f) for i(t)=p(t) 
Reproducible Capital 
123. In the same way from (113-5) 
(123-1) 
C(t)=R_ (1) a fe 0e (0)d 6 
so that 
(123-2) 
1 dC 
Le oft 
= p(t) 
thus from (122-3) and (123-2) 
(123-3) 
dy _4 Cl _, 
dt © dt R(t) 
fIT] Allais - pag. 54