720 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
The functions © (t, 0) and 9 (t, 0) define the capitalistic 
structure of the economy. 
Average production and amortization periods 
112. Taking into account the relations (111-3) and (111-4), 
an average amortization period ® and an average production 
period ® can be defined by the following formulae: 
(112-1) 
(112-2) 
9() = [ 7 Dep(2, 6) d 9 
o() = [ b(2,0) d0 
Income and Capital 
I13. From the definitions which have been given above, con- 
sumed national income (total consumption) at factor cost is 
ojven as 
(113-1) 
LL, 
a. 
od 0 
I 
[ 
() If the global production function with respect to primary inputs is 
homogeneous of order k and if pricing is nronortional to marginal cost 
[11] Allais - pag. 24