742 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28

The first of these relations is usually used to calculate SR.
In nominal value, the expression for national income is
equal to

°

bh

R

at market prices, and to

> y *

at factor cost. But by (117-9)

(117-11)

4B  IBRj
yY YR,

whence it follows from (117-6) and (117-7) that

(117-12)

YbB = 1 SyY
b

If we consider here only the expression for national income
at factor cost. we have

(117-13)

R

= Yay

[Ir] Allais - pag. 46