SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIOUE ETC. 85

follows from the invariante of the composition of the labor
force (1).
Any assumption concerning the amortisation function <(6)
of primary income can therefore be tested against observed
realitv from three points of view:

2) The composition of global production P* in terms of consumption
 goods and investment goods, and the amortisation
schedule for investment goods and durables;
b) The structure of reproducible capital;
cr) The composition of the labor forc..

3) The shape of the amortisation schedule ç,(6) for any
particular economic sector i generally bears little relation to
an exponential curve, at least for sufficiently low values of 6.
7:(0)d0 represents the share of primary income which will
emerge in consumed income during the interval 6 to 6 +de.
But, taking steel manufacture as an example, the industry’s
output can only enter final consumption after a period of at
least some months; it must first pass through a number of
intermediate stages. It follows that primary income absorbed
by the steel industry can only emerge into final consumption
after a certain lapse of time. The function ¢(8) thus starts
with a value of zero, grows, reaches a maximum and then
declines. The same is true of the majority of economic sectors
 (3).
Naturally,

333-1)

R.ÿ(0) = 4 R oi 9,"

where R,; 1s the primary income devoted to sector

() § 120.
() The shape of the majority of ¢(0) functions is therefore similar to
that of the function « (0) which corresponds to the para-exponential model
>xamined in annex (Section II A, $ 520 to 524).

- oq

Allais - pag. 135