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 con- 
sumption 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 sec- 
tors (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