SEMAINE D’ETUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIOUE ETC. 
1054 
At the same time there is a second proposition according to which 
real national income has a maximum. whatever the level of real 
capital. 
Of course, this model in no way constitutes a proof, but at least it 
supports the fact that the two propositions are absolutely different. 
It also shows that it is impossible to derive a general property of the 
production function, from the fact that the capital output ratio is 
practically constant, according to which real national income would 
be proportional to real capital. Thus from a theoretical point of view 
it 1s impossible to deduce proportionality between real national in- 
come and real capital from the fact that in certain circumstances we 
can observe an apparent constancy of the capital output ratio. 
From an empirical point of view the empirical researches of Dou- 
glas and his followers have shown that we can write at least as a 
first approximation 
R = KLeCt 
where R is real national income, L labor. C real capital, anc 
x, {3 constants. 
The Douglas results have been very much discussed but there 
is one point which has never been contested This is that the order 
of magnitude of the elasticits 
41 
Leontief - pag. 21