SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIOUE ETc 
In this particular example all operating expenses would 
clearly be investment outlays, and a clear cold light would be 
thrown on the lack of symmetry of the usual definitions. 
Real Consumed Income 
(17. If it be assumed that real consumed income Rc (t) is a 
function of factor inputs 7,d® i.e. a functional 
117-1) 
R, (t)=a(t)F[R,(¢)& (,0]] 
=a (t)F[R,, (8) ¢ (¢-6,8)] 
of the function (111-6) 
Rul(t) #(8,0)=R,(t-0)e (#-0,0, 
and if it is also assumed that this functional is of k-order 
homogeneity, then 
117-2) R, (t)=0 (e)[R()1* G[#(4,6) 
In this discussion, x(#) is used as a coefficient which char- 
acterises the rate of technical progress. 
11] Allais - pag. 43