396 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
Naturally, this model proves nothing so far as the analysis 
of the comparative productivity of the American and French 
economies is concerned (!). It shows merely that a type of 
reasoning which is generally considered as very attractive may 
be completely false. 
Analysis of the Difference in Productivity between the French 
and American Economies 
133. Equipment, as we have just seen, plays only an inter- 
mediate role in the analysis of productivity differences between 
the American and French economies. If is the capitalistic 
structure which it is important to study. 
The capitalistic structure is represented by its characteristic 
function 
|$(z,06) 
D't 6)dh 
which describes the time distribution of the inputs of primary 
income used in the past emerging in the consumed national 
income of instant /. There is everv reason to believe that this 
() I should particularly stress that in my opinion greater American 
productivity cannot be explained by a higher aualitv of the labour force 
‘herve. (See AILAIS. 1060 B. p. 33). 
‘111 Allais - pag. 200