900 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
b) differences in the level of technical education, 
c) differences in economic management in general. 
If follows immediately that the installation in Africa and 
Asia of equipment analogous to that of the U.S.A. would not 
be sufficient unless ways were found to deal with the other 
factors which make for these countries’ lower productivity (1). 
And this leads in turn to the conclusion that the general 
emphasis placed in recent years on savings and investment as 
the key to speedy development, a view held in respect of 
Europe as much as for third countries, is based on an erro- 
neous position. The factors essential to development ave com- 
pletely different. 
Fortunately, it appears that this point of view, which the 
author has propounded continuously since 194%, is now shoved 
more or less explicity, by an ever growing number of eco- 
nomists. The present study basically constitutes its theoretical 
justification. 
(Y) Arrars (1061 B) and (1062 A) 
‘11] Allais - pag. 204