564 
PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
increasing the proportion of active population (more working 
women or later retirement ages). 
These flexibilities evidently represent very important factors 
in allowing the system the possibility of adjustment and of 
keeping stability in the short run, in face of disturbances of 
various kinds. 
io] Pasinetti - pag. 04