300 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 78 
to be that they are unachievable and not that the problem becomes 
ill-defined. 
Despite the fact that I am unable to agree completely with Prof. 
KooPMANS’ conclusions, however, I should like to state that his paper 
like that of Prof. MALINVAUD is a pleasure to read and to listen to. 
The two papers set a standard that one wishes all the other papers. 
and discussion in this Study Week had met. 
4] Koopmans - pag. 76