Biblioth~k des Instituts 
fiir Weltwirtschaft Kiel 
SEMAINE D’ETUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIQUE ETC. 13 
need to be more accurate than those we have at present and we 
can try to find out what relationships in the model are really im- 
portant for the main purposes for which we want to use it. But if 
we build models, put them in journals and allow them to be forgot- 
ten, if we do not keep them up to date and if nobody builds on them, 
I do not think that we shall ever get satisfactory applied economics 
1] Stone - pag. 111