All participants to the Study-Week have received 
all the papers in advance. At the Study-Week each 
paper has been discussed both in a group of spe- 
cialists (*) and in a plenary session, except for two 
papers (STONE and FRISCH) which have been dis- 
cussed directly in plenary session. The papers have 
been put herve in a succession which is as close as 
possible to the chronological order of presentation 
and discussion. 
(*) 1st group: StoNE (Chairman), DORFMAN, JOHNSON, 
Koopmans, MAHALANOBIS, MALINVAUD, MORISHIMA, 
PASINETTI, SCHNEIDER, 
znd group: LEONTIEF (Chairman), ArLAIS, FISHER 
FriscH, HaavELMO, IsArp, THEIL, Woup.