1028 PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 
28 
it would be possible to develop a channel using comparative 
cost, interregional linear programming, industrial complex 
techniques centered around a balanced regional input-output 
model for three or more orders of regions or nodes. Such a 
channel could be utilized to project not only output, employ- 
ment, population, income, consumption and investment by 
region, but also the spatial allocation of decision-making 
authority and the spatial patterns of decisions, information 
collection, processing and transmission. However, all this 
development is for the future. The immediate task ahead is the 
statement of relatively simple hypotheses in ways that can 
be rigorously tested against empirical materials. 
121 Isard - pag. 26