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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, employment,
 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