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OUR empirical knowledge of the demand and structural interrelationships of the economy at the regional level is indeed limited. Some understanding of these interrelationships can be gained through (1) the economic base-foreign trade multiplier approach,(2) the regional interindustry (input-output) approach, and (3) various other approaches, involving linear programming and the like, which are not of concern here.'Although the interindustry approach seems superior to the base-multiplier approach for most, though not all, purposes, the real difficulty lies in translating either approach into an operational one so that meaningful estimates of these interrelationships can be gen-erated at a reasonable cost. This is a rather unfortunate state of affairs because it means that decision makers have no firm guidelines to use in attempting to assess the impact of autonomous demand forces upon regional economies or specific …