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The economic base of a region has been discussed at hoth the theoretical and the empirical level. At the theoretical level, some efforts have been directed at an integration of base theory with more general economic theory, either foreign trade multiplier or input-output models. A t the empirical level, data limitations have forced most studies to use employment as the magnitude to be investigated. 2 It is desirable, however, to set up an empirical model measuring income in dollars.