Several aspects of the notion of model connectedness are examined. Connectedness is defined as the property of the system elements (economic industries or ecological components) of being interdependent and is measured by the volume of total intermediate flow. The concept of total flow is reviewed and applied as a basis for calculation of a number of indexes, such as the average total flow coefficient and the average internal multiplier, both of which are sensitive to (1) number, (2) diversity, and (3) volume of input — output linkages and express approprialely the overall connectedness.
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