Abstract
ABSTRACT This study uses Federal Express Corporation data to examine information flows among 48 large metropolitan areas in the United States. Set within the context of emerging quaternary location theory, three hypotheses are introduced to explain the bases for information flows among metropolitan areas: information genesis, hierarchy of control, and spatial independence. Essential support is found for all three hypotheses. Supply considerations, rather than demand, are fundamental in information genesis; flows are strongly asymmetrical, reflecting a marked hierarchy of control; and distance plays a minor role in the spatial configuration of flows, especially at the highest level of the metropolitan hierarchy. New York, in particular, dominates the national structure of information flows, and only ten metropolitan areas act as command and control centers, creating a highly asymmetric flow in which these ten centers originate a high proportion of total flows. Principal components analysis identified five ...
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