Industry-Specific Correlations Between the Demand for Transportation and Communications in the U.S. Economy, 1947-1997

This study analyzes the industry-specific correlations between the demands for transportation and for communications across time (1947-1997) in the U.S., using input-output accounts provided by the U.S. Department of Commerce. We analyzed five pairs of Spearman correlations of transportation and communications outputs (involving utilities, manufacturing, and overall) for each of 79 industries in the mid-level classification system, using the twenty direct and total coefficient tables from benchmark input-output years (1947-1997). We then averaged the correlations within top-level industry to show how the relationships between transportation and communications differ across the nine top-level industries. Since the I-O coefficients are based on current monetary values, a GDP deflator is used to obtain constant dollars for each benchmark year. With respect to the total coefficients, we found a strong pattern of complementarity across all nine industry categories and for all five pairs of commodity-specific correlations. With respect to the direct coefficients, we also found a uniform pattern of complementarity for four out of five pairs of correlations, across all top-level industries. Thus, from an industry perspective, it is not realistic to expect communications to substitute for travel. Nevertheless, further research using a more disaggregated price index (e.g. the Producer Price Index) is needed to validate the observed pattern of complementarity between transportation and communications.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 21p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01047507
  • Record Type: Publication
  • Report/Paper Numbers: 07-2385
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 7:04PM