摘要: |
This paper presents four measures of transportation's economic importance, namely, transportation industry's gross domestic product (GDP), transportation final demand, transportation related GDP, and transportation driven GDP. All four of these measures are conceptually consistent with the framework and accounting rules of the Systems of National Accounts and are statistically comparable to the GDP. With each targeted at a different aspect of transportation, together the four measures provide a complete frame of reference for the size and importance of transportation in the U.S. economy. |