Have you ever wanted to take a peek at IMPLAN’s Trade Flow data? Have you been curious about the details of IMPLAN's Gravity Model and Trade Flow RPCs? Then this might be the place for you!
IMPLAN’s domestic Trade Flow data set is comprised of county-to-county dollar values of domestic trade in all IMPLAN commodities (including services). The data are estimated via a doubly-constrained gravity model. The trade captured by this dataset is for both intermediate and final uses, and includes trade within a county (a county to itself). Cool right?
The gravity model was originally adapted from Newton’s Law of Gravity! This law states that the attraction between two masses is directly related to the size of the masses and inversely related to the distance between them. The gravity model was first suggested in an I-O context in Leontief and Strout (1963). In the last fifty years, the gravity model has been widely used to predict trade flows (Federal Highway Administration, 1977, p. 118; Anderson and van Wincoop, 2003; Anderson, 2011).
In 2005, IMPLAN, in concert with the U.S. Forest Service, developed a sophisticated doubly-constrained (until all supplies go somewhere and all demands are fulfilled) gravity model to estimate trade flows for all IMPLAN commodities between all counties in the U.S. These Trade Flows show the movement of goods and services between and within counties or user-defined regions made up of counties. .
A key aspect of the data set is that the trade is on an origin-of-production basis, not an origin-of-movement basis. This means that the data set tracks from where a Commodity is produced to where it is consumed as either an intermediate or final use rather than from where a Commodity begins its export journey.
Each year, the IMPLAN database is used to create the attracting masses (supply and demand) for each U.S. county and each Commodity. These county masses are combined with distances (cost of transport indexes) between and within counties by mode of transport from Oak Ridge National Laboratory’s (ORNL) Transportation Network. The model is calibrated using distances traveled by Commodity from the most recent Commodity Flow Survey (CFS).
DATA DELIVERY & SUPPORT:
Data is delivered as a SQL .bak file or a .csv file. These files contain a single table with all county-county pairs and all Commodities. In this table, the counties are indexed from 1 to 3141 with no associated FIPS codes. A bridge table is included to match the county index to the appropriate FIPS code.
Access to the IMPLAN Trade Flow Data is protected with a custom license agreement. The license agreement will be presented when you are ready to purchase data. Sorry, the lawyers make us do it.
READY TO MODEL:
To learn more about purchasing our Trade Flow data, please contact IMPLAN at 800-507-9426 or firstname.lastname@example.org.
Varnado, D.A. & Fannin, J.M. (2018). Finalizing and Describing New Economic Impact Areas for the Gulf of Mexico Region. OCS Study, U.S. Department of the Interior Bureau of Ocean Energy Management, BOEM 2018-014.
Written November 20, 2019