Document Type

Working Paper

Publication Date



Regional Research Institute

Document Number

Research Paper #2002-14


Regional Research Institute


Many issues arise in the construction of interregional SAMs. In the US, a convenient point of departure is the foundation provided by commodity-by-industry subnational SAMS that can be generated from IMPLAN data. Unfortunately, because the SAMs are generated independently, there is no guarantee of consistency with known national totals. In particular, the sum of IMPLAN generated domestic regional exports across all regions will equal the sum of IMPLAN generated domestic regional imports only by chance. Additionally, while IMPLAN generates total domestic imports and total domestic exports for each region, the analyst must devise an acceptable method for distributing interregional domestic trade. These and other issues that arise in the organization and estimation of the interregional SAM are addressed in this paper.