Abstract
Abstract This paper reviews the traditional input-output models and analyzes their potential problems and preliminary improvement research. According to the principle of the national economic accounting system, foreign departments are added in the first quadrant of the traditional input-output table. The biochemical input-output model of import and export solves the import and export problems that have plagued the input-output research, and integrates and expands the advantages of import tabulation matrix, MRIO and other tables and models. It has laid a solid foundation for correctly using input-output data to analyze national economy, regional economy and global economy. JEL classification numbers: E16. Keywords: Import, Export, Input-output Table, Input-output Model, Foreign Sector.
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