ABSTRACT
Input-output models are analytical frameworks incorporating detailed information about applied production technologies, interindustry transactions, and final purchases. First developed and implemented by Wassily Leontief as a system for the empirical study of national economies, the analytical form has been developed by many users into a family of frameworks addressing a broad range of tasks. National input-output tables for the United States economy are regularly prepared by the Department of Commerce for quintennial census years. Since final demand is a sectoral disaggregation of gross national product, it may be presented in terms of component parts, that is, vectors of sectoral consumption, investment, net exports, and government spending. Assumptions on which statistical models are built may often be based on very limited knowledge. The extent to which the accuracy of a model may be affected by given deviations from assumptions is an important general question.
