摘要: This report presents the findings of research on the intertemporal stability of interregional commodity flow coefficients. These coefficients represent the share of the consumption in each state (region) of each commodity group th... 展开 This report presents the findings of research on the intertemporal stability of interregional commodity flow coefficients. These coefficients represent the share of the consumption in each state (region) of each commodity group that is accounted for by each state (region) of origin. These coefficients are used in multi-regional input-output models to link the regional economies. These links transmit the impacts of production in each state on input supplying industries within the state and in other states. Thus, these coefficients are vital in tracing the regional output and employment impacts of projected changes in the demand for final products. The models work best when the coefficients are relatively stable over time, or when changes in the coefficients are predictable. Unfortunately, the research results indicate much less stability in the coefficients than is desirable. The stability was measured using data for 1967 and 1972 (and in a more limited fashion using data for 1972 and 1977) from the Commodity Transportation Survey of the Census of Transportation, covering only manufactured products of domestic origin. 收起