This paper analyzes interregional commodity flows in order to clarify the characteristics of trade structures for the regional economy in Japan. Two types of analytical model are indicated according to two different objectives. One is to characterize the role of each industrial sector, the other is to take into account the relative connectivity of the interregional relationships under study. Even these simple models provide some useful information for regional development and planning, as demonstrated in this paper by using data from the 1970 interregional input—output table.

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