2025 Volume 35 Pages 12-19
This study employed principal component analysis to categorize regional structures in the Tokyo metropolitan area, using 22 geographical and social indicators across 30 regions. “Regional blocks” defined in the Heisei-era merger promotion plans served as the analytical units. A cluster analysis of the first principal component classified these blocks into four types—central cores, sub-central cities, functional cores, and peripheral hubs—indicating a hierarchical metropolitan structure. The potential for wide-area collaboration within each type was then explored. The findings suggest that functional cores should promote policy coordination by leveraging existing resources, whereas peripheral hubs should address challenges independently and build sustainable networks. Overall, regional blocks can serve as foundational units for wide-area cooperation and offer an alternative to mergers. Future research should apply this framework to other regions to deepen our understanding of inter-municipal collaboration.
