人口减少与区域的消失：应对之策
第四集：城市秩序是如何形成的

Building on Story 3, which demonstrated how cities emerge as population agglomerations in a regional economy with industries exhibiting varying returns to scale—resulting in city size disparities and the emergence of nested core-periphery structures—this paper (Story 4) assumes that the returns to scale across industries follow empirical distributions. We show, in a theoretical model, how such nested structures can reproduce self-similar patterns consistent with the power-law distribution observed in city populations.