Demography in disguise: Comments on "Demographic challenges and economic stagnation in Japan" by Takeo Hoshi (2026)

Tomoya Mori

MPRA Paper from University Library of Munich, Germany

Abstract: Hoshi (2026) argues that population decline accounts for only a small share of Japan's slowdown; that Tokyo's overconcentration reflects declining gross mobility, not increased one-way migration; that women's low gross migration reflects ``relative immobility''; that declining mobility is a greater demographic challenge than population decline; and that the challenge is therefore more institutional than demographic. Each of these readings inverts on closer examination. Growth accounting treats population and productivity as independent, ignoring the channels through which demographic decline shapes productivity: structural transformation, reallocation, and agglomeration. Net concentration in the Tokyo Metropolitan Area has accelerated since 2010; per-capita migration rates have risen across all age groups, the gross-volume decline reflecting the shrinking young cohort. Women flow into Tokyo more strongly than men, stay longer once there, and leave non-metropolitan regions more strongly: directional, not relative, immobility. Hoshi's prescriptions---raise mobility, abandon regional retention, focus on productivity---amount to describing a healthier Japan rather than curing the present one---a description unimpeachable as advice but silent on why Japan is where it is, or how to move it elsewhere.

Keywords: Demographic decline; Internal migration; Tokyo concentration; Gender migration; Agglomeration; Growth accounting (search for similar items in EconPapers)
JEL-codes: J11 J61 O47 R11 R23 (search for similar items in EconPapers)
Date: 2026-04-26
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