Post-WWII large-scale population movements in Japan have created a significant geographical divide between testators and heirs, revealing a social issue known as “long-distance inheritance.” This study quantitatively analyzes the impact of this phenomenon on financial asset flows using organized inheritance data. By clarifying the geographical distribution of heirs and the pathways of financial asset transfers, we provide numerical evidence that the outflow of assets from rural to urban areas exacerbates regional disparities and accelerates the concentration of wealth in Tokyo. This research reveals that the net outflow of financial assets associated with inheritance is diminishing the vitality of local economies, suggesting the need for fundamental measures to address the economic consequences of these demographic shifts.

This study estimated the number of shopping-disadvantaged older adults and evaluated shopping support policies in Kumagaya City, Japan. Accessibility analysis using an OpenStreetMap road network classified the city into walkable (≤500 m from a food access point) , transit-accessible, and access-difficult zones. Shopping-disadvantaged older adults were defined as non-driving residents of access-difficult zones and estimated by areal weighting. Using projected populations for 2025-2070, we compared existing stores only, stores plus 60 mobile-retail stops, and stores plus 109 public facilities as candidate stops. The walkable share of municipal area increased from 4.2% to 14.8% and 21.6%, reducing the estimated number by 16.0% and 21.5%, respectively, in 2025. Per-location efficiency was initially higher for mobile retail, but the public-facility case surpassed it in 2055. The estimated number peaked in 2040 and declined only modestly thereafter despite the overall population decline. This framework integrates mobile-retail accessibility with future population projections.