2025 年 34 巻 1 号 p. 135-145
The elimination of child poverty remains a critical challenge in achieving Sustainable Development Goal 1. Recent studies have highlighted the plurality of parent-child relationships acting as a safety net for children. In this paper, we examine the functionality of child migration practices, such as customary adoption and fosterage. We model child migration as a network facilitating the transfer of financial resources and assess the likelihood of children falling into poverty through numerical experiments. Our results demonstrate that child migration creates mutual aid networks, effectively reducing child poverty. Furthermore, we theoretically show that child migration can facilitate wealth redistribution within society. This approach enhances our understanding of child migration's functionality and contributes to achieving the sustainable development goals.