“…The spatial lag Durbin model applied in this study is inherently related to the diffusion theory of fertility decline. Recently, some studies have already recognised the usefulness of spatial statistical methods for demographic research (Evans & Gray, 2018; Goldstein & Klüsener, 2014; Sabater & Graham, 2018; Vitali & Billari, 2017; Wang & Chi, 2017; Yu et al, 2020). The exploration, however, merits further investigation to better understand the nature and dynamics of demographic variations in China, where extremely rapid changes are underway in economic, social, and demographic realms.…”