“…Previous studies on peer relationships, former colleagues and alumni relationships have focused only on the economic consequences of the existence of personal relationships (Cai, Xie, & Ma, 2015;Guan, Su, Wu, & Yang, 2016;Wu, Wang, & Lu, 2015). A small number of studies have focused on the impact of CEO hometown identity on corporate audit costs, but existing studies have paid more attention to the impact of the existence of CEO-managers' hometown relationship, while ignoring the impact of major characteristics of social relationships such as strength and density of the hometown relationship (Lv, Zhang, & Zhang, 2022;Yuan, Xu, Chen, Liu, & Liu, 2018). To sum up, both types of studies focus too much on the impact of the existence of personal relationships on audit quality, while relatively ignoring the impact of strength and density of personal relationships, which is not conducive to accurately grasp the panorama of the impact of personal relationships, especially hometown relationships, on audit quality.…”