“…At the macro-level, the methodology of Xin and Xin (2017) and Song et al (2024) was adopted, using the provincial marketization index as a control variable, which included the combined relationship between government and market relationships, the development of the non-public economy, the degree of development of product markets, the degree of development of factor markets, and the development of market intermediary organizations and the legal institutional environment. The index is derived from the Marketization Index of Chinese Provinces-the National Economic Research Institute (NERI) report compiled by Wang et al (2017), which provides the most authoritative information currently available to Chinese scholars to assess the degree of marketization and has been widely used to investigate the external impacts of firms in different situations; in addition, concerning previous studies (Tian et al, 2023;Zhang and Zhao, 2023) at the firm level, this study incorporates firm size (Size), the number of years since listing (Age), the gearing ratio (Lev), the net profit margin of assets (Roa), growth, the proportion of fixed assets (Fixed), the value of Tobinq (TobinQ), the proportion of independent directors (Indep), and whether it is audited by the Big Four (Big4) accounting firms, which are considered to be potentially influential. The specific measurements are shown in Table 1.…”