“…Following prior studies (Liu et al, 2022; Wang et al, 2023; Wang, Wang, et al, 2022), the following control variables were added to the regression model: (1) Firm ownership (SOE), measured by setting the value of state‐owned enterprises as 1 and others as 0; (2) Whether it is one of the four largest (Big4), audited by the Big 4 (PwC, Deloitte, KPMG, Ernst & Young) was 1, otherwise it was 0; (3) Financial leverage (Lev), measured by the ratio of annual average total liabilities to annual average total assets; (4) Management expense ratio (Mfee), measured by the ratio of administrative expenses to operating income; (5) Number of directors (Board), measured by the natural logarithm of the number of board members; (6) Shareholding ratio of the largest shareholder (Top1), measured by the ratio of the number of shares held by the largest shareholder to the total number of shares; and (7) Firm age (Age), measured by the logarithm of the number of years from the date of incorporation to the observation date plus one.…”