“…CEO overconfidence is relatively mature in the study of M&As, although previous works have only done univariate studies. CEO overconfidence is also widely used in other management research, including ambidextrous innovation (Wong et al, 2017), diversification (Andreou et al, 2019), big baths (Pierk, 2021), overinvestment (Kwon et al, 2021), and firm risk (Ali and Tauni, 2021). Many quantitative indicators have been used in the measurement of CEO overconfidence in the literature; for example, CEO shareholding (Malmendier and Tate, 2008), the relative compensation of CEOs (Huang et al, 2011), historical business performance, frequency of CEO M&As (Doukas and Petmezas, 2007), weight of manager personal characteristics (Barber and Odean, 2001), business climate index (Yu et al, 2006), CEO evaluation by mainstream media (Malmendier and Tate, 2008), and earnings forecast bias (Lin et al, 2008).…”