“…Prior studies have proposed various top‐down and bottom‐up approaches to measure investor sentiment (e.g., Aboody et al, 2018; Baker & Wurgler, 2006; Berkman et al, 2012; Da et al, 2015; Guo et al, 2019; Huang et al, 2015). The sentiment indices constructed from market‐level variables proposed by Baker and Wurgler (2006), Da et al (2015), and Huang et al (2015) are categorized as a top‐down approach, while those defined by Berkman et al (2012), Aboody et al (2018), and Guo et al (2019) are based on individual stock overnight returns and are thus a type of bottom‐up approach. On the basis of the conceptual idea of the bottom‐up approach, this study employs overnight returns of industry exchange‐traded funds (ETFs) to measure investor sentiment.…”