“…We measure corporate innovation by using R&D expenditures as input, and minimise sample selection bias by replacing R&D expenditures with a value of zero if missing (Hirshleifer et al ., 2012). Paralleling the latest studies (Xie et al ., 2020; Helling et al ., 2020; Zhang et al ., 2020), we construct two indicators based on R&D expenditure data: the ratio of R&D expenditures to total assets ( RD_Assets ) and the ratio of R&D expenditures to revenue ( RD_Sales ). We also measure corporate innovation by the number of patent applications and construct three indicators: Patent , defined by the natural logarithm of 1 plus the total number of all patent applications; Patenti , defined by the natural logarithm of 1 plus the total number of invention patent applications; and Patentud , defined by the natural logarithm of 1 plus the total number of non‐invention patent applications, such as utility and design patent applications.…”