“…Different from the traditional risk framework with known probability distributions (‘risk’), we focus on the analysis of corporate decision‐making under the unknown unknowns. Meanwhile, different from the existing studies focusing on the impact of Knightian uncertainty on asset pricing, forecasting and financial risk management (Chen, Chung and Lin, 2014; Corsi et al. , 2008; Drimus and Farkas, 2013), as well as relatively few studies concerning Knightian uncertainty on corporate R&D investment decisions (Amoroso, Moncada‐Paternò‐Castello and Vezzani, 2017) and cash holdings (Goodell, Goyal and Urquhart, 2021), we mainly explore corporate opportunistic earnings management under Knightian uncertainty.…”