... The central question we address in this study is: What is Knightian Uncertainty? For more than a century, Frank Knight's (1921) foundational work in RUP has been instrumental in shaping how economics (e.g., Ellsberg, 1961;Lawson, 1988;Luce & Raiffa, 1989), organizational (e.g., Duncan, 1972) and entrepreneurship (e.g., Busenitz & Barney, 1997;McMullen & Shepherd, 2006;Sarasvathy, 2001;Townsend et al., 2018) scholars theorize the role of uncertainty. In the field of entrepreneurship, Knight's theory of uncertainty has substantially shaped and informed the development of virtually all of the field's most prominent theories and literatures; a small sample includes actualization theory of opportunities Ramoglou, 2021;Ramoglou & Tsang, 2016), entrepreneurial orientation (Miller, 2011), entrepreneurial cognition (Busenitz & Barney, 1997), effectuation (Sarasvathy, 2001), entrepreneurial action (McMullen & Shepherd, 2006), creation theory (Alvarez & Barney, 2007), and judgment-based analysis (Foss & Klein, 2012). ...