“…Valuation theory, especially in the German-speaking world, can be differentiated into two competing schools of thought (as an overview Behringer, 2020;Follert, 2020a;Hering, 2004;Quill, 2016). The investment-theoretical approach (or German School, Hering, 2004, Olbrich, 2016 is based on the fundamental insights of Austrian economics in general and the Wiener Grenznutzenschule in particular (Follert et al, 2018;Herbener & Rapp, 2016;Olbrich et al, 2015Olbrich et al, , 2020Rapp, Olbrich, & Venitz, 2018). In German business economics 8 the investment theoretical approach was introduced for example by Schmalenbach (1917) 9 , Busse von Colbe (1957), Jaensch (1966), or Münstermann (1966a, and extended for example by Matschke (1972Matschke ( , 1975, Hering (1999), Klingelhöfer (2006), or Olbrich (2014).…”