“…First, other possible compensation contracts have been considered where revenues are replaced by market shares (see, e.g., Jansen et al, 2007;Kopel & Lambertini, 2013;Ritz, 2008) or by relative profits (see, e.g., Salas Fumas, 1992, Aggarwal & Samwick, 1999, Chirco et al, 2011, Miller & Pazgal, 2001, 2002. For the duopoly case, a comparison of the different compensation contracts has been provided by Jansen et al (2009Jansen et al ( , 2012. Second, mixed markets have been studied where some firms are governed by managers whereas others are run by the owners themselves (see, e.g., Basu, 1995;Tseng, 2002).…”