“…Thus, while some researchers argue, and find empirically, that ownership structure is related to firm performance (Morck et al, 1988;McConnell and Servaes, 1990;Hermalin and Weisbach, 1991;Gugler and Yortoglu, 2003), others disagree and contend that controlling for an alleged endogenous relationship between the two variables there is no such effect, and also find empirical support for their position (Demsetz an Lehn, 1985;Himmelberg et al, 1999;Demsetz and Villalonga, 2001;Coles et al, 2012). On the other hand, while some researchers find that the size or composition of the board of directors is related to firm performance (Baysinger and Butler, 1985;Rosenstein and Wyatt, 1990;Yermack, 1996;Callahan et al 2003;Duchin et al 2010), others do not find such relationships (Fosberg, 1989;Hermalin and Weisbach, 1991;Bhagat and Black, 2002). Moreover, in this last literature there is an important debate concerning the direction of causality.…”