“…Males invest more than females in most of the experiments analysed, and such a difference is usually about 10 − 15% of the initial endowment (Charness and Genicot, 2009;Charness andGneezy, 2004, 2010;Dreber and Hoffman, 2007;Dreber et al, 2010;Ertac and Gurdal, 2012;Fellner and Sutter, 2009;Gong and Yang, 2012;Langer and Weber, 2004). Significant differences, but lower than 10% in size, appear in Haigh and List (2005), Bellemare et al (2005), and Crosetto and Filippin (2013b), while Gneezy et al (2009) is the only contribution in which a gender gap does not appear.…”