“…For example, Harbaugh and colleagues (2003) found that proposers in the UG offered better outcomes as they grew older, whereas Murnighan and Saxon (1998) found the opposite. Similar mixed results on age and sex have been found in recent contributions in adults (e.g., Carpenter, Burks, & Verhoogen, 2005;Eckel & Grossman, 2008;García-Gallego, Georgantzís, & Jaramillo-Gutiérrez, 2012;Saad & Gill, 2001;Solnick, 2001). In children, sex differences have not been explored (e.g., Güroglu, van den Bos, & Crone, 2009;Sutter, 2007;Wittig, Jensen, & Tomasello, 2013).…”