“…This result is in line withPark and Santos-Pinto (2010) where players' ratings were used as a measure of their skill.36 Effectiveness of the joint action of self-chosen goals and real monetary incentives in higher education is shown in Herranz-Zarzoso and Sabater-Grande (2018).37 Examples areKruger and Dunning (1999),Grimes (2002),Falk and Knell (2004),Svanum and Bigatti (2006),Andrews et al (2007),Nowell and Alston (2007),Burns (2007),Jensen and Moore (2008),Khachikian et al (2011),Armstrong (2013), Tsigaris (2013, 2015),Sackett et al (2014)Query,Serra and DeMarree (2016),Sturges et al (2016), Foster et al (2017 andClark et al (2020).…”