“…In addition, previous studies suggest that risk-taking in early life increases in the presence of observers (Gardner & Steinberg, 2005). In the domain of time preferences, Mischel and colleagues, in their development of the Marshmallow test, pioneered a large body of work on delay discounting in children (Mischel, 1961), which generally documents increasing levels of patience with age (Bettinger & Slonim, 2007; Green, Fry, & Myerson, 1994; Qu, Shan, Yip, Li, & Zelazo, 2012; Steinberg et al, 2009). In addition, some work finds that boys are more impatient than girls (Castillo, Ferraro, Jordan, & Petrie, 2011; Qu et al, 2012), and that the socioeconomic environment likely influences time preferences, such that those from affluent backgrounds are more likely to delay gratification (Freire, Gormana, & Wessman, 1980), in line with the adult literature.…”