Smiles when sharing

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Naturalistic observations of smiling and laughter in human group interactions (2008, background): “…care (Ambrose, 1961), a greater leniency from judges after committing minor offences (Forgas et al., 1983; LaFrance & Hecht, 1995), monetary benefits (Tidd & Lockard, 1978; Brown & Moore, 2002), and positive social judgements (Otta et al., 1994; Bachorowski & Owren, 2001; Mehu et al., 2007).”
Honest signaling in trust interactions: smiles rated as genuine induce trust and signal higher earning opportunities (2015, background): “Mehu, Grammer, and Dunbar (2007) suggest that human smiles are more prevalent in situations that involve sharing or exploitation of resources.”
Emotional expressivity as a signal of cooperation (2010, background): “Just as displays of positive emotion signal altruism in pro-social situations requiring cooperation and sharing (Mehu, Grammer, & Dunbar, 2007), negative emotion elicited by pro-social preferences such as contempt or disgust in the face of unfairness can also signal cooperative tendency in specific…”
Anger and happiness in virtual teams: Emotional influences of text and behavior on others’ affect in the absence of non-verbal cues (2011, background): “Mehu et al. (2007) similarly found a correlation between cooperation (in that case, sharing of a financial reward) and smiling.”