Altruistic behavior as a costly signal of general intelligence

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Cooperation for reputation: Wasteful contributions as costly signals in public goods (2010, background): “A third explanation is that it provides information about a person’s intelligence—intelligent people behave more altruistically in economic games (Millet & Dewitte, 2007).”
Sharing Sustainability: How Values and Ethics Matter in Consumers’ Adoption of Public Bicycle-Sharing Scheme (2016, background): “For example, consumers may purchase environmental products more for social reasons such as signaling altruism and identification with certain norms and values, especially when the behavior is in public sphere than in private settings (Griskevicius et al. 2010; Millet and Dewitte 2007).”
Materialism: the good, the bad, and the ugly (2014, background): “Somewhat similar findings were recently reported by Pieters (2013): levels of the happiness and success dimensions of materialism were positively correlated with loneliness, but the centrality dimension was negatively correlated with loneliness.”