as people get richer
: Paul K. Piff, Michael W. Kraus, Stéphane Côté, Bonnie Hayden Cheng, and Dacher Keltner, “Having Less,
Giving More: The Influence of Social Class on Prosocial Behavior,”
Journal of Personality and Social Psychology 99 (2010):
771–784.
spend the money on others
: Elizabeth W. Dunn, Lara B. Aknin, and Michael I. Norton, “Spending Money on Others Promotes
Happiness,”
Science 319 (2008): 1687–1688.
warm glow
: James Andreoni, William T. Harbaugh, and Lise Vesterlund, “Altruism in Experiments,” in
New Palgrave Dictionary of
Economics, 2nd ed., ed. Steven N. Durlauf and Lawrence E. Blume (New York: Palgrave MacMillan, 2008).
neuroscience evidence
: William T. Harbaugh, Ulrich Mayr, and Daniel R. Burghart, “Neural Responses to Taxation and Voluntary
Giving Reveal Motives for Charitable Donations,”
Science 316 (2007): 1622–1625; and Jorge Moll, Frank Krueger, Roland Zahn,
Matteo Pardini, Ricardo de Oliveira-Souza, and Jordan Grafman, “Human Fronto-Mesolimbic Networks Guide Decisions about
Charitable Donations,”
PNAS 103 (2006): 15623–15628.
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