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.
Americans over age twenty-four
:
Peggy A. Thoits and Lyndi N. Hewitt, “Volunteer Work and Well-being,”
Journal of Health and
Social Behavior
42 (2001): 115–131.
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