http://www.sciencedaily.com/releases/2014/01/140129115151.htm

Altruistic acts more common in states with high well-being

Summary:
People are much more likely to decide to donate a kidney to a stranger -- an extraordinarily altruistic act -- in areas of the United States where levels of well-being are high, according to a new study published.

Journal Reference:
Kristin M. Brethel-Haurwitz Abigail A. Marsh. Geographical Differences in Subjective Well-Being Predict Extraordinary Altruism. Psychological Science, January 2014