http://www.jstor.org/stable/2234133?seq=1#page_scan_tab_contents
http://www.nature.com/nature/journal/v425/n6960/abs/nature02043.html
. Depending on the environment, a minority of altruists can force a majority of selfish individuals to cooperate or, conversely, a few egoists can induce a large number of altruists to defect.
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