Authors:

Competing is intense among humans, and within a group, selfish individuals always win. But in contests between groups, groups of altruists always beat groups of selfish individuals.

"Altruistic groups, selfish people win". Interview with Zinta Lundborg, www.postandcourier.com. May 5, 2012.
Competing is intense among humans, and within a group, selfish individuals always win. But in contests between groups, groups of altruists always beat groups of selfish individuals.