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    Cultural Group Selection Plays an Essential Role in Explaining Human Cooperation: A Sketch of the Evidence.Peter Richerson, Ryan Baldini, Adrian Bell, Kathryn Demps, Karl Frost, Vicken Hillis, Sarah Mathew, Emily Newton, Nicole Narr, Lesley Newson, Cody Ross, Paul Smaldino, Timothy Waring & Matthew Zefferman - 2016 - Behavioral and Brain Sciences 39:1-71.
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    The Punishment That Sustains Cooperation is Often Coordinated and Costly.Samuel Bowles, Robert Boyd, Sarah Mathew & Peter J. Richerson - 2012 - Behavioral and Brain Sciences 35 (1):20 - 21.
    Experiments are not models of cooperation; instead, they demonstrate the presence of the ethical and other-regarding predispositions that often motivate cooperation and the punishment of free-riders. Experimental behavior predicts subjects' cooperation in the field. Ethnographic studies in small-scale societies without formal coercive institutions demonstrate that disciplining defectors is both essential to cooperation and often costly to the punisher.
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    Explaining Group-Level Traits Requires Distinguishing Process From Product.Karthik Panchanathan, Sarah Mathew & Charles Perreault - 2014 - Behavioral and Brain Sciences 37 (3):269-270.
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