Punishment sustains large-scale cooperation in prestate warfare

Coordinated Punishment of Defectors Sustains Cooperation and Can Proliferate When Rare

(2010) R. Boyd et al.   SCIENCE

Indirect reciprocity provides only a narrow margin of efficiency for costly punishment

(2009) Hisashi Ohtsuki et al.   NATURE

Culture and the evolution of human cooperation

(2009) R. Boyd et al.   PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Cooperative breeding in South American hunter-gatherers

(2009) K. Hill et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Positive Interactions Promote Public Cooperation

(2009) D. G. Rand et al.   SCIENCE

Did Warfare Among Ancestral Hunter-Gatherers Affect the Evolution of Human Social Behaviors?

(2009) S. Bowles   SCIENCE

Winners don’t punish

(2008) Anna Dreber et al.   NATURE