lecture 11 - ENT 104 Evolution of Cooperation and Sociality...

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Unformatted text preview: ENT 104 Evolution of Cooperation and Sociality Reciprocity Byproduct mutualism Kin-selected cooperation Reciprocity Trivers (1971) altruistic and cooperative behavior might evolve if individuals reciprocated cooperative acts. But, the greatest payoff goes to the recipient of a cooperative action who does not reciprocate The Prisoners Dilemma Implicate your partner in the robbery . You have chosen to defect . For this, Police will drop the charges against you, and you go free. Or you could remain silent , and cooperate with your partner. You get 2 years jail but your partner could not be convicted of the major crime. What Should You Do? Cooperate Defect You Cooperate 2 years 10 years Defect 0 years 8 years Your Partner Move Average years in prison Cooperate 9.2 Defect 7.2 Which move is best? 6418 cooperators were sentenced to a total of 59044 years in jail for an average payoff of 9.2 years each. 6186 defectors were sentenced a total of 44520 years in jail for an average payoff of 7.2 years each. Whats the dilemma? If it always pays to defect, why would anyone do anything else? What happens if you meet this partner multiple times? Tit-for-Tat (reciprocity) The TFT strategy: Cooperate on the first encounter After the first time, copy the partner's last move. Conditions: Niceness Swift retaliation Forgiveness Over the long run. Cooperate 4 Defect 6 2 Cooperate Defect 5 times: C : C = 4 C : C = 4 C : C = 4 C : C = 4 C : C = 4 Total: 20 5 times: C : C = 4 D : C = 6 D : D = 2 D : D = 2 D : D = 2 Total: 16 5 times: C : C = 4 D : C = 6...
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lecture 11 - ENT 104 Evolution of Cooperation and Sociality...

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