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Talk:Prisoner's dilemma

Former featured article Prisoner's dilemma is a former featured article. Please see the links under Article milestones below for its original nomination page (for older articles, check the nomination archive) and why it was removed.
Main Page trophy This article appeared on Wikipedia's Main Page as Today's featured article on March 16, 2004.
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Date Process Result
January 19, 2004 Refreshing brilliant prose Kept
April 16, 2008 Featured article review Demoted
Current status: Former featured article
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Something about bats...Edit

Example of payout in the behavioral exchange of vampire bats who engage in reciprocal feeding of non relatives [1]

C/C: "Reward: I get blood on my unlucky nights, which saves me from starving. I have to give blood on my lucky nights, which doesn't cost me too much."
D/C: "Temptation: You save my life on my poor night. But then I get the added benefit of not having to pay the slight cost of feeding you on my good night."
C/D: "Sucker's Payoff: I pay the cost of saving your life on my good night. But on my bad night you don't feed me and I run a real risk of starving to death."
D/D: "Punishment: I don't have to pay the slight costs of feeding you on my good nights. But I run a real risk of starving on my poor nights."

Dr. Duffy's comment on this articleEdit

Dr. Duffy has reviewed this Wikipedia page, and provided us with the following comments to improve its quality:


A rambling mess. No mention of dominance, Nash equilibrium or the uniqueness of the Nash equilibrium in the game form.

"A very narrow interpretation rationality" is a weak, subjective statement. Indeed rationality in the context of this game is not defined but simply involves each player playing a best response to the payoff incentives of the game.


We hope Wikipedians on this talk page can take advantage of these comments and improve the quality of the article accordingly.

Dr. Duffy has published scholarly research which seems to be relevant to this Wikipedia article:


  • Reference : John Duffy & Huan Xie, 2012. "Group Size and Cooperation among Strangers," Working Papers 12010, Concordia University, Department of Economics.

ExpertIdeasBot (talk) 16:56, 19 May 2016 (UTC)

Removed the vague mention of "restrictive interpretation of rationality" and moved the discussion of dominance and nash equilibrium up a section to be more prominent (though it was there in the General Form section), but I don't think it fits in the (already quite long) lede. Binkyuk (talk) 14:46, 16 December 2016 (UTC)

Dubious criticism of Hofstadter's briefcase gameEdit

After describing Hofstadter's briefcase version of PD, the article contains this sentence: "However, in this case both players cooperating and both players defecting actually give the same result, assuming no gains from trade exist, so chances of mutual cooperation, even in repeated games, are few." That seems like a strange way to interpret the case, and hardly a criticism of it. Wouldn't it be more reasonable to assume, since they're trading at all, that player A has a utility-function according to which diamonds & money > diamonds > money > nothing, and player B has a utility function according to which diamonds & money > money > diamonds > nothing? Does this criticism show up anywhere in a reliable source?50.191.21.222 (talk) 14:03, 27 November 2016 (UTC)

Text and image of payoff matrix are mismatchedEdit

Both the opening text and image use the values 0, 1, 2. But they use them to mean opposite things. In the text, the values are years in prison, i.e., bad things to be minimized. In the image, the values are payoffs, i.e., good things to presumably be maximized, though this is not mentioned in the caption. Also, in the text, the moves are betraying and staying silent, but in the image, the moves are cooperation and defection. The connection between these terms is not obvious or explained. The image is more standard, but the text is more intuitive. Not sure of the best way to make them agree. Honestrosewater (talk) 04:29, 23 December 2016 (UTC)

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  1. ^ Dawkins, Richard (2006). The selfish gene. Oxford university press. 
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