JamesAndrix comments on The continued misuse of the Prisoner's Dilemma - Less Wrong
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As a group, they'd get more money appointing just one person to bid $0.01, and splitting it after the fact.
The rules of the game forbid that.
You mean as a group they would have gotten the exact same amount of money as they in fact did.
Maybe we should call this the "socialist fallacy" - confusing a group's total benefit with the "equality" of the outcome for the group's members.
No, I don't think that's what he means. There's an ambiguity in what is meant by "joint bid" in:
If seven people bid $0.01, does the prof take $0.01 for his $20, or does he take $0.07?
I noticed early on that the problem was ambiguous in this respect. Fortunately, for the point made, about the gains from cooperation and defection, it doesn't matter: all you need is that it's possible to share in larger gains by cooperating, unless someone defects, and the professor's reaction to what happened.