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Tuxedage comments on Prisoner's Dilemma on game show Golden Balls - Less Wrong
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To be a little technical, this is not actually prisoners dilemma, because they are allowed to communicate. The whole point of prisoners dilemma is that they cannot communicate, and thus, must choose to cooperate or defect based upon their knowledge of nash's equilibrium alone.
Although this is honestly quite an interesting solution to this kind of problem. I'll be using it the next time I'm offered a situation similar to this.
To be even more technical, "Prisoner's Dilemma" is actually used as a generic term in game theory. It refers to the set of two-player games with this kind of payoff matrix (see here). The classic prisoners dilemma also adds in the inability to communicate (as well as a bunch of backstory which isn't relevant to the math), but not all prisoners dilemmas need to follow that pattern.
In game theory terms, I'm not sure communication would do much for a one-off prisoner's dilemma.