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https://punkonomics.org/2013/07/24/prisoners-are-less-selfish-than-students-they-finally-tested-the-prisoners-dilemma-on-actual-prisoners-and-the-results-were-not-what-you-would-expect-business-insider-australia/
Prisoners are less selfish than students: "They Finally Tested The 'Prisoner's Dilemma' On Actual Prisoners — And The Results Were Not What You Would Expect" (Business Insider Australia)