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Published online by Cambridge University Press: 13 April 2010
Lawrence H. Davis (1977, 1985) has formulated and defended a version of the argument from symmetry for the non-iterated Prisoner's Dilemma that attempts to show that under certain conditions the rationally prescribed course of action in this game is co-operation. The argument runs as follows below. (I have prefixed a ‘D’ to each of Davis's numbers here, and in subsequent references, in order to avoid confusion as I refer to his points.)