Allowing periodic opportunities for renegotiation lets players escape the grim trigger trap, but it does not improve outcomes overall because it creates new incentives to defect and then gamble on talking one's way out of the punishment.
Source quote, verbatim
Or if you allow periodic opportunities for renegotiation, then you might be able to get out of a grim trigger trap. This sounds like it would improve outcomes, but in fact it gives new opportunities for defecting/cheating.
From
Craig Calcaterra, Wulf A. Kaal, A Technical Perspective on Decentralization (2021), Infinite variations of Prisoner’s Dilemma, p. 13 https://ssrn.com/abstract=3782203 · source PDF
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Craig Calcaterra, Wulf A. Kaal, A Technical Perspective on Decentralization (2021). SSRN: https://ssrn.com/abstract=3782203
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