Which strategy has been shown to be the most effective strategy to promote cooperation?

Question

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The tit-for-tat strategy has been shown to be the most effective strategy to promote cooperation. This strategy involves initially cooperating with another person and then mirroring their behavior in subsequent interactions. It promotes cooperation by rewarding cooperative behavior and punishing non-cooperative behavior, thereby encouraging the other person to cooperate as well.

Which Strategy Has Been Shown to Be the Most Effective