What accounts for TIT FOR TAT's robust success is its combination of being '''nice''', '''retaliatory''', '''forgiving''', and '''clear'''. Its '''niceness''' prevents it from getting into unnecessary trouble. Its '''retaliation''' discurages the other side from persisting whenever defection is tried. Its '''forgiveness''' helps restore mutual cooperation. And its '''clarity''' makes it intelligible to the other player, thereby eliciting long-term cooperation.
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What accounts for TIT FOR TAT's '''robust success''' is its combination of being '''nice''', '''retaliatory''', '''forgiving''', and '''clear'''. Its '''niceness''' prevents it from getting into unnecessary trouble. Its '''retaliation''' discurages the other side from persisting whenever defection is tried. Its '''forgiveness''' helps restore mutual cooperation. And its '''clarity''' makes it intelligible to the other player, thereby eliciting long-term cooperation.