This paper investigates methods for improving cooperation in the evolutionary Iterated Prisoner's Dilemma game (IPD): the tag-based approach [Riolo 1997] and the space-based approach [Oliphant 1994]. The two methods are similar in that both use a bias in selecting opponent to play the game; however, there is an important difference between the two. In Riolo [Riolo 1997]. this difference is considered as a "significant difference" of the space-based model from the tagbased model; he states "the tag space is not a scarce resource in the way spatial space usually is."
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