Abstract
Concerning the problem that cooperation in N-player Iterated Prisoner's Dilemma (NIPD) is hard to emerge when N is great, this paper researched the status of game both in the free competition mode and in the agreement competition mode. And imitating the strategy "Tit for Tat" in 2-IPD, it promoted the strategy "Simulated TFT". And combining the theories of co-evolution, it built up a double-layer evolutionary model, DL-NIPD, in which players and their aggregations, groups, can evolve in their own-layer respectively. Analysis of the numerical experiment results indicates that, under the free competition case, cooperation is usually easier to emerge in a small group of player than in a larger one, while depending on the straight-agreement and competition of groups, DL-NIPD can get a high rate of cooperation under any N.
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