Figure 1 | Scientific Reports

Figure 1

From: Defection and extortion as unexpected catalysts of unconditional cooperation in structured populations

Figure 1

Imitation on a square lattice fails to sustain cooperation and extortion.

Depicted are the stationary frequencies of surviving strategies in dependence on the strength of the social dilemma b. It can be observed that for sufficiently small values of b only WSLS survive. As b increases, the pure WSLS phase first gives way to a narrow two-strategy WSLS + D phase, which then transforms into the three-strategy WSLS + TFT + D phase. The emergence of these three different phases is a direct consequence of dominance relations between the three involved strategies, which are schematically depicted in the bottom frame for the respective values of b from left to right. Arrows show the direction of invasion between strategies.

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