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. Author manuscript; available in PMC: 2008 Jul 14.
Published in final edited form as: J Theor Biol. 2007 Mar 24;247(3):574–580. doi: 10.1016/j.jtbi.2007.03.027

Fig. 2.

Fig. 2

Selected strategies in large populations when mutation rates are small. a) ALLD against TFT is a coordination game, where TFT is always selected as long as the benefit, b, is larger than the cost, c. b) If unconditional cooperators are added, they can invade and take over a TFT population by random drift, but an ALLC population is quickly taken over by ALLD players. ALLD is the selected strategy. c) If instead of TFT, WSLS competes with ALLC and ALLD, then WSLS is selected, provided the benefit-to-cost ratio, b/c, is sufficiently large. The critical value is 3 in the limit of weak selection. d) Similar behavior as in c) is observed if TFT is added, but the critical value is now lowered to 2 for any intensity of selection.