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ch player's strategy is given by a pair (a, a The first component I. Alexander R (1987) The &obey of Moral sntems (Aldine de Cayter, New Toth). 2. Rand DG, Nowak MA (2012) Human cooperation. Trends Cogn Ski 117:413-425. 3. Malls AP, Semmann D (2010) How Is human cooperation different? PAWS Trans A Soc

lic information (18, 32, 33), our results confirm that this strategy is too strict and unforgiving when information is private and noisy (34-36). Evolutionary Dynamics. Next we explore how likely a leading-eight strategy would evolve when population members can change their strategies over time. We first consider

ial pressure in charitable ghing. 0 ) (con 127(01-56. 24. Cain DM. Dane J. Newman GE 0014) Giving versus giving in. Aced84,W Ann (Mk 505-533. 25. Rand DG, Greene JO, Novak MA (2012) Spontaneous giving and calculated greed. Name 4890416)427-m 26. Nielsen UN. Titan JR. Wengstrarn E 0014) Second thought

operate without looking: Why we care what people think and not just what they do Moshe Hoffman', Erez Yoeli', and Martin A. Nowak' I' •Peogram for Evolutionary Dynamics, Oeparunent of Mathematics and 'Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138 Edited by Michael S. Gan