d(1) = d. The two key differences in payoff are then a(n) - c(n)- am a ao Go — a2 + 4 — a) a ao (15) (19) (20) (21) (22) EFTA00810746 J. Waketey and M. Nowak/Theoretical Population Biology 125 (2019)38-55 43 — _ (krc__ c(I — b) be —do ° do — bc b(n)— d(n)= (bon + aiot bt c) bc — a