Tit for Tat is also ‘not envious’. To be envious, in Axelrod’s terminology, means to strive for more money than the other player, rather than for an absolutely large quantity of the banker’s money. To be non-envious means to be quite happy if the other player wins just as much money as you do, so long as you both thereby win more from the banker. Tit for Tat never actually ‘wins’ a game. Think about it and you’ll see that it cannot score more than its ‘opponent’ in any particular game because it never defects except in retaliation. The most it can do is draw with its opponent. But it tends to
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