Adjusted Tit-for-Tat sustains cooperation across any matching rule. [fact]
For 6 near enough to one - specifically if 6 2 Max[p/(l + p), (a - 1)/(1 + @)I (2) - the Adjusted Tit-for-Tat strategies are a subgame perfect equilibrium in the community trading game for any matching rule M.
PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE O…, loc. 57