Prof. YEUNG Wing Kay, DavidDavidProf. YEUNG Wing Kay2021-02-262021-02-262006International Game Theory Review, 2006, vol. 8(4), pp. 739-744.0219-1989http://hdl.handle.net/20.500.11861/6441Under dynamic cooperation a player may use 'irrational' acts to extort additional gains if later circumstances allow. In this article we present a condition under which even if irrational behaviors appear later in the game the concerned player would still be performing better under the cooperative scheme.enPeer Reviewed Journal Article10.1142/S0219198906001223