Iterated Prisoner\u27s Dilemma with Choice and Refusal of Partners

. This paper investigates cooperative behavior in an artificial ecology.in which egoistic agents interact-with each other through a tournament of iterated games..The tournament played is a variant of the Axelrod (1984) iterated prisoner\u27s dilemma (IPD) game,modified to permit players to choose and refuse potential game.partners. In each iteration, players use expected payoffs updated on\u27the basis of past encounters to make prisoner\u27s dilemma game offers to a limited number of preferred players, and to refuse prisoner\u27s, dilemma game offers from unacceptable players..