GETTING RECOMMENDATION IS NOT ALWAYS BETTER IN ITERATED PRISONER’S DILEMMA

Abstract

We present an extended version of the Iterated Prisoner’s Dilemma game in which agents with limited memory receive recommendations about the unknown opponents to decide whether to play with. Since agents can receive more than one recommendation about the same opponent, they have to evaluate the recommendations according to their disposition such as optimist, pessimist, or realist. They keep their first hand experience in their memory. Since agents have limited memory, they have to use different forgetting strategies. Our results show that getting recommendations does not always perform better. With the support of recommendation, cooperators can beat defectors. We observe that realist performs the best and optimist the worse.