Simulation Study on the Social Dilemma Model with the Exit Option

Abstract

This paper describes the results of the social dilemma simulation game where players can change parties to interact with and assess the effectiveness of the Exit-TFT strategy, whose existence has been confirmed in experiments with university students. We conducted simulations in which Exit-TFT, Fixed-TFT, Move-AllD, and Fixed-AllD competed, tested whether the cooperative strategies could weed out the non-cooperative strategies depending on initial distribution of strategies, and drew a phase diagram. The results indicated: 1) there were areas in which cooperative strategies won the competition against non-cooperative strategies, and 2) dominance relationships circulated among the four strategies near bifurcation points.