Analysis of the Multi-Phases Equilibrium on NIPD

To deal with the traditional problem of N-player iterated prisoner´s dilemma (NIPD), this paper proposes a classify-coding scheme of individual strategy, related to the thoughts of people in reality. The simulation experiments indicate that the NIPD model based on the new strategy features a dynamic, successive multi-phases equilibrium. A quantitative analysis on multi-phases equilibrium is made, and a calculation method on the cooperation rate of the final equilibrium has been put forward. And this paper also elaborates causes of evolutionary equilibrium, which provides a new idea on studying NIPD.