Abstract
It is no doubt that forming the coalition among many agents is necessary to resolve the environmental problems. To encourage the formation of coalition, coalition formation mechanism should be studied. In many environmental problems, the interaction between state of the environment and the coalition behavior by agents is critical nature. However, this nature is not described in previous works. In this paper, the model to describe the coalition formation with such an interaction is developed by use of stochastic game. Then how the payoff structure affects the coalition formation is studied
