Abstract
A methodology is shown to analyze phases of player's coalition formation. It can be used for analyzing inter-regional cooperation which is a relevant problem in Japan. Network formation game is used to model the problem with some extentions on concepts of coalition and coalition formative condition. The coalition among more than 3 players is introduced, which is not considered in the standard network formation game. The coalition formative condition is also introduced taking into account specific characteristics about in frastructure construction. The methodology is applied to oil allocation problem among Caspian coastal countries, and how the methodology works in the real problem is examined.
