Game Theoretical Foundation of Collusion : Factors other than self-interests and role of private information

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I investigated the possibility of collusion and competition by using the approaches of mechanism design and repeated games. I took into account explicitly the fact that real individuals do not necessarily behave for their own material interests, the fact that they are influenced by information about factors irrelevant to their material interests, and the fact that they use private information and are limited to access public information. The most important contributions are the paper entitled "Repeated Games with Private monitoring : Two Players," which was published in Econometrica as a regular article and the paper entitled "Mechanism Design with Side Payments : Individual Rationality and Iterative Dominance", which was accepted in Journal of Economic Theory as a regular article. Both journals are top among the economics theory journals. Other papers such as "Role of Honesty in Implementation" is related to the issue of the problem of factors other than the material interests. The papers entitled "Detail-Free Mechanism design and Rationality", which was published in Japanese Economic Review, was written as the lecture article for the Nakahana Awards of the Japanese economic association.