Transparency is critical to guarantee efficiency in most social systems. We expect or request people holding critical information to reveal it to the public to improve social welfare. Nevertheless, those people may, for their benefit, strategically postpone the disclosure of such information...

This paper considers a epistemic game-theoretic model of group identification which describes the evolving process of a collective action rule of the members in a social group. Group identity describes that the solutions to "who we are'' and "what we are'' questions among the members in a group....