Group formation is important in many economic contexts. The current literature on group formation assumes that individuals may join any existing group. In this paper, I consider the implications of social, geographic, and informational constraints to group membership decisions. I embed the...

Abstract. In recent years, there has been increased interest among funding organizations and administrators in supporting the acquisition of interdisciplinary skills in collaborative communities, such as universities, national labs, and knowledge-based firms. However, there has been relatively...