Weitzman, Martin2010-03-031965Weitzman, Martin L. 1965. Utility analysis and group behavior: An empirical study. Journal of Political Economy 73(1): 18-26.0022-3808http://nrs.harvard.edu/urn-3:HUL.InstRepos:3710799en-USUtility Analysis and Group Behavior: An Empirical StudyJournal Article2010-03-0310.1086/258989