We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleThe evolution of norms.AuthorsEhrlich, Paul R; Levin, Simon APublicationPLoS biology, 2005, Vol 3, Issue 6, pe194ISSN1545-7885Publication typeJournal ArticleDOI10.1371/journal.pbio.0030194