. Author manuscript; available in PMC: 2017 May 22.
Published in final edited form as: Sociol Sci. 2015 Feb 18;2:50–81. doi: 10.15195/v2.a5
This open-access article has been published under a Creative Commons Attribution License, which allows unrestricted use, distribution and reproduction, in any form, as long as the original author and source have been credited