@techreport{NBERw13309,
 title = "Social Identity and Preferences",
 author = "Daniel J. Benjamin and James J. Choi and A. Joshua Strickland",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13309",
 year = "2007",
 month = "August",
 URL = "http://www.nber.org/papers/w13309",
}