@techreport{NBERw12913,
 title = "Overruling and the Instability of Law",
 author = "Nicola Gennaioli and Andrei Shleifer",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12913",
 year = "2007",
 month = "February",
 URL = "http://www.nber.org/papers/w12913",
}