@techreport{NBERw8813,
 title = "Abortion as Insurance",
 author = "Phillip B. Levine and Douglas Staiger",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "8813",
 year = "2002",
 month = "February",
 URL = "http://www.nber.org/papers/w8813",
}