@techreport{NBERw12758,
 title = "Is Drug Coverage a Free Lunch? Cross-Price Elasticities and the Design of Prescription Drug Benefits",
 author = "Martin Gaynor and Jian Li and William B. Vogt",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12758",
 year = "2006",
 month = "December",
 URL = "http://www.nber.org/papers/w12758",
}