@techreport{NBERw13874, title = "Collateral Pricing", author = "Efraim Benmelech and Nittai K. Bergman", institution = "National Bureau of Economic Research", type = "Working Paper", series = "Working Paper Series", number = "13874", year = "2008", month = "March", URL = "http://www.nber.org/papers/w13874", }