@techreport{NBERr0121,
 title = "On the Impossibility of Informationally Efficient Markets",
 author = "Sanford J. Grossman and Joseph E. Stiglitz",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Reprint Series",
 number = "121",
 year = "1980",
 month = "December",
 URL = "http://www.nber.org/papers/r0121",
 abstract = {},
}