@inbook{NBERc11245,
 Crossref = "NBERbern99-1",
 title = "Why is the U.S. Unemployment Rate So Much Lower?",
 author = "Robert Shimer",
 BookTitle = "NBER Macroeconomics Annual 1998, volume 13",
 Publisher = "MIT Press",
 pages = "11-74",
 year = "1999",
 month = "January",
 URL = "http://www.nber.org/chapters/c11245",
}
@book{NBERbern99-1,
 title = "NBER Macroeconomics Annual 1998, volume 13",
 author = "Ben S. Bernanke and Julio Rotemberg",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "1999",
 URL = "http://www.nber.org/books/bern99-1",
}