@inbook{NBERc8332,
 Crossref = "NBERgreg94-1",
 title = "What Determines the Sacrifice Ratio?",
 author = "Laurence Ball",
 BookTitle = "Monetary Policy",
 Publisher = "The University of Chicago Press",
 pages = "155-193",
 year = "1994",
 month = "January",
 URL = "http://www.nber.org/chapters/c8332",
}
@book{NBERgreg94-1,
 title = "Monetary Policy",
 author = "N. Gregory Mankiw",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "The University of Chicago Press",
 year = "1994",
 URL = "http://www.nber.org/books/greg94-1",
}