@inbook{NBERc11397,
 Crossref = "NBERfrie82-1",
 title = "Debt and Economic Activity in the United States",
 author = "Benjamin M. Friedman",
 BookTitle = "The Changing Roles of Debt and Equity in Financing U.S. Capital Formation",
 Publisher = "University of Chicago Press",
 pages = "91-110",
 year = "1982",
 URL = "http://www.nber.org/chapters/c11397",
}
@book{NBERfrie82-1,
 title = "The Changing Roles of Debt and Equity in Financing U.S. Capital Formation",
 author = "Benjamin M. Friedman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1982",
 URL = "http://www.nber.org/books/frie82-1",
}