@inbook{NBERc7985,
 Crossref = "NBERglae08-1",
 title = "Did the Death of Distance Hurt Detroit and Help New York?",
 author = "Edward L. Glaeser and Giacomo A. M. Ponzetto",
 year = "2007",
 month = "December",
 URL = "http://www.nber.org/chapters/c7985",
}