@inbook{NBERc12314,
 Crossref = "NBERbore01-1",
 title = "Free Riding and Sales Strategies for the Internet",
 author = "Dennis W. Carlton and Judith A. Chevalier",
 BookTitle = "E-commerce",
 Publisher = "Journal of Industrial Economics, Vol. 49, no. 4, (John Wiley & Sons, Inc.)",
 pages = "441-461",
 year = "2001",
 month = "December",
 URL = "http://www.nber.org/chapters/c12314",
}
@book{NBERbore01-1,
 title = "E-commerce",
 author = "Severin Borenstein and Garth Saloner",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Journal of Industrial Economics, Vol. 49, no. 4, (John Wiley & Sons, Inc.)",
 year = "2001",
 URL = "http://www.nber.org/books/bore01-1",
}