We have written several papers that provide further details on Internet technology, costs, and pricing problems (see, e.g., [MacKie-Mason and Varian1995b], [MacKie-Mason and Varian1995a], [MacKie-Mason and Varian1995c], and [MacKie-Mason and VarianTo appear]). We maintain two large, comprehensive WWW servers containing links to related information. A comprehensive catalog of electronic materials concerning the economics of the Internet can be found at the Economics of the Internet site. A comprehensive directory of information available on the Internet concerning telecommunications more broadly is available at the University of MichiganSchool of Public Policy telecommunications site.