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| 1. | Pew Internet & American Life Project Survey, November-December 2000; May-June 2000; July-August 2000. |
| 2. | Trout, Jack. Differentiate or Die, New York: John Wiley & Sons, 2000. |
| 3. | Bradlow, Eric T. and David C. Schmittlein, "The Little Engines That Could: Modeling the Performance of World Wide Web Search Engines," Marketing Science, Vol. 19 No. 1 (Winter 2000), pp. 43-62. |
| 4. | Discussed by Steve Andriole at the Wharton Fellows in e-Business program, Philadelphia, May 11, 2001. |
| 5. | Roderick, Daffyd, "File it Under Sharing," Time, June 4, 2001, p. 58. |
| 6. | Lotozo, Eils, "Love at First Byte: Personal-Ad Web Sites Booming," The Philadelphia Inquirer, April 20, 2001, p. A-1. |
| 7. | More powerful preference models are being developed that make more accurate recommendations than collaborative filtering. See, for example, Ansari, Asim, Skander Essegaier and Rajeev Kohli, " Internet Recommendation Systems," Journal of Marketing Research, Vol. 37 (August 2000), pp. 363-375. |
| 8. | Chircu, Alina M. and Robert J. Kauffman, "Show Me The Money: Comparing the Business Value of Traditional and Electronic B2B Procurement Systems," working paper, Carlson School of Management, University of Minnesota, 2000. |
| 9. | Hoch, Stephen J., "Combining Models with Intuition," Wharton on Making Decisions, Stephen J. Hoch and Howard C. Kunreuther, eds., New York: John Wiley & Sons, 2001, pp. 81-101. |
| 10. | Urban, Glen L., Fareena Sultan, and William Qualls, "Design and Evaluation of a Trust Based Advisor on the Internet," Working Paper, July 19, 1999, MIT, http://ebusiness.mit.edu. |
| 11. | Shriver, Jerry, "Las Vegas Diners Mull Wine Selection Digitally," USA Today, June 29, 2001. |
| 12. | Pugh, Tony, "Online Medical Advice is Incomplete, Study Says," Austin American-Statesman, May 23, 2001. |
| 13. | Wingfield, Nick and Matthew Rose, "Amazon Plans to Charge Publishers Fee for Online Recommendations," The Wall Street Journal, February 7, 2001, p. B-1. |