We would like to thank Michael Smith, Scott Schaefer, and participants at the Yale applied micro lunch for helpful comments. We benefited greatly from expert research assistance by Chip Hunter, Patrik Gaggenberger, and Tina Lam. We thank Madeline Schnapp for assistance and rely heavily on her 6/21/2001 presentation at the UCB/SIMS Web Mining workshop for data. Goolsbee would like to thank the National Science Foundation (SES 9984567), the Sloan Foundation and the American Bar Foundation for financial support. We have no reason to thank the University of Chicago Press. The views expressed herein are those of the authors and not necessarily those of the National Bureau of Economic Research
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