5Bikhchandani, S., Hirshleifer, D., Welch, I.. Learning from the Behavior of Others: Conformity, Fads, and Informational Cascades[J] . Journal of Economic Perspectives, American Economic Association, 1998, vol. 12 (3), pages 151 - 70.
6Glenn W.. Harrison & John A. List. Field Experiments [J] . Journal of Economic Literature, American Economic Association, 2004, vol. 42 (4), pages 1009 - 1055.
7Bernheim, B Douglas. A Theory of Conformity [ J ]. Jour nal of Political Economy, University of Chicago Press, 1994 , vol. 102(5),pages 841 -77.
8Cai H. B., Chen Y. Y., Fang H. M. Observational Learning: Evidence from a Randomized Natural Field Experiment [J] . The American Economic Review, Vol. 99, No. 3. , pp. 864 - 882.
9Golder S A, Huberman B A. Usage Patterns of Collaborative Tagging Systems [J] . Journal of Information Science, 2006,32(2): 198 - 208.
10Cattuto, C. , V. Loreto, and L. Pietronero, Semiotic dynamics and collaborative tagging. Proceedings of the National, Academy of Sciences (PNAS), 2007. 104(5): p. 1461- 1464.