4Banerjee,Abhijit V. Asimple Model of Herd Behavior [ J ] . Quarterly Journal of Economics. August 1992, (8) :797 - 817.
5Bikhchandani, sushil; Hishleifer, David and Welch,Ivo. A Theory of fads, Fashion, Custom, and Culture Change as Information Cascades[ J ]. Journal of Political Economy, 1992, (10): 992 - 1026.