Key points are not available for this paper at this time.
Robert J. Shiller, Fumiko Kon-Ya, Yoshiro Tsutsui, Why Did the Nikkei Crash? Expanding the Scope of Expectations Data Collection, The Review of Economics and Statistics, Vol. 78, No. 1 (Feb., 1996), pp. 156-164
Shiller et al. (Thu,) studied this question.