Interestingly, after the 1929 crash (October 28 and 29) the Dow’s movements over the following five days were: +12.3%, +5.8%, -5.8%, -9.9% and +2.6%). Subsequent to 1987’s Black Monday (October 19), the Dow’s changes were as follows: +5.9%, +10.2%, -3.8%, +0.02%, -8.0%. The stock market, of course, behaved quite differently during the years following these two crashes.