The three most important highs in recent history, corresponding to the crashes of 2000, 2007 and 2020, are in the ratio known as the Golden Section (0.618).
The time interval between the 2000 and 2007 highs was on average 2791 days: the 2000 Dow highs were on January 14, the S&P500 highs were on March 24, while the 2007 highs in both indices were on October 11,...
