The Investment Scientist

This is an article I wrote fourteen years ago that was inspired by Daniel Kahneman’s Nobel Lecture “Maps of Bounded Rationality.” Here I will repost it without changing one word – I am proud of the evergreen nature of my articles. At the end, I will make a few additional comments in red that include new insights from the last fourteen years. 

Do you know that the top three one-day drops in Dow Jones happened in October? On the 19th of October 1987, Dow Jones fell nearly 23%, making the day the worst day in the US stock market history. It was followed by the 24th and 29th of October 1929, when Dow Jones fell 13.5% and 11.5% respectively, ushering in the Great Depression. These events are commonly remembered as the crash of 29 and the crash of 87.