Kyung Il Yang Chief Editor, Gomdolee stephen@gomdolee.com March 31, 2026  1. Introduction The October 1987 Black Monday crash stands as one of the most dramatic events in financial history. On October 19, 1987, the S&P 500 fell approximately 20.4% in a single trading session, part of a broader peak-to-trough decline of roughly 33.5% from its … Continue reading The 1987 Crash as the Fractal DNA of Modern Stock Market Crashes (REVISED)