Forgotten Fortunes Editorial · Article Discussion
Read the original research: Black Monday and Portfolio Insurance: The 1987 Algorithmic Market Crash
Story overview: On October 19, 1987, the Dow Jones Industrial Average plunged 508 points (22.6%) in a single session. Automated portfolio insurance and index arbitrage collided with pre-existing investor anxiety, creating an illiquidity cascade across futures and cash markets that reshaped financial regulation.
Discussion question: At what point did a local problem become a wider financial threat?
Have a different interpretation? Share the evidence and explain why.
Editorial discussion starter, not an independent member endorsement.