On October 19, 1987, the Dow Jones fell 22% in a single session — still the largest one-day percentage drop in its history. Program trading and portfolio insurance strategies amplified the selling into a self-reinforcing spiral.
On October 19, 1987, the Dow Jones fell 22% in a single session — still the largest one-day percentage drop in its history. Program trading and portfolio insurance strategies amplified the selling into a self-reinforcing spiral.