The nonlinearity of 19 October 1987 was decidedly different than 13 December 2024. 19 October 1987 was a part of a 5/10 quarter :: x/2x first and second fractal collapse, but was near the beginning of a sizable duration 1982 to 2025 13/32 year :: x/2.5x fractal series under the umbrella of cascadingly falling US central bank fed funds’ interest rates and a massive central bank QE bail-out for a fraudulent 2007 bubble and an historical extreme bail-out for the Covid pandemic.

Compared to the nonlinear event of 19 October 1987, 13 December 2024 is near the end of the 1982 to 2025 series and occurs only 5 trading days after the ACWI 9 Dec 2024 fibonacci 123.58 peak valuation which represented the 27 Oct 2023 third fractal high in a 27 Oct 2023 55/139/89 day series :: x/2.5x/1.618x.

Time will very soon tell, if this model is correct.