Resolves YES upon an accepted update to the following table on Wikipedia https://en.wikipedia.org/wiki/List_of_largest_daily_changes_in_the_S%26P_500_Index#Largest_percentage_changes with a drop of more than 8%. If no such update is made, resolves NO.

If Wikipedia becomes unreliable during this time (i.e. the article is abandoned, removed, or Wikipedia's reliability as a source comes into serious question), I will resolve this using my own assessment. I do not expect this to happen, and if it does, I do not expect my resolution to be controversial.

According to the aforementioned Wikipedia table, this would have resolved YES for only 7 years in history, i.e. 1929, 1932, 1933, 1937, 1987, 2008, and 2020.

Since I believe that the resolution of this market will be very objective, I may participate in it.