What day of the week will be the next =10% change in the S&P 500?

Question

i.e. if it ended on say, tuesday at 1000.  And then at end of day weds it is 1100 or higher, or 900 or lower, then the answer is WEDNESDAY.

We take (end of prior day) => (end of day in question) as the change, so that we treat "overnight changes" as being part of the subsequent day.

Manifold Markets · Answer

Per Manifold Markets prediction market, Monday, followed by Friday and Wednesday are most likely. See the market for live updates (6 traders, as of Mar 23, 2026).

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