S&P 500 · Multiplicative Contribution by Extreme Days — Do Not Add Returns, Ask What Each Group Multiplies
極端な取引日 — ベストの数十日を逃す（またはワーストを避ける）と口座は何倍違うか。
[Ex-post accounting, not timing advice] The five groups multiply, not add: best 50 days ×13.37, middle ≈6,500 days ×1.80, worst 30 days ×0.15, and $1 ends at $5.10.
What this page answers
This static page is built to answer searches for S&P 500 · Multiplicative Contribution by Extreme Days. It summarizes the live dataset behind the Do Not Add Returns, Ask What Each Group Multiplies panel and links to the full interactive chart.
[Ex-post accounting, not timing advice] The five groups multiply, not add: best 50 days ×13.37, middle ≈6,500 days ×1.80, worst 30 days ×0.15, and $1 ends at $5.10. The data is refreshed by the History of Market pipeline and published as a stable JSON endpoint for research, citation, and AI-agent use.
Latest Snapshot
- Updated
- 2026-07-17
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Data & Source
GET /api/sp500/daily-extremes.json — Canonical dataset endpoint.
Yahoo Finance · Macrotrends · Robert Shiller · FRED · S&P Global · Nasdaq · NBER.
FAQ
Where does this data come from?
History of Market combines public market and macro datasets including Yahoo Finance, Macrotrends, Robert Shiller, FRED, S&P Global, Nasdaq, and NBER. The exact endpoint for this panel is linked below.
How often is it updated?
Daily-tier datasets refresh after the U.S. market close, with a broader weekly refresh on Sunday. The timestamp shown on this page comes from the JSON payload.
Can I use the data?
Yes, for research and education with attribution to History of Market. Upstream data sources retain their own terms.