S&P 500 · Log YoY — Fourteen Crossings of Zero
Bull/bear regimes — A century sliced into fourteen bull and bear regimes via log YoY.
On a log year-over-year scale, positive is bull and negative is bear. Fourteen zero-line crossings since 1928 — each one a handoff between cycles.
What this page answers
This static page is built to answer searches for S&P 500 · Log YoY. It summarizes the live dataset behind the Fourteen Crossings of Zero panel and links to the full interactive chart.
On a log year-over-year scale, positive is bull and negative is bear. Fourteen zero-line crossings since 1928 — each one a handoff between cycles. The data is refreshed by the History of Market pipeline and published as a stable JSON endpoint for research, citation, and AI-agent use.
The plate
Latest Snapshot
- Updated
- 2026-09-04
- Latest close
- 7,747.712026-09-03
- Observations
- 24,786
- Sample
- 1927-12-30 – 2026-09-03
Data & Source
GET /api/sp500/price.json — Canonical dataset endpoint.
Exchange closing prices · Company filings · Robert Shiller · FRED · NBER.
FAQ
Where does this data come from?
History of Market combines public market and macro datasets — exchange closing prices, company filings, Robert Shiller, FRED, NBER, and the UBS Global Investment Returns Yearbook (Dimson–Marsh–Staunton). 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.