How to Spot a Bubble: Tulipmania to the S&P 500
Every bubble in 400 years has rhymed: cheap money, a new story, leverage, denial, collapse. The interesting question is not whether the S&P 500 is in one. It is what you do if it is.
The six-stage bubble pattern
| Stage | What you see | What you feel |
|---|---|---|
| 1. Displacement | A new technology, asset or policy | Curiosity, mild interest |
| 2. Boom | Early adopters make visible money | FOMO begins |
| 3. Euphoria | Cab drivers giving stock tips | Certainty, righteousness |
| 4. Leverage | Margin debt and IPOs surge | Greed dressed as conviction |
| 5. Distress | Insiders sell, narrative cracks | Uneasy denial |
| 6. Collapse | Forced selling, prices halve | Disbelief, then anger |
Pattern based on Kindleberger and Minsky. Tulipmania 1637, South Sea 1720, dot-com 2000, US housing 2008, crypto 2022 - all six stages present.
Key takeaways
Bubbles follow a six-stage pattern that has been near-identical from 17th-century tulips to dot-com tech and crypto.
Books like Devil Take the Hindmost, A Short History of Financial Euphoria and Manias, Panics and Crashes lay out the warning signs clearly. They are not subtle.
The S&P 500 in 2026 has several bubble fingerprints (high CAPE, narrow leadership, retail enthusiasm) but lacks the leverage profile of a classic mania.
You do not need to time the top. A boring global tracker, a value tilt, and a refusal to buy on margin gets you most of the protection most people need.