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Bubbles & crashes: a short history
Markets don't repeat, but they rhyme. Every bubble runs the same three acts, mania, denial, capitulation, and every crash exposes the same fault line: too much borrowed money chasing a story that suspended the normal rules of valuation. Here are the two that shaped the modern market, and how today rhymes with both.
The dot-com bubble (1995–2000)
The internet was a genuine revolution, and that's exactly why the bubble grew so large. Capital poured into anything with a ".com", valued on "eyeballs" and page views rather than earnings. Profitless companies IPO'd and doubled on day one; the Nasdaq roughly quintupled in five years.
- The tell: valuation metrics were abandoned. "This time is different" justified paying any price for growth that hadn't arrived.
- The unwind: from its 2000 peak the Nasdaq fell about 78% over the next two years. Household names (Pets.com) went to zero.
- The twist: the technology was real. Amazon fell ~90%, and then became one of the great companies of the era. Being right about the trend and wrong about the price can still ruin you.
The 2008 financial crisis
A housing bubble met financial engineering and leverage. Cheap credit fuelled a run-up in U.S. home prices; mortgages, including risky subprime loans, were bundled into securities (MBS) and re-bundled into CDOs, stamped with top ratings that didn't reflect the underlying risk. Banks held these with enormous leverage.
- The tell: risk was hidden and dispersed until nobody knew who held the losses. Complexity masked fragility.
- The trigger: as house prices fell and subprime borrowers defaulted, the securities collapsed. Lehman Brothers failed in September 2008; credit froze worldwide.
- The fallout: a global recession, bank bailouts, and a decade of near-zero interest rates that shaped every market since.
Further reading: 2008 financial crisis (Wikipedia).
The pattern underneath both
Strip away the specifics and the machine is identical:
- Cheap money lowers the cost of risk and pushes capital toward speculation.
- Leverage amplifies the up-move, and later the down-move.
- A story ("the internet changes everything", "house prices never fall") suspends normal valuation.
- A trigger, rising rates, a default, a failed refinancing, starts forced selling.
- Deleveraging feeds on itself: selling begets selling until the leverage is wrung out.
How today rhymes
The current debate is AI. The optimists are right that it's transformative; the skeptics are right that some of the financing looks familiar. Watch the same fault lines: concentration (a handful of names carrying whole indices), leverage (record margin debt), and circular financing, capital cycling between chipmakers, their customers and the funds backing both, with debt raised to buy hardware that depreciates faster than the loans against it. None of that dates the top; bubbles can run for years. It just means the fragility is real, not imagined. We break the AI case down in detail on The AI Bubble.
Educational market information, not financial advice. Historical figures are approximate and for context. Markets carry risk of loss, do your own research.