Module V·Article III·~1 min read
Market Bubbles: The Psychology of Collective Madness
Psychology of Investors and Markets
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Anatomy of a Bubble
Robert Shiller described five characteristics of market bubbles:
- Sharp price increase
- Narratives explaining “why this time is different”
- Media frenzy
- Stories of rapid enrichment
- Growing participation of retail investors
Historical Examples
Tulip mania (1637): prices for tulip bulbs reached the value of a house. When the bubble burst — the market collapsed within a few weeks.
Dot-com (1997-2000): companies with no revenue were worth billions. Narrative: “The internet changes everything, old valuation metrics no longer apply.”
Subprime (2003-2007): “Home prices never fall on a national level” — a narrative that turned out to be false.
Crypto cycles (2017, 2021): a classic bubble pattern with rapid narratives (“Store of value”, “DeFi changes finance”).
Psychology of Bubble Participants
Most participants know it is a bubble — and continue to engage. A rational investor may buy overvalued assets hoping to sell before collapse. The problem: no one knows exactly when the bubble will burst.
Greater fool theory: “Even if I overpay, there will be an even greater fool who buys at a higher price.”
How to Protect Yourself
- Ignore narratives of “this time is different”
- Compare current valuations to historical norms
- Monitor credit leverage as an indicator of euphoria
- Diversify and maintain discipline in rebalancing
Practical Assignment
Investigate a current market or industry narrative that seems “hot” to you. (1) What narrative supports it? (2) What signs of a bubble are present? (3) What needs to happen for the narrative to prove false?
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