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What is Greater Fool Theory?

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Greater fool theory is a hypothesis that explains the occurrence of speculative bubbles that inflate the price of assets such as stocks, real estate and commodities far beyond their intrinsic value.
The idea is that people may realize that prices no longer reflect a realistic assessment of value but don't care because prices continue to rise as newcomers enter the market attracted by recent returns.
Asset bubbles tend to attract media attention that draws new investors. Investors may be conservative at first but after experiencing positive returns they tend to get more aggressive. The result is that a market that goes up can draw a great deal more investment as word spreads. This can keep prices rising far beyond intrinsic value.
In this scenario, the speculative bubble may not crash until the supply of new investment, or "fools", dries up. The investors left holding the assets when they crash typically experience large losses, particularly those who bought towards the end.
Overview: Greater Fool Theory
The theory that market participants may trade assets that they know are overvalued because prices keep going up as new money enters the market chasing recent returns.
Explains apparently irrational market prices.
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