A stock market boom can be described as a bubble if there is
high probability of a
large scale fall in share prices.
Stock market crash is not triggered
- by fundamental news or
- by a certain level of share overvaluation.
Instead, it happens because of
- a drastic change in the behavior of market players.
This is why the necessary and sufficient conditions for the bursting of a given asset price bubble, applicable in practice, cannot be provided with the tools of mathematical economics.
A market crash will ensue with a high likelihood
if noise trading becomes dominant, the signals of which are to be found in the following stochastic factors:
• Increasing effect of leverage.
• Increasing activity on part of the economic policy.
• Increasing number of corporate scandals, fraud and corruption.
• Fundamentally unjustifiable co-movement of share prices.
http://myinvestingnotes.blogspot.com/2009/11/how-to-distinguish-stock-market-bubbles.html
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