Pitfalls in Testing For Explosive Bubbles in Asset Prices

Publication Date
Financial Markets Group Discussion Papers DP 65
Publication Authors

Rational bubbles in stock prices are not reliably detectable through the use of standard tests to determine whether stock prices are "more explosive" than dividends or whether stock prices and dividends are cointegrated. This is because periodically collapsing bubbles appear to be stationary on the basis of these tests, even though they have explosive conditional means. 

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