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Fads or Bubbles?

  • Simon van Norden

    (Bank of Canada)

  • Huntley Schaller

    (Carleton University)

  • )

This paper tests between fads and bubbles using a new empirical strategy (based on switching regression econometrics) for distinguishing between competing asset pricing models. By extending the Blanchard and Watson (1982) model, we show how stochastic bubbles can lead to regime switching in stock market returns. By incorporating state-dependent heteroscedasticity into the Cutler, Poterba and Summers (1991) fads model, we show that it can also lead to regime switching. Two main features of the bubbles model distinguish it from the fads model. First, the bubbles model implies that returns are drawn from two distinct regimes. Second, the bubbles model implies that deviations from fundamental price will help predict regime switches. Using US data for 1926-89, we find evidence which is consistent with the fads model even when we allow for variation in epxected dividend growth rates and expected discount rates. However, the restrictions which the fads model implies for a more general switching model are rejected. The rejections point in the direction of the bubbles model, although not all the implications of the bubbles model are supported by the data.

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Paper provided by EconWPA in its series Econometrics with number 9502004.

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Length: 52 pages
Date of creation: 07 Feb 1995
Date of revision: 06 Jun 1995
Handle: RePEc:wpa:wuwpem:9502004
Note: 52 pages of text & 2 pages graphs. Text and Graphs in separate Postscript files. Both files compressed in a single Info-zip archive, then uuencoded.
Contact details of provider: Web page: http://econwpa.repec.org

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