Market Efficiency, Asymmetric Price Adjustment and Over-Evaluation: Linking Investor Behaviors to EGARCH
The paper incorporates a partial asymmetric price adjustment model for individual investors action into an EGARCH model, clarifies the relationship between the price adjustment speed, the market efficiency and asymmetric price adjustment, and measures over (under)-evaluation of stock value. The stock price does not fully adjust to the market value of stocks hoped by investors and does not adjust symmetrically in upturn and downturn, if and only if the market is not efficient, and moreover the market value generally diverts from the fundamental value of stocks even though the market is efficient. As an operational example, the Tokyo stock market is found to be inefficient during 1980-2005. The speed of price adjustment is asymmetric in the 80s but symmetric in the 90s and 2000s. The over-evaluation of the market value is remarkably observed in the 80s but not in the 90s and 2000s.
|Date of creation:||Aug 2007|
|Date of revision:|
|Contact details of provider:|| Web page: http://www.econ.osaka-u.ac.jp/|
More information through EDIRC
When requesting a correction, please mention this item's handle: RePEc:osk:wpaper:0730. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Atsuko SUZUKI)
If references are entirely missing, you can add them using this form.