Speed of Adjustment Scurities Prices, A Method for Evaluating of Investors Overreaction & Underreaction and Financial Markets Efficiently: Approches, Models and Results

Subject Areas : Journal of Investment Knowledge

Hashem  Nikoumaram ¹ (Prof.,Management and Economic Faculty, Islamic Azad University, Science and Research Branch)
Ali  Saeedi ² (Assistant Prof., Management and Social Science Faculty, Islamic Azad University, North Tehran Branch)
Fereydoun  Rahnamay Roodposhti ³ (Proffesor in Management and Economic Faculty, Islamic Azad University, Science and Research Branch)
Mahdi  Madanchi Zaj ⁴ (Ph.D. Student in Financial Management, Islamic Azad University, Science and Research Branch)

Received: 2014-12-29 Accepted : 2015-04-09 Published : 2015-04-09

Keywords: Overr reaction, Under Reaction, Speed of Adjustment Price, Market Efficiently,

Abstract :

Overreaction and underreaction phenomena in financial markets reflect it’s inefficiently. Different methods are suggested for evaluation of overreaction and under reaction in researches. One of these methods is measurement of the securities price adjustment speed. Speed of price adjustment securities is time duration that information absorbed in stock prices and reach stock price to their intrinsic values. At this article, is classified several researches to three approaches and described different models and then presented their results. Also the determinants for delayed Stock price adjustment is described and finally is explored Iran capital market specifications and propose some practical suggestions for increasing the stocks adjustment speed improving capital market efficiently.