Sürü Davranışının Hisse Senedi Fiyat Hareketliliğine Etkisi: BİST 100 Örneği
Effect of Herd Behavior on Stock Price Mobility: Example of BIST 100

Summary/Abstract: Purpose – The herd behavior, which affects the investment decisions of investors and causes them not to be rational, is considered as a concept included in behavioral finance. According to behavioral finance, the reason why investors cannot be rational in their investment decisions is due to some anomalies and herd behavior. This study aims to demonstrate the effect of herd behavior, which is a phenomenon affecting the prices of investors' financial transactions, on the stocks traded on Borsa Istanbul in financial markets. Design/methodology/approach – There are several models in the literature to measure herd behavior. In this study, it has been tried to determine the herd behavior, which is observed in Borsa İstanbul, by choosing the model that the researchers perceive as the highest in recent years, while choosing between the herd behavior models. In this study, the cross-section variability of Beta coefficients was analyzed and analyzed with Hwang and Salmon (2004) model. Findings – In the study, the existence of herd behavior was tested in Borsa İstanbul between 2009 and 2018. In the period between 01.01.2012 and 31.08.2018, the results of 233 analyzes made on a monthly basis during the period of 01.01.2012 - 31.08.2018, between months of 01.01.2012 - 31.08.2018 in 80 months on a monthly basis were found findings of herd behavior in a total of 35 months. Discussion – The rational investor perception defined by the effective market hypothesis has been transformed by behavioral finance and herd behavior. Another type of illusion is that investors simulate each other's financial decisions. This situation is called as behavioral behavior in behavioral finance literature and it appears to affect price mobility.

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