نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
study is to investigate the contagion caused by the release of good and bad news in the stock market with the MGARCH model approach. The statistical population of the current study includes banks admitted to the Tehran Stock Exchange. The time period of this study was chosen according to the availability of information in the period of 2011-2021. study are the stock price and the index of good and bad news, which is considered to be zero in the case of bad news (negative stock return rate or number one) and zero in the case of good news (positive stock return rate). In order to achieve the goal of the research, EGARCH and TARCH methods were used to model the effects of good and bad news on the fluctuations of the stock returns of each of the studied banks, then, in the form of the MGARCH model, the effects related to the contagion of the risk of turbulence caused by news on the bank. were checked. Empirical evidence from the use of volatility models for banks admitted to the Tehran Stock Exchange has indicated that the effect of positive and negative price shocks on future price fluctuations is statistically different, and positive and negative news have asymmetric effects on volatility.
کلیدواژهها English