An analysis of the intensity of capital market rationality in intraday
DOI:
https://doi.org/10.6008/CBPC2179-684X.2019.002.0003Keywords:
Intraday, Market Efficiency, Rationality, Behavioral FinanceAbstract
This empirical-analytical research tests market efficiency and investor behavior by analyzing, through a case study, the shares of Banco Itaú Unibanco, following the announcement of material facts with the Brazilian Securities and Exchange Commission. (CVM). The research is based on intraday stock data in an attempt to capture the intensity of rationality, early investor behavior after the announcement, the level of efficiency and understanding of dynamic and static relevant information. For the analysis and comparison of data in the ex ante and ex post periods, the Event Study methodology was used, following the procedures proposed by Mackinlay (1997). The main contribution of the research lies in the analysis of the behavior of intraday day-to-day stock movements, as previous studies have analyzed the intraday movement of groups of companies or company portfolios. The predominance of the results suggests that certain factors such as herd effect, availability heuristics and loss aversion were characterized by untimely and abnormal volatility compared to the estimation window - a fact that does not ensure the existence of an efficient market in the next few minutes. dissemination of selected relevant information.
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