How do cognitive biases affect individual investors’ decision-making? A Dhaka Stock Exchange case

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Type of the article: Research Article

Abstract
In an attempt to examine the relevance of behavioral finance in the capital market of Bangladesh, this study intends to investigate which cognitive biases and behavioral errors lead to the psychological biases ultimately affecting the rationality of individual investors’ choice of investment pattern on the Dhaka Stock Exchange. A structured survey questionnaire is used, identifying 32 factors grouped into seven separate quantitative variables – accounting, technical, diversification, herding, heuristics, market, and personality – to evaluate against one dependent variable: the demand for common stock. The database has been developed for a one-year tenure from January 2024 to January 2025. The paper applies multiple Regression Analysis and Chi-Square tests on 424 active investor responses after confirming the reliability and validity of the variables. The findings reveal that, except for diversification, five independent variables – market, accounting, technical, herding, and heuristics – appear significant at the 1% significance level, while personality significantly affects the rationality of investment behavior at the 5% significance level. This confirms the existence of psychological and cognitive biases that disrupt the individual investment patterns of investors at the Dhaka Stock Exchange. Consequently, this study recommends that more awareness and financial literacy should be introduced by formal training and counselling sessions in exchange for the better restoration of confidence and literacy of investors in their respective belongingness to the financial market.

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    • Table 1. Variable descriptions
    • Table 2. Cronbach’s alpha for the reliability test
    • Table 3. Validity test of the variables
    • Table 4. Multi-collinearity test for independent variables
    • Table 5. Chi-square test summary
    • Table 6. Multiple regression
    • Table 7. Summary of hypothesis testing
    • Conceptualization
      Farhana Yasmin, M. Shahin Sarwar
    • Data curation
      Farhana Yasmin, M. Shahin Sarwar
    • Formal Analysis
      Farhana Yasmin, M. Shahin Sarwar
    • Funding acquisition
      Farhana Yasmin, M. Shahin Sarwar
    • Investigation
      Farhana Yasmin, M. Shahin Sarwar
    • Methodology
      Farhana Yasmin, M. Shahin Sarwar
    • Project administration
      Farhana Yasmin, M. Shahin Sarwar
    • Resources
      Farhana Yasmin, M. Shahin Sarwar
    • Software
      Farhana Yasmin, M. Shahin Sarwar
    • Supervision
      Farhana Yasmin, M. Shahin Sarwar
    • Validation
      Farhana Yasmin, M. Shahin Sarwar
    • Visualization
      Farhana Yasmin, M. Shahin Sarwar
    • Writing – original draft
      Farhana Yasmin, M. Shahin Sarwar
    • Writing – review & editing
      Farhana Yasmin, M. Shahin Sarwar