Abstract
Cognitive biases often influence investor behavior in developing capital markets, leading to market anomalies and affecting overall market efficiency. With the increasing integration of global financial markets and the growing participation of retail investors, understanding these biases is more critical than ever. While market anomalies have been extensively studied in developed markets, their influence in developing economies remains under-explored. This study aims to examine the impact of heuristic biases on investment decisions, focusing on Nepal’s stock market. Structural Equation Modeling is used to assess how perceived market efficiency mediates the relationship between heuristic biases and investor behavior. Data were collected from purposively selected 403 active individual investors in Nepal Stock Exchange (NEPSE). The findings reveal that representative and overconfidence biases significantly and positively influence investment decisions and market efficiency. Specifically, investors exhibiting these biases are more likely to make confident and bold investment choices, believing in their ability to predict market movements accurately. Furthermore, the study finds that perceived market efficiency mediates the relationship between anchoring and adjustment bias and investment decisions, suggesting that investors who rely heavily on initial information (anchors) adjust their decisions based on their perceptions of market efficiency. The results highlight the critical role of heuristic biases in shaping investor behavior and stress the importance of market efficiency in this process. The study emphasizes the need to enhance investor awareness of these biases and implement policies to improve market transparency and efficiency. Such measures are vital for mitigating risks and fostering a more robust and resilient financial market in developing economies like Nepal.
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