Behavioral Finance and Its Impact on Individual Investment Decisions

Behavioral finance has emerged as a significant interdisciplinary field that integrates psychology, sociology, and finance to explain irrational financial decision-making among investors. Traditional financial theories, particularly the Efficient Market Hypothesis (EMH) and Modern Portfolio Theory (MPT), assume that investors act rationally and always seek to maximize utility. However, real-world financial markets frequently demonstrate anomalies such as speculative bubbles, panic selling, overconfidence-driven trading, and herd behavior, which cannot be fully explained by classical theories. This research paper examines the influence of behavioral finance on individual investment decisions by analyzing psychological biases, emotional influences, and cognitive heuristics affecting investors. The study adopts a descriptive and analytical research design using both primary and secondary data. Primary data were collected through structured questionnaires administered to individual investors, while secondary data were gathered from scholarly articles, journals, financial reports, and market studies published between 2019 and 2025. Statistical techniques including percentage analysis, mean analysis, correlation analysis, and graphical interpretation were used to evaluate investor behavior patterns.
The findings indicate that behavioral biases such as overconfidence bias, loss aversion, anchoring, herd mentality, confirmation bias, and mental accounting significantly affect investment decisions. Emotional responses to market volatility also influence risk perception and portfolio diversification. The research further demonstrates that investors with limited financial literacy are more vulnerable to irrational decision-making. Real-world examples including retail investor behavior during the COVID-19 market crash and meme-stock trading illustrate the practical implications of behavioral finance. The study contributes to academic literature by highlighting the growing relevance of behavioral finance in modern investment management and provides recommendations for investors, financial advisors, policymakers, and financial educators. The paper concludes that integrating behavioral insights into financial planning can improve investment outcomes and promote more stable financial markets.