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This study investigates the factors influencing investment decision-making within South Africa's financial markets, focusing on psychological, demographic, and external market elements. Drawing from Prospect Theory, the research reveals a deviation from traditional behavioral assumptions, highlighting that external market dynamics, rather than individual risk perceptions or demographic traits, predominantly guide investor behavior. Using a quantitative cross-sectional design, data were collected through structured questionnaires from 120 randomly selected South African investors aged 18 and older with market experience. Structural equation modelling assessed factors influencing risk perception and subsequently, investment behavior. The findings demonstrate that market-related variables significantly influence risk perception (? = 0.653, p < 0.001) and decision-making, aligning with the Efficient Market Hypothesis. In contrast to Prospect Theory's expectations, risk perception had no significant direct effect on investment choices (? = -0.009, p = 0.933). Cognitive biases and emotional influences exerted a moderate impact, while demographic characteristics, including gender, education, and experience, showed minimal influence on investment decisions, suggesting that practical market experience outweighs formal training. With robust construct validation (CR = 0.711 to 0.951), the study enhances the reliability and credibility of the findings. It highlights global regulatory frameworks as crucial for investor confidence. These results contribute to behavioral finance literature and support practical implications for policy, market transparency, and investor education. Future research should consider diverse populations and qualitative investors' perspectives.

Studies in behavioral finance have shown that human behavior often diverges from the rationality assumed by economists, as their decisions can occasionally be swayed by their emotional and psychological states. Given this concern, the study examines psychological factors influencing individual decision-making in the South African financial market. A structured questionnaire was used in collecting data from 414 participants who are individual investors actively involved in trading in the Johannesburg stock exchange market with the application of the random sampling method. The main objective of this study is to explore the psychological variables or biases that determine the investment decision-making of individual investors. Furthermore, this paper investigates psychological factors such as Anchoring, Herding, Overconfidence and Representative biases in investment decision-making. Findings revealed that all the variables, overconfidence, herding, anchoring and representative heuristics have a relationship with each other but the only variable that influences the individual investment decision is the representative heuristic while less consideration is given to another variable. The results of this study would help financial advisors understand the high importance of psychological factors and help them integrate behavioral insights into investment strategies. This will in turn help them provide better services to their clients. It will also help individual investors to acknowledge and understand the psychological factors influencing investment decisions and how to take note of them to make better decisions. Policymakers can consider the implications of psychological biases on market stability.