본 연구는 개인투자자의 비합리적 투자의사결정 및 투자행동에 영향을 미치는 중요한 심리적 요인 중 하나가 개인투자자의 과신이라는 많은 행동재무론적 연구결과들을 중심으로, 개인투자자의 투자에 대한 확신(투자확신)에 영향을 미치는 자기고양적 지각 요인들을 탐색적으로 알아보았다. 또한, 개인투자자의 주식투자와 관련된 자기고양적 지각 요인이나 투자확신과 같은 심리적 요인이 개인의 잘못된 위험투자행동에 영향을 미치는지를 알아보았다. 연구결과, 개인투자자의 투자확신에 영향을 미치는 자기고양적 지각 요인과 투자확신에 있어 남녀 간의 차이가 발견되었다. 즉, 남성 투자자의 경우에는 ‘자신의 투자능력에 대한 긍정적 평가’ 요인이, 여성 투자자의 경우에는 ‘수익률에 대한 낙관적 기대’ 요인이 투자확신에 영향을 미치는 것으로 나타났으며, 남성 투자자가 여성 투자자에 비해 투자에 대해 더 확신하는 것으로 나타났다. 또한, 개인투자자의 ‘자신의 투자능력에 대한 긍정적 평가’, ‘자신의 통제가능성에 대한 확신’, 그리고 ‘수익률에 대한 낙관적 기대’와 같은 자기고양적 지각 요인이나 투자확신과 같은 심리적 요인들이 개인의 잘못된 위험투자행동에 영향을 미칠 수 있음을 부분적으로 증명하였다. 그러나 그 영향은 크지 않아, 개인투자자의 심리적 요인과 잘못된 위험투자행동 간을 매개해 줄 수 있는 여러 다른 변수들에 대한 연구가 필요함을 시사해준다.
This study is an exploratory study on stock investment behaviors of individual investors in psychological perspective. The study is based on many behavioral finance studies which overconfidence of individual investors has an effect on irrational investment decision making and investment behaviors such as excessive trading. Accordingly, this study was to investigate the factors of self-enhancement perception on confidence of investment of individual investors and to find whether these psychological biases lead to irrational investment behaviors. The results indicated that there were sex differences in the factors of self-enhancement perception on individual investors' confidence of investment. In case of male investors, they were confident of their ability of investment but in case of female investors, they were confident of optimistic expectation of return. Also, male investors were more confident of investment than female investors. In addition, the result showed that risky investment behaviors of individual investors were influenced by psychological factors such as favorable self-evaluation, confidence of self-controllability, optimistic expectation of return and confidence of investment in part. This study suggests that further researches need to search after other variables which can mediate between psychological factors and investment behaviors of individual investors.
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