Final answer:
The false statement regarding individual investor behavior is that individual investors' portfolios consistently outperform the market averages. Many investors do not outguess the market and often fail to adequately diversify their portfolios, leading to increased risk.
Step-by-step explanation:
The statement that is not true regarding individual investor behavior is individual investors' portfolios consistently outperform the market averages. Research and historical data indicate that a majority of financial investors, including mutual funds that attempt to pick stocks projected to rise above the market average, often perform worse than the market.
This reality is juxtaposed to common individual investor behaviors such as employees overinvesting in their own company's stock, individual investors' failure to adequately diversify their portfolios, and the fact that most individual investors hold fewer than 10 stocks in their portfolio.
Diversification is highly advised because it reduces the risk associated with investing in single companies which can suffer from market fluctuations and poor managerial decisions. However, individual investors often do not diversify enough, which leads to heightened risk. The recommendation is to follow the principle of not putting all your eggs in one basket, and instead invest in a wide range of companies to balance out potential losses and gains.