Core Viewpoint - Diversification is essential for protecting portfolio value, but overdiversification can lead to disappointing results [1][2][4] Group 1: Importance of Diversification - Diversification helps reduce the risk of poor-performing investments by including a mix of investment types that behave differently under specific economic conditions [1][2] - A well-diversified portfolio minimizes the impact of losses from any single investment, as seen in the example of spreading investments across 20 different stocks or asset types [2] Group 2: Risks of Overdiversification - Overdiversification can dilute the overall gains of a portfolio, as high-performing assets may not significantly contribute to returns if overshadowed by numerous low-performing investments [8] - Mental fatigue can arise from managing a complex portfolio, leading to less strategic decision-making [8] - Investors may miss opportunities to invest in higher-quality assets due to spreading their money too thin [8] - Higher transaction costs can occur from managing a larger number of assets, increasing fees and management costs [8] Group 3: Signs of Overdiversification - Indicators of overdiversification include owning too many similar investments, difficulty in tracking holdings, and a portfolio performance that mirrors or underperforms the market [8] - Challenges in rebalancing due to holding many small positions and inability to recall the rationale behind several investments are also signs of overdiversification [8]