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The Two Least Understood Investment Rules That Most Hurt 401(k) Investors
Fiduciary News; registration may be required Link to more items from this source
Apr. 16, 2013
"[A]cademic research suggests the optimal portfolio size is between 30 and 50 stocks ... Beyond this number, the cost of diversification tends to eat away at the portfolio's investment performance.... [T]he average number of holdings in the typical mutual fund far exceeds this optimal portfolio.... Why do so many retirement investors believe they should buy more than 2-3 mutual funds, which in themselves are already diversified portfolios?"

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