BIG EXPENSE: A study of mutual fund expenses by three university professors focuses on costs from trades that fund managers make. They concluded that trading costs typically take a bigger bite out of investment returns than the operations costs reflected in a fund's expense ratio.
COST BREAKDOWN: Trading costs can include brokerage commissions as well as the impact that a fund's trade of a large block of shares can have on that stock's price. Typically, that impact hurts a fund's performance.
HIDDEN COST: Unlike expense ratios, fund trading costs are hard to quantify, aren't disclosed and remain largely invisible.
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