Financial advisers were able to save their millionaire clients big money last year, helping to fortify the need and demand for good advice among the wealthy, Fidelity Investments found.

While 2008 was hard on nearly everyone, millionaires who worked with advisers saw their average investable assets drop 4% from $4.01 million to $3.86 million, compared to an average 18% drop from $3.45 million to $2.82 million among millionaires who didn't work with an adviser, according to Fidelity Investments' Third Annual Millionaire Outlook.

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