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The life of a financial adviser can be very tricky. Many of them believe that leaving a client's investments alone is the best option, but when, year after year, clients come in asking what the best course of action is for their money, what do you tell them? Jack Bogle, who 40 years ago founded the mutual fund giant Vanguard (it now has about $3 trillion of assets under management), explains exactly what a financial adviser should do and what a financial adviser should say.

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