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Consumer advocate and radio host Clark Howard says that the best piece of financial advice he ever got was from the founder of Vanguard, Jack Bogle. The advice from Bogle was that an investor shouldn't worry so much about the selection of investments, but instead should worry about the expense of investments. Howard, who knows a lot about saving money himself (in travel spending, for example), points out that this advice has served him and other investors very well, given how index funds such as those championed by Bogle have outperformed the vast majority of actively managed mutual funds. It took years for this idea to become generally accepted.