"The Demos study, released last month, is just the latest in a long string of research showing 401(k) plans are a better deal for Wall Street than for you. Many show that people lose about one-third of their retirement money to fees that they don't even know they're paying. The actual lifetime impact of fees is a matter of widespread debate, but it shouldn't be. In one dramatic example, John Bogle, the inventor of index funds, demonstrated how fees can consume 80 percent of an investor's money through something he'd dubbed 'the tyranny of compounding fees.'"

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