ranging from the 12 months to 15 years through August 2014. Over every period and in every category, the average low-cost fund ranked better than the average high-cost fund. For instance, the average low-cost domestic stock fund ranked in the top 39% of its peers over the 10-year period I examined, while the average high-cost fund finished in the top 53% (or in the bottom 47%, if you prefer to look at it that way).
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