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iShares Core S&P U.S. Total Market Index ETF (XUU $63.20)
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Vanguard U.S. Total Market Index ETF (VUN $114.71)
Q: Please correct me where I am wrong, but these two ETF's track the same index (un-hedged US total market), but in spite of XUU having a lower MER, VUN seems to be the more popular choice, as well as seems to have a higher amount of daily trading volume. Any idea why?