ETF investing done right

Expense ratios for ETFs vary widely. Those that track broad U.S. indexes usually charge less than 0.1% a year, those that follow quantitative strategies run around 0.7%, and leveraged funds go higher still.

So shop around. If a relatively expensive ETF offers the investing approach you want, knock yourself out. Just make sure to keep your overall portfolio's cost down by adding some core index picks. After all, the low-cost advantage is one of the key reasons to buy ETFs in the first place.

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