Exchange-traded funds account for more than $1.1 trillion of assets invested in the U.S. That's up from $430 billion five years ago, and assets are on pace to increase 31 percent in 2012.
With such popularity has come confusion. Would-be ETF investors are confronted with more than 1,400 choices in the U.S., almost a quarter of them launched since the start of 2011. To find out what ETF experts consider the most important things for investors to know, click on.
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