As the ETF industry expands and products proliferate, low-cost ETFs, which are available to any investor, have branched out into almost every aspect of the market. At the end of May, there were 1,465 U.S.-listed ETFs and exchange traded notes, with $1.14 trillion in assets under management.

Read the disclaimer; Tom Lydon is a board member of Guggenheim Investments.

For more information on ETF indexing, visit our indexing category.

Max Chen contributed to this article.

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