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While ETFs have been around for nearly 25 years, they have really exploded in the past five. Exploded in terms of the assets invested in these half-stock, half-fund hybrids (more than $2.5 trillion among just U.S.-listed ETFs as of December 31, 2016, according to FactSet), the sheer number of products (nearly 2,000 listed on U.S. exchanges), and the trading volume on major markets (about 30% of daily volume in the United States during 2016, according to Credit Suisse).