On the ninth day before Christmas, money invested in U.S.-listed exchange traded funds and exchange-traded products crossed $1 trillion for the first time. The total actually was $1.027 trillion, with $887.2 billion in ETFs and $115.5 billion in ETPs, as tabulated by BlackRock's Global ETF Research and Implementation Strategy Team.

"As market growth and product innovation proceeds, it will become only more essential for investors of all kinds to deeply understand the full range of ETF and ETP structures, benchmarks, underlying features and applications,'' said Deborah Fuhr, head of the BlackRock unit.

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