The ongoing, rapid growth of ETFS begs a question: is it sustainable, or will the market soon find itself in a bubble? A new global report on the ETF industry says there is little to stop its momentum.

"There are many large and well-established firms which have significant resources and distribution networks to meet the current and future demand of various institutional and retail investors who are looking to use ETFs as part of their investment strategies," says Bill Donahue, managing director, ETF practice leader with PwC in the U.S.

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