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What's behind the boom in bond ETFs

There's been a boom in bond ETFs. Assets have skyrocketed to $1 trillion and BlackRock predicts they'll double in just four and a half years. BlackRock's iShares also happens to be the biggest player in ETFs overall. iShares fixed income strategist at BlackRock, Jon Rather, talks with Yahoo Finance's Julie Hyman, Adam Shapiro and Sibile Marcellus.