The structure of synthetic ETFs is not a secret.

合成ETFs结构并不是一个秘密。

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Another risk concerns a change in the nature of ETFs.

另一大风险来自交易所交易基金本身的性质变化。

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While it's also possible to short oil ETFs, no one does.

当然也有可能是短期的ETF原油基金，但是没人这样做。

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Etfs turn 20The first commercially successful U.S. exchange-trade fund (ETF) turns 20-years old this month.

FORBES: ETFs Turn 20-Years Old in the U.S.

Schwab recently introduced a line of ETFs that its customers can trade for free.

FORBES: The Economics Behind the ETF Commission Cuts

If your money is in a 401(k), you're less likely to have access to ETFs.

WSJ: ETFs for Investors Who Buy and Hold