With their low fees all-day trading and tax efficiency exchange-traded funds have captivated investors. There were no ETFs before 1993; today there are nearly 700. While most experts think ETFs were a good innovation -- built like index-style mutual funds but traded like stocks -- some worry that the increasingly specialized ETFs introduced in recent years stray from the faith encouraging too much risk-taking. That concern is heightened by recent Securities and Exchange Commission proposals to let new funds come to market with less oversight and to invite proposals for introducing actively managed ETFs. Knowledge at Wharton looks at the recent action and angst surrounding ETFs.

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