This undated photo provided by S&P Capital IQ shows Todd Rosenbluth, director of exchange-traded fund research with S&P Capital IQ. Rosenbluth says the number of conventional ETFs on the market may

... more 

This undated photo provided by S&P Capital IQ shows Todd Rosenbluth, director of exchange-traded fund research with S&P Capital IQ. Rosenbluth says the number of conventional ETFs on the market may be hitting a ceiling, as it’s become increasingly difficult to launch new products that differ from existing ETFs. (AP Photo/S&P Capital IQ) less 

1 / 17
Associated Press
Thu, May 16, 2013 10:53 PM EDT