CNBC’s Bob Pisani spoke with Douglas Yones, head of exchange-traded products at the New York Stock Exchange, Salvatore Bruno, chief investment officer at IndexIQ, and Todd Rosenbluth, senior director of ETF and mutual fund research at CFRA Research. They discussed what Chinese stock delistings could mean for emerging-market funds and low-volatility ETF’s rebalancing. In the 'Markets 102' section, Bob discusses the growing dominance of ETFs.