The average diversified U.S. stock fund returned nearly 5 percent so far this year, that's according to research from Lipper. In light of Fidelity, the largest online brokerage, telling its investors outside the U.S., they can no longer buy or trade mutual funds in their accounts, investors are concerned if this is a trend going forward in the fund world. David Levine analyzes the flow of returns based on NASDAQ data and shares his insight with TheStreet's Susannah Lee. Find out what Levine thinks on passive versus active portfolio management and which beats the other. Levine also takes us inside the world of hedge funds and its flows.