ETF Trends’ Tom Lydon talks year-to-date ETF flows and performance.  Newfound Research’s Corey Hoffstein explains the concept of “return stacking” and highlights their suite of Structural Alpha model ETF portfolios.  Bloomberg’s Eric Balchunas discusses his new book, “The Bogle Effect: How John Bogle and Vanguard Turned Wall Street Inside Out and Saved Investors Trillions”.