Bloomberg Radio host Barry Ritholtz speaks with ETF industry pioneer Dave Nadig, who currently serves as financial futurist at the data, analytics and thought-leadership firm VettaFi. Nadig, who has more than 25 years of experience in the field — including as managing editor at ETF.com — co-authored a definitive book on ETFs, “A Comprehensive Guide To Exchange-Traded Funds,” for the CFA Institute.