What's the connection between low global interest rates, Korean retail investors, and the U.S. options market? On this week's Odd Lots podcast, we discuss the fascinating world of Korean structured notes with Benn Eifert of QVR Advisors. He explains how a very exotic type of investment sold to Korean retail investors could, through a series of hedging requirements, end up causing massive volatility in the market for S&P 500 options.