While conventional monetary policies involve mild modifications of various metrics, unconventional policies are aggressive endeavors for a short-term major impact. Quantitative Easing (QE) is a major component of it, envisioned more than a decade ago for strong stimulation of a distressed economy. QE refers to large-scale purchases of securities, through which central banks directly pump a tremendous amount of cash into the market. For example, the Fed had already reduced the federal funds rate to zero in 2008 amid economic deterioration. While some European countries pushed down the rate to its negative, the Fed announced a plan of buying mortgage-backed securities and debt issued by government-sponsored enterprises. This was the beginning of the five-year long expansion period for the Fed’s balance sheet as well as the debate over QE and its application.