In 2011, the Federal Reserve served up " Operation Twist ," while the European Central Bank (ECB) pledged to implement a " three-pronged debt deal " to bolster the eurozone. The ECB already is discussing a slowdown for its asset purchasing program(s) and the Fed plans to further tighten its reins, through hikes to its overnight lending rate as well as possibly selling bonds on its balance sheet. Economic cycle deterioration, asset valuation extremes, monetary policy tightening, inflationary pressures, financial instability and/or political unpredictability.