The Fed keeps buying roughly $85 billion in bonds a month, chronically delaying so much as a minor QE taper. Over five years, its bond purchases have come to more than $4 trillion. Amazingly, in a supposedly free-market nation, QE has become the largest financial-markets intervention by any government in world history. And the impact? Even by the Fed's sunniest calculations, aggressive QE over five years has generated only a few percentage points of U.S. growth. Having racked up hundreds of billions of dollars in opaque Fed subsidies, U.S. banks have seen their collective stock price triple since March 2009....