FLOORED!

In October 2008, as the U.S. economy plunged, the Federal Reserve began paying interest on banks' reserve balances. The resulting switch to a "floor system" of monetary control, in which changes in the interest rate on reserves, rather than reserve creation or destruction, became the Fed's chief tool for influencing economic activity, was to have far-reaching consequences--almost all of them regrettable. Besides intensifying the downturn by causing banks to hoard reserves, the floor system all but destroyed the market for unsecured interbank loans that had been banks' ordinary "first resort" source of last-minute liquidity.