($MACRO) FED KOCHERLAKOTA: Inflation, unemployment signal no need to expand policy further, while there's 'no reason' to revisit the recent decision.Too-easy policy risks above-target inflation, case for additional easing should be made on merits.Undoing pledge would harm future commitments by the Fed. Conditional commitments have been a useful tool.Will abide by the Fed's pledge to retain the zero interest rate policy til mid-2013.