by JEFF COX, CNBC

The Federal Reserve met market expectations Wednesday with another round of easing, this time with a pledge to keep interest rates low until unemployment falls below 6.5 percent and inflation tops 2.5 percent.

Economists had been expecting the Federal Reserve to accelerate its debt buying program, known as quantitative easing, to the tune of another $45 billion a month, and the central bank came through.

Coupled with its move to buy $40 billion of mortgage-backed securities a month, that would bring the Fed balance sheet expansion to another trillion dollars or so in 2013 and $4 trillion overall.

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