During the middle 2000's when Alan Greenspan's Fed endeavored to change the outward monetary policy stance to “tightening”, it was not unusual for some divergences to have emerged. One of those was between the federal funds rates, either target or effective, and Treasury bill equivalent yields. Under a hierarchical system, this was not unexpected or alarming except as when the distance between them became unusually large (2006). Federal funds are unsecured interbank transactions whereas Treasury bills are near equivalent to them except secured by lending cash to the federal government. One would expect bill rates to be some degree less than federal funds.
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