In a conference presentation Sunday (.pdf), St. Louis Fed President James Bullard called for a Taylor-type rule to adjust policy on the central bank's asset purchases the same way it's applied to rates. He said unemployment may yet be headed to double digits, and worries that belief in a large output gap is overplayed - and so he's concerned about inflation in the medium term (though he's not set to get a vote on the Open Market Committee until next year).