Given Our Inevitably Incomplete Knowledge About Key Structural Aspects Of Our Ever-changing Economy And The Sometimes Asymmetric Costs Or Benefits Of Particular Outcomes, A Central Bank... Need To Consider Not Only The Most Likely Future Path For The Economy But Also The Distribution Of Possible Outcomes About That Path. They Then Need To Reach A Judgment About The Probabilities, Costs, And Benefits Of The Various Possible Outcomes Under Alternative Choices For Policy.