Condition (ii) restricts the (marginal) persistence in abnormal earn ings. The lower bound, 0011 ;;:: 0, eliminates implausible oscillating persis tence. The upper bound, 0011 < 1, permits positive (or zero) persistence, but implies the (marginal) effect decays (geometrically) with time. Acor responding decaying persistence effect applies to future cash flows.18 Hence,