12This will hold true iff the numerator on the LHS of (19) is a positive finite number; for this, we we need the condition:

ΦΦΦρ(Rβ )−1 − (1 − ℧) > 0 ΦΦΦρ > (Rβ(1 − ℧ )) ( 1∕ρ) 1 > (Rβ(1−-℧))--- = ÞÞÞΦΦΦ(1− ℧)1∕ρ. ΦΦΦ
(22)