A comparison of two upper bounds for the tails of compound distributio
ns, both defined in terms of a new worse than used (NWU) distribution,
reveals that one is sharper in the decreasing failure rate (DFR) case
. An inductive argument is employed to construct a lower bound in term
s of a new better than used (NBU) distribution which is a dual to the
upper bound. It is also sharper than the corresponding lower bound in
the increasing failure rate (IFR) case. Applications to ruin theory ar
e then given.