It is far more likely that a monopoly for delivery alone would produce net benefits for consumers than would a monopoly that included processing and transportation as well as delivery.
A monopoly on delivery is desirable because the legal status of government delivery personnel makes them preferential.  
mnli hypothesis: A monopoly on delivery is desirable because the legal status of government delivery personnel makes them preferential.   premise: It is far more likely that a monopoly for delivery alone would produce net benefits for consumers than would a monopoly that included processing and transportation as well as delivery.