Anchor: Of course, the cost of providing delivery by a single firm could also be compared with the cost of three or more firms.
Entailed: Obviously, you could compare the cost of delivery by a single firm to that by multiple firms. 
Contradiction: There is no way to compare delivery costs. 
Contradiction: They only have volunteers in this part of the country.
Contradiction: Periodicals are cheap to mail.
Contradiction: Hers would likely be the worst.
Contradiction: I don't know what street it's on.