Anchor: The purpose here is not to provide reasons or to quantify why the mailer/competitor might be able to do the work for less than the postal service, despite the likelihood that the mailer/competitor's scale of operations will be smaller.
Entailed: It is likely that a competitor might have a smaller scale of operations compared to the postal service.
Contradiction: The purpose is to give reasons why the mailer might be cheaper than the postal service.
Contradiction: I agree with your statement one hundred percent and believe that what you said is factual information. 
Contradiction: Humans in a park
Contradiction: Companies never sponsor any of the balloons.
Contradiction: A man is riding skateboard.