This is because of the close relationship between cost (per piece, delivery and stop), volume
Volume and cost have a close relationship.
Volume and cost have no relationship whatsoever.
The Edinburgh Royal Infirmary is just a short distance from the museum.
Important belongings are in the green metal box.
The woman is heading down the street.
The prices that could be successfully charged is a topic that would be given a lot of attention.
A man is out skiing with children.
People walking around a city.