If '4) Not enough is known about how nontransportation costs vary with distance.' is true, does it logically mean that 'The ways in which distance affects nontransportation costs is a subject we don't have enough information on.' also is?
4) Not enough is known about how nontransportation costs vary with distance.###The ways in which distance affects nontransportation costs is a subject we don't have enough information on.