What is a Dual rate structure of advertising cost for a newspaper?

Dual rate structure:

If you want to give an advertisement in Lahore daily times, Karachi daily times, islamabad daily times then the average rate cost will be come down.

Combine rate:

If you want to give advertisement in dawn or star wigger then the rate of the advertisement will be come down as the owner of the both companies is same.

Milline rate:

Milline rate structure depend on the Words used in the newspaper. E.g 1 Word of rs40 or 50rs for 1 Word.