Who buys advertising for big companies such as bell, rogers, nestle, revlon, koodo

ABCD

New member
etc...? What are the company names that buy advertising for them such as on billboard, newspapers, tv etc...
do they have their own department or do they hire a third party to buy media space for them??

For example, if I own a newspaper and want bell or koodo to advertise who do I go to to tell them about my paper and ask if they want to advertise?

Also, does anybody know of a list that exists for these companies...
 
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