How do big companies get companies to sign up for advertising? Is there a 3rd party that does it for them?

Question

How do big companies get companies to sign up for advertising? Is there a 3rd party that does it for them?

Answer 1

Most of them don't have to. The companies line up and give proposals. If you are a smaller firm and need to find an advertiser, first talk to your Chamber of Commerce for referrals, then talk to other business owners.

Answer 2

The large media companies have their own sales-forces.  Some local TV/radio station groups use national representative services to represent them across the country.  Most large advertisers use advertising buying services (arms of national agency groups) to buy media for them.