More viewers mean more money for Web sites, which charge advertisers based on the size of the audience they attract.

For the next few weeks, prime-time ratings will determine how much networks can charge advertisers in coming months.

Ratings are crucial to the prices networks can charge advertisers in coming months.

A great deal of fuss was made about this thrice-yearly exercise, which determines how much networks can charge advertisers.

Apple does not charge advertisers or film producers for the privilege of depicting its screen graphics.

Its audience estimates and they are estimates, as you'll see in a moment still provide a primary basis for how much networks charge advertisers.

MTV may also see these displays as revenue opportunities, but it has no plans now to charge advertisers for time on the air.

And some have recently increased the rates they charge advertisers.

"It is natural growth and we have to charge advertisers more for it," he said.

Commercial stations charge advertisers for the estimated number of listeners.