Seventy percent of radio´s ad revenues come from what source?

Name: Seventy percent of radio´s ad revenues come from what source?
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Local spot sales, where businesses purchase advertising time on a specific radio station, account for the largest portion of radio's ad revenues. National ad agencies and tradeouts are also sources of revenue, but they do not make up as large of a percentage as local spot sales. Listener donations are not a significant source of revenue for radio stations.

Seventy Percent of Radio´s Ad Revenues Come from What Source