Also two others. Three original networks were set up to deliver radio programming nationwide. No network can have two affiliates in the same broadcast area. Affiliates use network programming, but are owned by someone else. Loss of media voices.
Many chains own more than one type of media property.
Gannett also owns TV and radio stations. Sony owns Columbia Pictures. Other media groups owned by conglomerates. An attempt to control several different related aspects of media business at once, each part helping the others. Media acquisitions are rampant.