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Since inception in the US in 1940, [[television commercial|TV commercial]]s have become one of the most effective, most persuasive, and most popular methods of selling products of many sorts, especially consumer goods. US [[advertising]] rates are determined primarily by [[Nielsen Ratings]].

 

===Technology trends===

In its infancy, television was an ephemeral medium. Fans of regular shows planned their [[TV listings|schedules]] so that they could be available to watch their shows at their time of broadcast. The term ''appointment television'' was coined by marketers to describe this kind of attachment.