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Initially the idea of radio advertising was extremely controversial. An article in the November 1922 issue of Radio Broadcast magazine lamented that "driblets of advertising... are floating through the ether every day" and expressed concern that "The woods are full of opportunists who are restrained by no scruples when the scent of profit comes down the wind."[18] Even though until the mid-1920s a few stations held out against carrying commercials, no other financing scheme proved practical, and by the late-1920s most U.S. radio stations were carrying commercially-sponsored programs.
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From here:
https://en.m.wikipedia.org/wiki/Radio_advertisement
Early tv shows were live, as were the commercials.
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The very first television ad appeared on July 1, 1941 during a baseball game on a local channel in New York. It was a ten-second commercial advertising Bulova watches and cost a mere four dollars, but it completely revolutionized both television and advertising.
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