To start, television commercials did not exist in the 1930s. The first televised commercial was broadcast in 1941. It was a Bulova commercial.
Since then, the genesis of television commercials has seen a lot of changes.
Length of the commercial: two elements (the cost of buying air time and the amount of competition) are big limiting factors today, that didn't exist in the 1940s and 1950s. TV commercials were a lot longer, also because advertisers could hold the viewer's attention much longer: there were fewer competitive brands, especially on TV, and there were no other channels to change to.
The 1970s saw bigger restrictions in television advertising: no more cigarettes, and alcoholic beverages could be advertised only so long as they were not consumed during the commercial.
The 1980s saw a new type of commercial come into play: less jingles (catchy songs developed specifically for this purpose) and more mainstream music started appearing.
The advent of cable (which gave consumers so many more choices during a commercial break) and, later, tivo, drove advertisers to shorter, catchier commericals but - most importantly - caused the beginning of product placement, which is a new way to advertise altogether.
Finally, the use of sponsorships, to include companies buying the naming rights to stadiums and other venues, is a newer commercial output.
In progress today are commercial adaptations like interactive advertising (Comcast is testing an On Demand system where brands pop while the viewers is watching a show, and the products worn by the actor, or other items, can be purchased "on the spot").
Hope this helps!
Everything change with time.
Two words: Cigarette commercials
http://www.youtube.com/watch?v=BYgLAPhbyKg
Well, is this homework? What has your research told you? Better start Googling!
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