In the early 1950s, the DuMont Television Network began the modern trend of selling advertisement time to multiple sponsors. Previously, DuMont had trouble finding sponsors for many of their programs and compensated by selling smaller blocks of advertising time to several businesses. This eventually became the standard for the commercial television industry in the United States. However, it was still a common practice to have single sponsor shows, such as The United States Steel Hour. In some instances the sponsors exercised great control over the content of the show - up to and including having one's advertising agency actually writing the show. The single sponsor model is much less prevalent now, a notable exception being the Hallmark Hall of Fame.

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The 1960s saw advertising transform into a modern approach in which creativity was allowed to shine, producing unexpected messages that made advertisements more tempting to consumers' eyes. The Volkswagen ad campaign'featuring such headlines as "Think Small" and "Lemon" (which were used to describe the appearance of the car)'ushered in the era of modern advertising by promoting a "position" or "unique selling proposition" designed to associate each brand with a specific idea in the reader or viewer's mind. This period of American advertising is called the Creative Revolution and its archetype was William Bernbach who helped create the revolutionary Volkswagen ads among others. Some of the most creative and long-standing American advertising dates to this period.

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The late 1980s and early 1990s saw the introduction of cable television and particularly MTV. Pioneering the concept of the music video, MTV ushered in a new type of advertising: the consumer tunes in for the advertising message, rather than it being a by-product or afterthought. As cable and satellite teevision became increasingly prevalent, specialty channels emerged, including channels entirely devoted to advertising, such as QVC, Home Shopping Network, and ShopTV Canada.

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Marketing through the Internet opened new frontiers for advertisers and contributed to the "dot-com" boom of the 1990s. Entire corporations operated solely on advertising revenue, offering everything from coupons to free Internet access. At the turn of the 21st century, a number of websites including the search engine Google, started a change in online advertising by emphasizing contextually relevant, unobtrusive ads intended to help, rather than inundate, users. This has led to a plethora of similar efforts and an increasing trend of interactive advertising.

The share of advertising spending relative to GDP has changed little across large changes in media. For example, in the U.S. in 1925, the main advertising media were newspapers, magazines, signs on streetcars, and outdoor posters. Advertising spending as a share of GDP was about 2.9 percent. By 1998, television and radio had become major advertising media. Nonetheless, advertising spending as a share of GDP was slightly lower'about 2.4 percent.[9]

A recent advertising innovation is "guerrilla marketing", which involve unusual approaches such as staged encounters in public places, giveaways of products such as cars that are covered with brand messages, and interactive advertising where the viewer can respond to become part of the advertising message.Guerrilla advertising is becoming increasing more popular with a lot of companies. This type of advertising is unpredictable and innovative, which causes consumers to buy the product or idea. This reflects an increasing trend of interactive and "embedded" ads, such as via product placement, having consumers vote through text messages, and various innovations utilizing social network services such as MySpace.

[edit] Public service advertising

The same advertising techniques used to promote commercial goods and services can be used to inform, educate and motivate the public about non-commercial issues, such as HIV/AIDS, political ideology, energy conservation and deforestation.

Advertising, in its non-commercial guise, is a powerful educational tool capable of reaching and motivating large audiences. "Advertising justifies its existence when used in the public interest - it is much too powerful a tool to use solely for commercial purposes." - Attributed to Howard Gossage by David Ogilvy.

Public service advertising, non-commercial advertising, public interest advertising, cause marketing, and social marketing are different terms for (or aspects of) the use of sophisticated advertising and marketing communications techniques (generally associated with commercial enterprise) on behalf of non-commercial, public interest issues and initiatives.

In the United States, the granting of television and radio licenses by the FCC is contingent upon the station broadcasting a certain amount of public service advertising. To meet these requirements, many broadcast stations in America air the bulk of their required public service announcements during the late night or early morning when the smallest percentage of viewers are watching, leaving more day and prime time commercial slots available for high-paying advertisers.

Public service advertising reached its height during World Wars I and II under the direction of several governments.

[edit] Types of advertising