Big Three television networks
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The Big Three television networks are the three traditional commercial broadcast television networks in the United States: ABC, CBS and NBC. From the 1950s to the late 1980s, the Big Three networks dominated U.S. television.
The National Broadcasting Company (NBC) and Columbia Broadcasting System (CBS) were both founded as radio networks in the 1920s, with NBC eventually encompassing two national radio networks, the prestige Red Network and the lower profile Blue Network. They gradually began experimental television stations in the 1930s, with commercial broadcasts being allowed by the Federal Communications Commission in 1941. In 1943, the U.S. government determined that NBC's two-network setup was anticompetitive and forced it to spin off one of the networks; NBC chose to sell the Blue Network operations, which became the American Broadcasting Company (ABC).
All three networks began regular, commercial television broadcasts in the 1940s. NBC and CBS began commercial operations in 1941, followed by the DuMont Television Network in 1944 and ABC in 1948. The three networks originally controlled only a few local television stations, but they swiftly affiliated with other stations to cover almost the entire United States by the late 1950s. Several of these stations affiliated with all three major networks and DuMont, or some combination of the four, in markets where only one or two television stations operated in the early years of commercial television; this resulted in several network shows (often those with lower national viewership) receiving scattershot market clearances, since in addition to maintaining limited broadcast schedules early on, affiliates that shoehorned programming from multiple networks had to also make room for locally produced content. As other stations signed on in larger cities, ABC, NBC and CBS were eventually able to carry at least a sizeable proportion of their programming on one station.
Of the four original networks, only DuMont did not have a corresponding radio network. Conversely, the fourth major radio network of the era, the Mutual Broadcasting System, never attempted to enter television, nor did it pursue any sort of affiliation with its television-only counterpart, DuMont.
Competition from other networks
For most of the history of television in the United States, the Big Three dominated, controlling the vast majority of television broadcasting. DuMont folded in August 1956; the NTA Film Network signed on that year and lasted until 1961. From 1961, and lasting until the early 1990s, there were effectively only three major networks. Every hit series appearing in the Nielsen top 20 television programs and every successful commercial network telecast of a major feature film was aired by one of the Big Three networks. There were attempts by other companies, such as the Overmyer Network, to enter the television medium, but all of these ventures lasted for brief periods. The prohibitive cost of starting a broadcast network, coupled with the difficulty of competing with the massive distribution of the Big Three networks, and the infancy and complexities of UHF broadcasting before cable television became commonplace in the 1980s, led to the downfall of almost all new network ventures; most media markets were limited to no more than three VHF channels, and even after the All-Channel Receiver Act was passed in 1961, the VHF stations were far more efficient and their signals could reach a greater range than their UHF counterparts. As the Big Three networks had already affiliated with most of the more desirable VHF stations, and the full-service approach of the time meant that the networks programmed almost the entire broadcast day (leaving little room for even off-prime-time programming), that left any upstart network to settle for the inferior UHF outlets. Those networks that could have had the resources to compete, such as Canada's CTV Television Network (which briefly attempted an American expansion via WNYP (channel 26) in Buffalo, New York, now a religious station), were forced off the air through legal threats.
A viable fourth television network in the commercial sense would not again become competitive with the Big Three until Fox was founded in October 1986 (from some of the assets/remnants of the DuMont network, which became Metromedia after DuMont folded, and were acquired by News Corporation earlier in 1986). Fox, which began as a distant fourth network, leapfrogged into major network status in 1994 after must-carry rules took effect; the rules allowed Fox affiliates to force their way onto cable lineups, and the network's affiliation deal with New World Communications (which it later purchased in 1996) and the acquisition of National Football League broadcast rights brought a wave of new Fox affiliates. Since its founding, Fox has surpassed ABC and NBC in the ratings during the early primetime hours in which it competes against the longer established networks, becoming the second most-watched network behind CBS during the 2000s. During the 2007-08 season, Fox was the highest-rated of the major broadcast networks (as well as the first non-Big Three network to reach first place), but lost the spot in the 2008-09 season and dropped to a close second. From 2004 to 2012, Fox also dominated U.S. television in the lucrative and viewer-rich 18-49 demographics, in large part due to the success of its NFL coverage and its top rated prime time program, American Idol.
Although Fox has firmly established itself as the nation's fourth major network with its ratings success, it is not considered part of the Big Three. Among Fox's differences with the Big Three is its weekday programming, which lacks national morning and evening news programs (Fox has a news division with cable and radio operations, but does not provide content for the broadcast television network other than a weekly news analysis program, limited special reports and an affiliate news service for its stations called Fox News Edge), daytime programming, a third hour of primetime, late-night talk shows, and Saturday morning children's programming (although Fox had an extensive lineup of children's programs throughout the 1990s before selling its children's division to The Walt Disney Company in 2001 as part of its sale of cable network Fox Family Channel, after which 4Kids Entertainment supplied the network's children's lineup until 2009). Local affiliates either produce their own programming during these times or run syndicated shows. Fox is also the only one of the four major networks to include a regular block of infomercials on its lineup, via the Weekend Marketplace Saturday morning block. However, given the network's success in its prime time and sports offerings, it has been occasionally included with the Big Three, in which case the phrase "Big Four" is used.
Other networks eventually launched in an attempt to not only compete with the Big Three as well as Fox, although these "netlets" have been unable to ascend to the same level of success. The WB and UPN launched in January 1995; like Fox, they both added nights of prime time programming over the course of a few years (though The WB was the only one that aired any on weekends, carrying a Sunday night lineup for all but its first half-season on the air). Both networks mainly aired only prime time and children's programming (the latter was the only form of weekday daytime programming offered by either one, although UPN discontinued its children's lineup in 2003 at the conclusion of a content deal with Disney), though UPN did air sports programming via the short-lived Xtreme Football League (XFL) in 2001 as part of a deal with World Wrestling Entertainment (which also gave it the rights to air WWE Smackdown). While The WB and UPN each had a handful of popular series during their existences, struggling overall viewership and financial losses led their respective parent companies, CBS Corporation and Time Warner, to shut them down in September 2006 to jointly launch The CW, which initially featured a mix of programs from both predecessors as well as some newer shows. MyNetworkTV launched at the same time as The CW, with a lineup of English language telenovelas; it later shifted toward unscripted programs and movies, though its persistent lack of ratings success led News Corporation to convert it into a programming service, relying on a lineup of acquired series, in 2009.
Likewise, the Public Broadcasting Service (PBS), which has existed since 1970, is not considered part of the "big three" networks. PBS operates as a noncommercial service with a much different distribution model compared to the major networks; most uniquely, its member stations in essence own the network rather than the traditional mode of a network owning some of its stations and affiliating with additional stations owned by other broadcasters, and that it maintains memberships with more than one educational station in a few markets (prior to the 1990s, some commercial broadcast networks maintained affiliations with two stations in a few markets, with both stations carrying a share of the network's programming lineups).
Today, the "Big Three" control only a (relatively) small portion of the broadcasting market in the United States, which in 2005, was estimated at a combined 32%. The Big Three's market share has dwindled considerably as a result of growing competition from broadcast networks such as Fox, The CW and MyNetworkTV and more recently Spanish language networks such as Univision and Telemundo, as well as national cable and satellite channels such as TNT, ESPN and AMC.
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