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Networks sell advertising time based principally on...

Networks sell advertising time based principally on their performance among key demographic groups, which vary based on the time of day. Ratings performance in these categories gives a rough indication of network revenues, though profitability varies based on programming costs and other factors.

Prime Time: Ratings for adults 18-49

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Network Last week Season to date NBC 7.7 6.8 ABC 5.5 5.7 Fox 4.7 5.2 CBS 4.1 4.4 UPN 2.2 2.0 WB 1.4 1.3

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Size of group: 123,150.000

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