Because the sample of households is small relative to the total number of households, the series is notoriously volatile.

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They can reduce demand if they move in with relatives because then they will contribute to a decrease in the total number of households.

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The U.S. pay-TV market is getting saturated and there is not much room left to grow, except for relying on the growth in total number of households or poaching subscribers from competitors.

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The total number of full time, year round workers in the entire bottom fifth of households in 2004 was less than 3 million, compared to 16.4 million full time, year round workers in the top fifth of households.

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This brings the total number of local markets with HD to 67, representing nearly three-quarters of US households.

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