TV had, so far, two major generations. The first was that of limited over-the-air broadcasting, and the second, multichannel TV, based on the distribution platforms of cable, satellites, and home video players. Even though they were slow moving they had tremendous long-term impacts. In each of its generations, most users did not perceive a need for anything more advanced than they already had. And in each of these generations people did not expect the impact of the new medium when it emerged. by a wide margin.
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