He spent most of his working life putting together a chain of movie theatres, but it was with the purchase of Viacom, a cable company, when he was 63, that his career took off.

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And the reason is that when the channels are bundled so that the cable subscriber has to purchase the lot of them, that gives them the option of discovering something that they might not have known before, which is that by surfing around and happening upon a marginal, new, upcoming channel they might find that they like it and they might start watching it.

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Comcast is primarily a cable company, but its recent purchase of NBC Universal has generated a large content ownership facet.

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In exchange for funding the WiMax joint venture, the cable companies would get equity in the business and would be able to purchase wholesale access to the network to offer their own high-speed wireless data and voice services to customers, the people familiar with the discussions said.

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Comcast, the largest cable provider in the U.S., is in negotiations with regulators over its bid to purchase a 51% stake in NBC Universal, giving it control of a major movie studio, Universal Studios, as well as major TV channels.

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