As the growth of the Internet flags, the people who run struggling online media, e-commerce, and networking companies think they have identified the elixir to revive it: broadband. From Cisco Systems and Intel to Sony and Yahoo!, they're all betting that high-speed Internet service will spur multimedia ads, snazzy video, and the ability to make impulse purchases—thereby getting more people on the Net to spend more time and more money. Unfortunately, it's a bad bet.
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