The Internet Runs on Ad Billions

Consumers enjoy a vast range of Web services, from e-mail to e-commerce, all funded by advertisers. Regulators tinker with this at their peril

From the basement of his house in San Francisco, Chris Lindland runs a successful specialty retail business that sells horizontal corduroy pants to customers across the country. Tim Carter turned years of hands-on experience as a building contractor in Ohio into a new career as Webmaster of "," a venture that in its first year netted him more than four times the income he earned in his best year as a builder.

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