Looking at the future of e-commerce, Hagel (coauthor of Net Gain) and Singer, both principals in the consulting firm McKinsey & Company, add a provocative twist to the conventional view that those companies with the best information about their customers will be the most successful. They examine not only how companies can acquire information about consumers but also, crucially, how consumers can control dissemination of their personal information and even charge companies for their use of it. To the ever-expanding e-commerce lexicon they add a new term: "infomediaries." These third parties will serve both consumers and marketers: consumers will use infomediaries to help them find products at the best price, avoid unwanted product pitches and protect their privacy; in turn, via the use of sophisticated filters, infomediaries will be able to provide targeted consumer profiles to companies. The companies will then be able to anticipate consumers' needs and offer them appropriate products. While some companies, such as Intuit or AOL, currently perform some of these functions, the authors predict that the infomediaries are likely to be new companies formed by partnerships between existing firms--most likely between companies with large consumer databases and newer, more Internet-savvy entrepreneurial ventures. Well-written and full of scenarios of how these infomediaries will develop, this book will interest marketers and those consumers who are eager to explore the electronic frontiers of the economy. 50,000 first printing; $150,000 ad/promo. (Publisher Weekly)