约翰・哈格尔是麦肯锡公司硅谷办事处主任以及该公司交互多媒体实践的领导人。他是畅销书《网络利益――通过虚拟社会扩大市场》（哈佛商学院出版社出版）的作者之一。

马克・辛格是麦肯锡公司旧金山办事处主任，他在那儿参与领导了该公司的连续关系营销实践。

Consumers already recognize the need to protect their privacy when using the Internet to communicate, browse for information, and purchase goods and services. With Net Worth, authors Hagel and Singer build an intriguing scenario in which customers take control of their personal data and refuse to surrender it without some compensation. As customers search for the best deal and the safest place for their information assets, an opportunity emerges for firms to leverage new, web-based strategies and act as infomediaries--brokers or intermediaries who help customers maximize the value of their data. Net Worth constructs a new business model around the infomediary, and reveals the coming battle among infomediaries for customers' trust and private information. The authors examine the opportunities the infomediary will present for businesses and consumers alike, as customer-centric brands rise up as the primary source of new value creation, forcing companies to reassess the nature of their core businesses and their long-held beliefs about brands and marketing.