凯斯•R.桑斯坦，现为美国哈佛大学法学院教授，奥巴马竞选团队的法律事务顾问，美国艺术与科学院院士，美国律师协会分权与政府组织委员会副主席，美国法学院联合会行政法分会主席。桑斯坦还是《新共和》（New Republic）和《美国前景》（American Prospect）的社论撰稿人，也经常是《纽约时报》和《华盛顿邮报》这类出版物的撰稿人。他的许多著作已经被译为中文，包括：《权利的成本——为什么自由依赖于税》（与斯蒂芬•霍尔姆斯合著，毕竞悦译，北京大学出版社，2004年），《偏颇的宪法》（宋华琳、毕竞悦译，北京大学出版社，2005年），《网络共和国》（黄维明译，上海人民出版社，2003年），《就事论事》（泮伟江译，北京大学出版社，2007年），《行为法律经济学》（成凡等译，北京大学出版社，2006年），《设计民主》（金朝武译，法律出版社，2006年）等。

The rise of the "information society" offers not only considerable peril but also great promise. Beset from all sides by a never-ending barrage of media, how can we ensure that the most accurate information emerges and is heeded? In this book, Cass R. Sunstein develops a deeply optimistic understanding of the human potential to pool information, and to use that knowledge to improve our lives.

In an age of information overload, it is easy to fall back on our own prejudices and insulate ourselves with comforting opinions that reaffirm our core beliefs. Crowds quickly become mobs. The justification for the Iraq war, the collapse of Enron, the explosion of the space shuttle Columbia--all of these resulted from decisions made by leaders and groups trapped in "information cocoons," shielded from information at odds with their preconceptions. How can leaders and ordinary people challenge insular decision making and gain access to the sum of human knowledge?

Stunning new ways to share and aggregate information, many Internet-based, are helping companies, schools, governments, and individuals not only to acquire, but also to create, ever-growing bodies of accurate knowledge. Through a ceaseless flurry of self-correcting exchanges, wikis, covering everything from politics and business plans to sports and science fiction subcultures, amass--and refine--information. Open-source software enables large numbers of people to participate in technological development. Prediction markets aggregate information in a way that allows companies, ranging from computer manufacturers to Hollywood studios, to make better decisions about product launches and office openings. Sunstein shows how people can assimilate aggregated information without succumbing to the dangers of the herd mentality--and when and why the new aggregation techniques are so astoundingly accurate.

In a world where opinion and anecdote increasingly compete on equal footing with hard evidence, the on-line effort of many minds coming together might well provide the best path to infotopia.