For the Third Edition, 2001 Nobel laureate Joseph Stiglitz joins forces with new co-author Carl Walsh, who brings both economic expertise and teaching savvy to the project. Together, Stiglitz and Walsh thoroughly integrate contemporary economics into the traditional curriculum. Informed by the broad range of research that earned Professor Stiglitz the Nobel Prize in Economic Sciences, the first edition of this text pioneered important topics relating to the economics of imperfect markets, which are today's standard in all principles texts. Only this text, however, gives those topics serious attention, with complete chapters on imperfect information in product markets, imperfections in labor markets, technological change, and environmental externalities, as well as a complete chapter on strategic behavior.