The detailed comments of Ken Binmore, Jeroen Swinkels, and Eric van Damme on a draft of the book guided us to significantly improve the accuracy of the arguments and quality of the exposition. We are most grateful to them. We are grateful also to Haruo Imai, Jack Leach, Avner Shaked, Asher Wolinsky, John Wooders, and Junsen Zhang for providing valuable comments on several chapters. Ariel Rubinstein's long and fruitful collaboration with Asher Wolinsky was the origin of many of the ideas in this book, especially those in Part 2. Asher deserves not only our gratitude but also the credit for those ideas.