This book would not have been available without the support of many of the staff at the Laboratory of the Center for Retrospective Research at Duke University. Your discernment, humor and patience have filled all the necessary gaps . Thank you for participating in our great experiment. We also thank everyone who helped to realize this project, especially Jim Levine, Amanda Moon, Laird Gallagher and Benjamin Rosenstock. Dan Ariely, Matt Trower . Adam, like all of us, is forced to make important decisions every day. And he's often wrong because it's not that easy. Should I lend to friends? What to choose as a reward at work: a bonus or a vacation in the Bahamas with payment of all expenses? Do I need to offer money for a friendly treat? In order not to look stupid, you need to understand where the line between market and social . Here Adam is immediately lost! The thing is that he does not understand at all how these two worlds are arranged . Dana - the best decision-making consultant - is in a hurry to help! He and his two assistants: the Fairy Market and the Fairy of the Society - will teach Adam to make the best, thoughtful and effective decisions .