[Machine Translation] The author, who has steadily accumulated research results on cognitive biases, defies the accusations swirling around the old-fashioned economics community and proposes an epoch-making method (nudge) to reverse these findings and lead people to more rational behavior. How can behavioral economics, which has now been incorporated into the policies of Japan and other countries, change the world? This is a critically acclaimed nonfiction book that depicts the entire history of this controversial field of study with exceptional humor and storytelling.