This is the original English version of Dan Ariely's "The Upside of Irrationality: The Unexpected Benefits of Defying Logic at Work and at Home." There are no noticeable stains on the inside pages, but there is a marker line on the inside cover. Please consider this a used book. - Title: The Upside of Irrationality - Author: Dan Ariely - Publisher: Harper Perennial - Genre: Business & Economics Foreign book Behavioral economics English book English English learning