Happiness and the law. At first glance, these two concepts seem to have little to do with each other. To some, they may even seem diametrically opposed. Yet one of the things the law strives for is to improve people's quality of life. To do this, it must first predict what will make people happy. Yet happiness research shows that, time and time again, people err in predicting what will make them happy, overestimating the import of money and mistaking...