Do you think the economy is going to improve soon? The answer to that question could reveal much about not only your temperament but also the environment in which you grew up. A person's degree of optimism or pessimism affects everything from finances to marriages. In Saturday's New York Times, three personality and social psychologists – Martin Seligman from the University of Pennsylvania, Kate Sweeny from the University of California (Riverside), and Elizabeth Phelps from New York University – weigh in on optimism and its impacts.