WE ALL KNOW THAT REGRET CAN MAKE PEOPLE MISERABLE, BUT regret also serves several important functions. First, anticipating that we may regret a decision may induce us to take the decision seriously and to imagine the various scenarios that may follow it. This anticipation may help us to see consequences of a decision that would not have been evident otherwise. Second, regret may emphasize the mistakes we made in arriving at a decision, so that, should a similar situation arise in the future, we won't make the same mistakes. Third, regret may mobilize or motivate us to take the actions necessary to undo a decision or ameliorate some of its unfortunate consequences.