Nouriel Roubini: Five Reasons for Economic Optimism… And five reasons why we should still be worried Beginning with the most positive aspects of the global market, world-renowned economist Nouriel Roubini lists the five reasons for economic optimism, as well as the five reasons why things could get worse. Discover the best and the worst of the global situation and the actions necessary to push the scale to strengthen the positives and resolve the negatives.