Wishes and needs are endless, but resources are limited. That is what the economic theory points out. Notwithstanding, we cannot understand that as an assertion that correlates happiness and income directly. Undoubtedly, if a person is so poor that he lacks the basic items to survive, such as staple food, any income would increase significantly the happiness of the given individual. However, that increase in happiness wouldn't be as much if one has enough to survive and gets a promotion. Therefore, despite the fact that there is a relation between income and happiness, that relation is not continuous, that is, it is unlikely to grow at the same rate income raises.