Making more money can make people happier, at least to some extent  But new research shows that the reverse is also true, and happy people earn more money
Researchers at the University of London studied more than 10,000 Americans and found that those who were emotionally positive and more satisfied with their lives growing up also earned higher incomes when they reached the age of 29
In addition to emotion, professionalism and ability to work also have a direct impact on income levels