In a 2018 paper published by Harvard Business School professor Michael Norton, researchers asked a group of millionaires (1) how happy they were on a scale of 1 to 10 and (2) how much more money they would need to get to a 10 on the happiness scale. Commenting on the results, Norton said, “All the way up the income-wealth spectrum basically everyone says [they’d need] two to three times as much.”[2]
