 Killingsworth was part of a team of scientists, including the late psychologist Daniel Kahneman, who published a study challenging a famous 2010 paper by Kahneman and economist Angus Deaton that said happiness tends to go up with incomes until about $60,000 to $90,000 a year, at which point happiness flattens. Kahneman and Killingsworth reanalyzed that work and found that, in fact, the correlation between money and happiness extends much higher. So now you know. I'm Andrew O'Day, Bloomberg Radio.