In a popular study by psychologist Daniel Kahneman and economist Angus Deaton, it was determined that the “magic income” is $75,000 a year. According to the study, as people earn more money, their day-to-day happiness (or “Emotional Well-Being”) rises. However, after $75,000, income becomes a plateau and more money has no measurable day-to-day contentment effect. They analyzed more than 450,000 total responses to Gallup weekly in households across 50 states in 2009. According to the United States Census Bureau, the mean household income that year was $67,976, 9.4% below the happiness threshold.