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Happiness increases with salary until you hit $75,000 -- then, it flatlines.

Researchers from Princeton University analyzed 450,000 responses to the Gallup-Healthways Well-Being Index, which measures people's day-to-day level of happiness and overall life satisfaction. Respondents also report how much money they make.

The researchers were able to calculate that daily happiness increased until a person earned $75,000. Then money stopped making any difference on that front. (However, those who made more then $75,000 a year did see their overall sense of life satisfaction continue to rise with their salary.)

"Perhaps $75,000 is a threshold beyond which further increases in income no longer improve a person's ability to do what matters most to their emotional well-being -- such as spending time with the people they like, avoiding pain and disease, and enjoying leisure," the researchers concluded.

Of course, anyone who really thinks that making more than $75,000 can't make any difference in day-to-day happiness has never lived in an expensive city, like New York.