That's a good analysis. It looks like the stress of day-to-day life is most manageable at or above $75,000, but overall quality-of-life perception continues to

That's a good analysis. It looks like the stress of day-to-day life is most manageable at or above $75,000, but overall quality-of-life perception continues to grow forever. That's a reasonable conclusion. Intuitively, I would be more stressed by an unusually large gas bill, say, if I earned $30,000/year than I would be if I made $75,000/year. And at the same time, I would always be happier (feel cooler, more productive, more generous) if I had a bigger house, faster boat, or could give more to charity.